Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar: "These were the main changes in this cycle: - More -rt motivated separation of CONFIG_PREEMPT and CONFIG_PREEMPTION. - Add more low level scheduling topology sanity checks and warnings to filter out nonsensical topologies that break scheduling. - Extend uclamp constraints to influence wakeup CPU placement - Make the RT scheduler more aware of asymmetric topologies and CPU capacities, via uclamp metrics, if CONFIG_UCLAMP_TASK=y - Make idle CPU selection more consistent - Various fixes, smaller cleanups, updates and enhancements - please see the git log for details" * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (58 commits) sched/fair: Define sched_idle_cpu() only for SMP configurations sched/topology: Assert non-NUMA topology masks don't (partially) overlap idle: fix spelling mistake "iterrupts" -> "interrupts" sched/fair: Remove redundant call to cpufreq_update_util() sched/psi: create /proc/pressure and /proc/pressure/{io|memory|cpu} only when psi enabled sched/fair: Fix sgc->{min,max}_capacity calculation for SD_OVERLAP sched/fair: calculate delta runnable load only when it's needed sched/cputime: move rq parameter in irqtime_account_process_tick stop_machine: Make stop_cpus() static sched/debug: Reset watchdog on all CPUs while processing sysrq-t sched/core: Fix size of rq::uclamp initialization sched/uclamp: Fix a bug in propagating uclamp value in new cgroups sched/fair: Load balance aggressively for SCHED_IDLE CPUs sched/fair : Improve update_sd_pick_busiest for spare capacity case watchdog: Remove soft_lockup_hrtimer_cnt and related code sched/rt: Make RT capacity-aware sched/fair: Make EAS wakeup placement consider uclamp restrictions sched/fair: Make task_fits_capacity() consider uclamp restrictions sched/uclamp: Rename uclamp_util_with() into uclamp_rq_util_with() sched/uclamp: Make uclamp util helpers use and return UL values ...
2020-01-28 10:07:09 -08:00 · 2020-01-28 10:07:09 -08:00 · c677124e63
commit c677124e63
parent c0e809e244 afa70d941f
72 changed files with 446 additions and 329 deletions
--- a/arch/arc/kernel/entry.S
+++ b/arch/arc/kernel/entry.S
@ -337,11 +337,11 @@ resume_user_mode_begin:
 resume_kernel_mode:

 	; Disable Interrupts from this point on
-	; CONFIG_PREEMPT: This is a must for preempt_schedule_irq()
-	; !CONFIG_PREEMPT: To ensure restore_regs is intr safe
+	; CONFIG_PREEMPTION: This is a must for preempt_schedule_irq()
+	; !CONFIG_PREEMPTION: To ensure restore_regs is intr safe
 	IRQ_DISABLE	r9

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION

 	; Can't preempt if preemption disabled
 	GET_CURR_THR_INFO_FROM_SP   r10
--- a/arch/arm/include/asm/switch_to.h
+++ b/arch/arm/include/asm/switch_to.h
@ -10,7 +10,7 @@
 * to ensure that the maintenance completes in case we migrate to another
 * CPU.
 */
-#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) && defined(CONFIG_CPU_V7)
+#if defined(CONFIG_PREEMPTION) && defined(CONFIG_SMP) && defined(CONFIG_CPU_V7)
 #define __complete_pending_tlbi()	dsb(ish)
 #else
 #define __complete_pending_tlbi()
--- a/arch/arm/kernel/entry-armv.S
+++ b/arch/arm/kernel/entry-armv.S
@ -211,7 +211,7 @@ __irq_svc:
 	svc_entry
 	irq_handler

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	ldr	r8, [tsk, #TI_PREEMPT]		@ get preempt count
 	ldr	r0, [tsk, #TI_FLAGS]		@ get flags
 	teq	r8, #0				@ if preempt count != 0
@ -226,7 +226,7 @@ ENDPROC(__irq_svc)

 	.ltorg

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 svc_preempt:
 	mov	r8, lr
 1:	bl	preempt_schedule_irq		@ irq en/disable is done inside
--- a/arch/arm/kernel/traps.c
+++ b/arch/arm/kernel/traps.c
@ -248,6 +248,8 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)

 #ifdef CONFIG_PREEMPT
 #define S_PREEMPT " PREEMPT"
+#elif defined(CONFIG_PREEMPT_RT)
+#define S_PREEMPT " PREEMPT_RT"
 #else
 #define S_PREEMPT ""
 #endif
--- a/arch/arm/mm/cache-v7.S
+++ b/arch/arm/mm/cache-v7.S
@ -135,13 +135,13 @@ flush_levels:
 	and	r1, r1, #7			@ mask of the bits for current cache only
 	cmp	r1, #2				@ see what cache we have at this level
 	blt	skip				@ skip if no cache, or just i-cache
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	save_and_disable_irqs_notrace r9	@ make cssr&csidr read atomic
 #endif
 	mcr	p15, 2, r10, c0, c0, 0		@ select current cache level in cssr
 	isb					@ isb to sych the new cssr&csidr
 	mrc	p15, 1, r1, c0, c0, 0		@ read the new csidr
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	restore_irqs_notrace r9
 #endif
 	and	r2, r1, #7			@ extract the length of the cache lines
--- a/arch/arm/mm/cache-v7m.S
+++ b/arch/arm/mm/cache-v7m.S
@ -183,13 +183,13 @@ flush_levels:
 	and	r1, r1, #7			@ mask of the bits for current cache only
 	cmp	r1, #2				@ see what cache we have at this level
 	blt	skip				@ skip if no cache, or just i-cache
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	save_and_disable_irqs_notrace r9	@ make cssr&csidr read atomic
 #endif
 	write_csselr r10, r1			@ set current cache level
 	isb					@ isb to sych the new cssr&csidr
 	read_ccsidr r1				@ read the new csidr
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	restore_irqs_notrace r9
 #endif
 	and	r2, r1, #7			@ extract the length of the cache lines
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@ -34,32 +34,32 @@ config ARM64
 	select ARCH_HAS_TEARDOWN_DMA_OPS if IOMMU_SUPPORT
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
-	select ARCH_INLINE_READ_LOCK if !PREEMPT
-	select ARCH_INLINE_READ_LOCK_BH if !PREEMPT
-	select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPT
-	select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPT
-	select ARCH_INLINE_READ_UNLOCK if !PREEMPT
-	select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPT
-	select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPT
-	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPT
-	select ARCH_INLINE_WRITE_LOCK if !PREEMPT
-	select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPT
-	select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPT
-	select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPT
-	select ARCH_INLINE_WRITE_UNLOCK if !PREEMPT
-	select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPT
-	select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPT
-	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPT
-	select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPT
-	select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPT
-	select ARCH_INLINE_SPIN_LOCK if !PREEMPT
-	select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPT
-	select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPT
-	select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPT
-	select ARCH_INLINE_SPIN_UNLOCK if !PREEMPT
-	select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPT
-	select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPT
-	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPT
+	select ARCH_INLINE_READ_LOCK if !PREEMPTION
+	select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
+	select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
+	select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
+	select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
+	select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
+	select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
+	select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
+	select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
+	select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
+	select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION
+	select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION
+	select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION
+	select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION
+	select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION
+	select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION
+	select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION
+	select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION
+	select ARCH_INLINE_SPIN_LOCK if !PREEMPTION
+	select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION
+	select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION
+	select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION
+	select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION
+	select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION
+	select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION
+	select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION
 	select ARCH_KEEP_MEMBLOCK
 	select ARCH_USE_CMPXCHG_LOCKREF
 	select ARCH_USE_QUEUED_RWLOCKS
--- a/arch/arm64/crypto/sha256-glue.c
+++ b/arch/arm64/crypto/sha256-glue.c
@ -97,7 +97,7 @@ static int sha256_update_neon(struct shash_desc *desc, const u8 *data,
 		 * input when running on a preemptible kernel, but process the
 		 * data block by block instead.
 		 */
-		if (IS_ENABLED(CONFIG_PREEMPT) &&
+		if (IS_ENABLED(CONFIG_PREEMPTION) &&
 		    chunk + sctx->count % SHA256_BLOCK_SIZE > SHA256_BLOCK_SIZE)
 			chunk = SHA256_BLOCK_SIZE -
 				sctx->count % SHA256_BLOCK_SIZE;
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@ -675,8 +675,8 @@ USER(\label, ic	ivau, \tmp2)			// invalidate I line PoU
 * where <label> is optional, and marks the point where execution will resume
 * after a yield has been performed. If omitted, execution resumes right after
 * the endif_yield_neon invocation. Note that the entire sequence, including
- * the provided patchup code, will be omitted from the image if CONFIG_PREEMPT
- * is not defined.
+ * the provided patchup code, will be omitted from the image if
+ * CONFIG_PREEMPTION is not defined.
 *
 * As a convenience, in the case where no patchup code is required, the above
 * sequence may be abbreviated to
@ -704,7 +704,7 @@ USER(\label, ic	ivau, \tmp2)			// invalidate I line PoU
 	.endm

 	.macro		if_will_cond_yield_neon
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	get_current_task	x0
 	ldr		x0, [x0, #TSK_TI_PREEMPT]
 	sub		x0, x0, #PREEMPT_DISABLE_OFFSET
--- a/arch/arm64/include/asm/preempt.h
+++ b/arch/arm64/include/asm/preempt.h
@ -79,11 +79,11 @@ static inline bool should_resched(int preempt_offset)
 	return pc == preempt_offset;
 }

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 void preempt_schedule(void);
 #define __preempt_schedule() preempt_schedule()
 void preempt_schedule_notrace(void);
 #define __preempt_schedule_notrace() preempt_schedule_notrace()
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */

 #endif /* __ASM_PREEMPT_H */
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@ -602,7 +602,7 @@ el1_irq:

 	irq_handler

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	ldr	x24, [tsk, #TSK_TI_PREEMPT]	// get preempt count
 alternative_if ARM64_HAS_IRQ_PRIO_MASKING
 	/*
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@ -144,9 +144,12 @@ void show_stack(struct task_struct *tsk, unsigned long *sp)

 #ifdef CONFIG_PREEMPT
 #define S_PREEMPT " PREEMPT"
+#elif defined(CONFIG_PREEMPT_RT)
+#define S_PREEMPT " PREEMPT_RT"
 #else
 #define S_PREEMPT ""
 #endif
+
 #define S_SMP " SMP"

 static int __die(const char *str, int err, struct pt_regs *regs)
--- a/arch/c6x/kernel/entry.S
+++ b/arch/c6x/kernel/entry.S
@ -18,7 +18,7 @@
 #define DP	B14
 #define SP	B15

-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 #define resume_kernel restore_all
 #endif

@ -287,7 +287,7 @@ work_notifysig:
 	;; is a little bit different
 	;;
 ENTRY(ret_from_exception)
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	MASK_INT B2
 #endif

@ -557,7 +557,7 @@ ENDPROC(_nmi_handler)
 	;;
 	;; Jump to schedule() then return to ret_from_isr
 	;;
-#ifdef	CONFIG_PREEMPT
+#ifdef	CONFIG_PREEMPTION
 resume_kernel:
 	GET_THREAD_INFO A12
 	LDW	.D1T1	*+A12(THREAD_INFO_PREEMPT_COUNT),A1
@ -582,7 +582,7 @@ preempt_schedule:
 	B	.S2	preempt_schedule_irq
 #endif
 	ADDKPC	.S2	preempt_schedule,B3,4
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */

 ENTRY(enable_exception)
 	DINT
--- a/arch/csky/kernel/entry.S
+++ b/arch/csky/kernel/entry.S
@ -277,7 +277,7 @@ ENTRY(csky_irq)
 	zero_fp
 	psrset	ee

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	mov	r9, sp			/* Get current stack  pointer */
 	bmaski	r10, THREAD_SHIFT
 	andn	r9, r10			/* Get thread_info */
@ -294,7 +294,7 @@ ENTRY(csky_irq)
 	mov	a0, sp
 	jbsr	csky_do_IRQ

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	subi	r12, 1
 	stw	r12, (r9, TINFO_PREEMPT)
 	cmpnei	r12, 0
--- a/arch/h8300/kernel/entry.S
+++ b/arch/h8300/kernel/entry.S
@ -284,12 +284,12 @@ badsys:
 	mov.l	er0,@(LER0:16,sp)
 	bra	resume_userspace

-#if !defined(CONFIG_PREEMPT)
+#if !defined(CONFIG_PREEMPTION)
 #define resume_kernel restore_all
 #endif

 ret_from_exception:
-#if defined(CONFIG_PREEMPT)
+#if defined(CONFIG_PREEMPTION)
 	orc	#0xc0,ccr
 #endif
 ret_from_interrupt:
@ -319,7 +319,7 @@ work_resched:
 restore_all:
 	RESTORE_ALL			/* Does RTE */

-#if defined(CONFIG_PREEMPT)
+#if defined(CONFIG_PREEMPTION)
 resume_kernel:
 	mov.l	@(TI_PRE_COUNT:16,er4),er0
 	bne	restore_all:8
--- a/arch/hexagon/kernel/vm_entry.S
+++ b/arch/hexagon/kernel/vm_entry.S
@ -265,12 +265,12 @@ event_dispatch:
 	 * should be in the designated register (usually R19)
 	 *
 	 * If we were in kernel mode, we don't need to check scheduler
-	 * or signals if CONFIG_PREEMPT is not set.  If set, then it has
+	 * or signals if CONFIG_PREEMPTION is not set.  If set, then it has
 	 * to jump to a need_resched kind of block.
-	 * BTW, CONFIG_PREEMPT is not supported yet.
+	 * BTW, CONFIG_PREEMPTION is not supported yet.
 	 */

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	R0 = #VM_INT_DISABLE
 	trap1(#HVM_TRAP1_VMSETIE)
 #endif
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@ -670,12 +670,12 @@ GLOBAL_ENTRY(ia64_leave_syscall)
 	 *
 	 * p6 controls whether current_thread_info()->flags needs to be check for
 	 * extra work.  We always check for extra work when returning to user-level.
-	 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
+	 * With CONFIG_PREEMPTION, we also check for extra work when the preempt_count
 	 * is 0.  After extra work processing has been completed, execution
 	 * resumes at ia64_work_processed_syscall with p6 set to 1 if the extra-work-check
 	 * needs to be redone.
 	 */
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	RSM_PSR_I(p0, r2, r18)			// disable interrupts
 	cmp.eq pLvSys,p0=r0,r0			// pLvSys=1: leave from syscall
 (pKStk) adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
@ -685,7 +685,7 @@ GLOBAL_ENTRY(ia64_leave_syscall)
 (pUStk)	mov r21=0			// r21 <- 0
 	;;
 	cmp.eq p6,p0=r21,r0		// p6 <- pUStk || (preempt_count == 0)
-#else /* !CONFIG_PREEMPT */
+#else /* !CONFIG_PREEMPTION */
 	RSM_PSR_I(pUStk, r2, r18)
 	cmp.eq pLvSys,p0=r0,r0		// pLvSys=1: leave from syscall
 (pUStk)	cmp.eq.unc p6,p0=r0,r0		// p6 <- pUStk
@ -814,12 +814,12 @@ GLOBAL_ENTRY(ia64_leave_kernel)
 	 *
 	 * p6 controls whether current_thread_info()->flags needs to be check for
 	 * extra work.  We always check for extra work when returning to user-level.
-	 * With CONFIG_PREEMPT, we also check for extra work when the preempt_count
+	 * With CONFIG_PREEMPTION, we also check for extra work when the preempt_count
 	 * is 0.  After extra work processing has been completed, execution
 	 * resumes at .work_processed_syscall with p6 set to 1 if the extra-work-check
 	 * needs to be redone.
 	 */
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	RSM_PSR_I(p0, r17, r31)			// disable interrupts
 	cmp.eq p0,pLvSys=r0,r0			// pLvSys=0: leave from kernel
 (pKStk)	adds r20=TI_PRE_COUNT+IA64_TASK_SIZE,r13
@ -1120,7 +1120,7 @@ skip_rbs_switch:

 	/*
 	 * On entry:
-	 *	r20 = &current->thread_info->pre_count (if CONFIG_PREEMPT)
+	 *	r20 = &current->thread_info->pre_count (if CONFIG_PREEMPTION)
 	 *	r31 = current->thread_info->flags
 	 * On exit:
 	 *	p6 = TRUE if work-pending-check needs to be redone
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@ -841,7 +841,7 @@ static int __kprobes pre_kprobes_handler(struct die_args *args)
 		return 1;
 	}

-#if !defined(CONFIG_PREEMPT)
+#if !defined(CONFIG_PREEMPTION)
 	if (p->ainsn.inst_flag == INST_FLAG_BOOSTABLE && !p->post_handler) {
 		/* Boost up -- we can execute copied instructions directly */
 		ia64_psr(regs)->ri = p->ainsn.slot;
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@ -728,7 +728,7 @@ no_intr_resched:
 	bri	6f;
 /* MS: Return to kernel state. */
 2:
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	lwi	r11, CURRENT_TASK, TS_THREAD_INFO;
 	/* MS: get preempt_count from thread info */
 	lwi	r5, r11, TI_PREEMPT_COUNT;
--- a/arch/mips/include/asm/asmmacro.h
+++ b/arch/mips/include/asm/asmmacro.h
@ -63,7 +63,7 @@
 	.endm

 	.macro	local_irq_disable reg=t0
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	lw      \reg, TI_PRE_COUNT($28)
 	addi    \reg, \reg, 1
 	sw      \reg, TI_PRE_COUNT($28)
@ -73,7 +73,7 @@
 	xori	\reg, \reg, 1
 	mtc0	\reg, CP0_STATUS
 	irq_disable_hazard
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	lw      \reg, TI_PRE_COUNT($28)
 	addi    \reg, \reg, -1
 	sw      \reg, TI_PRE_COUNT($28)
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@ -19,7 +19,7 @@
 #include <asm/thread_info.h>
 #include <asm/war.h>

-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 #define resume_kernel	restore_all
 #else
 #define __ret_from_irq	ret_from_exception
@ -27,7 +27,7 @@

 	.text
 	.align	5
-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 FEXPORT(ret_from_exception)
 	local_irq_disable			# preempt stop
 	b	__ret_from_irq
@ -53,7 +53,7 @@ resume_userspace:
 	bnez	t0, work_pending
 	j	restore_all

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 resume_kernel:
 	local_irq_disable
 	lw	t0, TI_PRE_COUNT($28)
--- a/arch/nds32/Kconfig
+++ b/arch/nds32/Kconfig
@ -62,7 +62,7 @@ config GENERIC_HWEIGHT

 config GENERIC_LOCKBREAK
 	def_bool y
-	depends on PREEMPT
+	depends on PREEMPTION

 config TRACE_IRQFLAGS_SUPPORT
 	def_bool y
--- a/arch/nds32/kernel/ex-exit.S
+++ b/arch/nds32/kernel/ex-exit.S
@ -72,7 +72,7 @@
 	restore_user_regs_last
 	.endm

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	.macro	preempt_stop
 	.endm
 #else
@ -158,7 +158,7 @@ no_work_pending:
 /*
 * preemptive kernel
 */
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 resume_kernel:
 	gie_disable
 	lwi	$t0, [tsk+#TSK_TI_PREEMPT]
--- a/arch/nios2/kernel/entry.S
+++ b/arch/nios2/kernel/entry.S
@ -365,7 +365,7 @@ ENTRY(ret_from_interrupt)
 	ldw	r1, PT_ESTATUS(sp)	/* check if returning to kernel */
 	TSTBNZ	r1, r1, ESTATUS_EU, Luser_return

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	GET_THREAD_INFO	r1
 	ldw	r4, TI_PREEMPT_COUNT(r1)
 	bne	r4, r0, restore_all
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@ -82,7 +82,7 @@ config STACK_GROWSUP
 config GENERIC_LOCKBREAK
 	bool
 	default y
-	depends on SMP && PREEMPT
+	depends on SMP && PREEMPTION

 config ARCH_HAS_ILOG2_U32
 	bool
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@ -940,14 +940,14 @@ intr_restore:
 	rfi
 	nop

-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION
 # define intr_do_preempt	intr_restore
-#endif /* !CONFIG_PREEMPT */
+#endif /* !CONFIG_PREEMPTION */

 	.import schedule,code
 intr_do_resched:
 	/* Only call schedule on return to userspace. If we're returning
-	 * to kernel space, we may schedule if CONFIG_PREEMPT, otherwise
+	 * to kernel space, we may schedule if CONFIG_PREEMPTION, otherwise
 	 * we jump back to intr_restore.
 	 */
 	LDREG	PT_IASQ0(%r16), %r20
@ -979,7 +979,7 @@ intr_do_resched:
 	 * and preempt_count is 0. otherwise, we continue on
 	 * our merry way back to the current running task.
 	 */
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	.import preempt_schedule_irq,code
 intr_do_preempt:
 	rsm	PSW_SM_I, %r0		/* disable interrupts */
@ -999,7 +999,7 @@ intr_do_preempt:
 	nop

 	b,n	intr_restore		/* ssm PSW_SM_I done by intr_restore */
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */

 	/*
 	 * External interrupts.
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@ -106,7 +106,7 @@ config LOCKDEP_SUPPORT
 config GENERIC_LOCKBREAK
 	bool
 	default y
-	depends on SMP && PREEMPT
+	depends on SMP && PREEMPTION

 config GENERIC_HWEIGHT
 	bool
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@ -897,7 +897,7 @@ resume_kernel:
 	bne-	0b
 1:

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	/* check current_thread_info->preempt_count */
 	lwz	r0,TI_PREEMPT(r2)
 	cmpwi	0,r0,0		/* if non-zero, just restore regs and return */
@ -921,7 +921,7 @@ resume_kernel:
 	 */
 	bl	trace_hardirqs_on
 #endif
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
 restore_kuap:
 	kuap_restore r1, r2, r9, r10, r0

--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@ -846,7 +846,7 @@ resume_kernel:
 	bne-	0b
 1:

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	/* Check if we need to preempt */
 	andi.	r0,r4,_TIF_NEED_RESCHED
 	beq+	restore
@ -877,7 +877,7 @@ resume_kernel:
 	li	r10,MSR_RI
 	mtmsrd	r10,1		  /* Update machine state */
 #endif /* CONFIG_PPC_BOOK3E */
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */

 	.globl	fast_exc_return_irq
 fast_exc_return_irq:
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@ -155,7 +155,7 @@ _save_context:
 	REG_L x2,  PT_SP(sp)
 	.endm

-#if !IS_ENABLED(CONFIG_PREEMPT)
+#if !IS_ENABLED(CONFIG_PREEMPTION)
 .set resume_kernel, restore_all
 #endif

@ -305,7 +305,7 @@ restore_all:
 	sret
 #endif

-#if IS_ENABLED(CONFIG_PREEMPT)
+#if IS_ENABLED(CONFIG_PREEMPTION)
 resume_kernel:
 	REG_L s0, TASK_TI_PREEMPT_COUNT(tp)
 	bnez s0, restore_all
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@ -30,7 +30,7 @@ config GENERIC_BUG_RELATIVE_POINTERS
 	def_bool y

 config GENERIC_LOCKBREAK
-	def_bool y if PREEMPT
+	def_bool y if PREEMPTTION

 config PGSTE
 	def_bool y if KVM
--- a/arch/s390/include/asm/preempt.h
+++ b/arch/s390/include/asm/preempt.h
@ -130,11 +130,11 @@ static inline bool should_resched(int preempt_offset)

 #endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 extern asmlinkage void preempt_schedule(void);
 #define __preempt_schedule() preempt_schedule()
 extern asmlinkage void preempt_schedule_notrace(void);
 #define __preempt_schedule_notrace() preempt_schedule_notrace()
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */

 #endif /* __ASM_PREEMPT_H */
--- a/arch/s390/kernel/dumpstack.c
+++ b/arch/s390/kernel/dumpstack.c
@ -195,6 +195,8 @@ void die(struct pt_regs *regs, const char *str)
 	       regs->int_code >> 17, ++die_counter);
 #ifdef CONFIG_PREEMPT
 	pr_cont("PREEMPT ");
+#elif defined(CONFIG_PREEMPT_RT)
+	pr_cont("PREEMPT_RT ");
 #endif
 	pr_cont("SMP ");
 	if (debug_pagealloc_enabled())
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@ -790,7 +790,7 @@ ENTRY(io_int_handler)
 .Lio_work:
 	tm	__PT_PSW+1(%r11),0x01	# returning to user ?
 	jo	.Lio_work_user		# yes -> do resched & signal
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	# check for preemptive scheduling
 	icm	%r0,15,__LC_PREEMPT_COUNT
 	jnz	.Lio_restore		# preemption is disabled
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@ -108,7 +108,7 @@ config GENERIC_CALIBRATE_DELAY

 config GENERIC_LOCKBREAK
 	def_bool y
-	depends on SMP && PREEMPT
+	depends on SMP && PREEMPTION

 config ARCH_SUSPEND_POSSIBLE
 	def_bool n
--- a/arch/sh/kernel/cpu/sh5/entry.S
+++ b/arch/sh/kernel/cpu/sh5/entry.S
@ -86,7 +86,7 @@
 	andi	r6, ~0xf0, r6;		\
 	putcon	r6, SR;

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 #  define preempt_stop()	CLI()
 #else
 #  define preempt_stop()
@ -884,7 +884,7 @@ ret_from_exception:

 	/* Check softirqs */

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	pta   ret_from_syscall, tr0
 	blink   tr0, ZERO

--- a/arch/sh/kernel/entry-common.S
+++ b/arch/sh/kernel/entry-common.S
@ -41,7 +41,7 @@
 */
 #include <asm/dwarf.h>

-#if defined(CONFIG_PREEMPT)
+#if defined(CONFIG_PREEMPTION)
 #  define preempt_stop()	cli ; TRACE_IRQS_OFF
 #else
 #  define preempt_stop()
@ -84,7 +84,7 @@ ENTRY(ret_from_irq)
 	get_current_thread_info r8, r0
 	bt	resume_kernel	! Yes, it's from kernel, go back soon

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	bra	resume_userspace
 	 nop
 ENTRY(resume_kernel)
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@ -277,7 +277,7 @@ config US3_MC
 config GENERIC_LOCKBREAK
 	bool
 	default y
-	depends on SPARC64 && SMP && PREEMPT
+	depends on SPARC64 && SMP && PREEMPTION

 config NUMA
 	bool "NUMA support"
--- a/arch/sparc/kernel/rtrap_64.S
+++ b/arch/sparc/kernel/rtrap_64.S
@ -310,7 +310,7 @@ kern_rtt_restore:
 		retry

 to_kernel:
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 		ldsw			[%g6 + TI_PRE_COUNT], %l5
 		brnz			%l5, kern_fpucheck
 		 ldx			[%g6 + TI_FLAGS], %l5
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@ -520,7 +520,7 @@ common_exception_return:
 	call4	schedule	# void schedule (void)
 	j	1b

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 6:
 	_bbci.l	a4, TIF_NEED_RESCHED, 4f

--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@ -519,12 +519,15 @@ DEFINE_SPINLOCK(die_lock);
 void die(const char * str, struct pt_regs * regs, long err)
 {
 	static int die_counter;
+	const char *pr = "";
+
+	if (IS_ENABLED(CONFIG_PREEMPTION))
+		pr = IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : " PREEMPT";

 	console_verbose();
 	spin_lock_irq(&die_lock);

-	pr_info("%s: sig: %ld [#%d]%s\n", str, err, ++die_counter,
-		IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "");
+	pr_info("%s: sig: %ld [#%d]%s\n", str, err, ++die_counter, pr);
 	show_regs(regs);
 	if (!user_mode(regs))
 		show_stack(NULL, (unsigned long*)regs->areg[1]);
--- a/drivers/xen/preempt.c
+++ b/drivers/xen/preempt.c
@ -8,7 +8,7 @@
 #include <linux/sched.h>
 #include <xen/xen-ops.h>

-#ifndef CONFIG_PREEMPT
+#ifndef CONFIG_PREEMPTION

 /*
 * Some hypercalls issued by the toolstack can take many 10s of
@ -37,4 +37,4 @@ asmlinkage __visible void xen_maybe_preempt_hcall(void)
 		__this_cpu_write(xen_in_preemptible_hcall, true);
 	}
 }
-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@ -168,7 +168,7 @@ btrfs_device_set_##name(struct btrfs_device *dev, u64 size)		\
 	write_seqcount_end(&dev->data_seqcount);			\
 	preempt_enable();						\
 }
-#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
 #define BTRFS_DEVICE_GETSET_FUNCS(name)					\
 static inline u64							\
 btrfs_device_get_##name(const struct btrfs_device *dev)			\
--- a/fs/stack.c
+++ b/fs/stack.c
@ -23,7 +23,7 @@ void fsstack_copy_inode_size(struct inode *dst, struct inode *src)

 	/*
 	 * But on 32-bit, we ought to make an effort to keep the two halves of
-	 * i_blocks in sync despite SMP or PREEMPT - though stat's
+	 * i_blocks in sync despite SMP or PREEMPTION - though stat's
 	 * generic_fillattr() doesn't bother, and we won't be applying quotas
 	 * (where i_blocks does become important) at the upper level.
 	 *
@ -38,14 +38,14 @@ void fsstack_copy_inode_size(struct inode *dst, struct inode *src)
 		spin_unlock(&src->i_lock);

 	/*
-	 * If CONFIG_SMP or CONFIG_PREEMPT on 32-bit, it's vital for
+	 * If CONFIG_SMP or CONFIG_PREEMPTION on 32-bit, it's vital for
 	 * fsstack_copy_inode_size() to hold some lock around
 	 * i_size_write(), otherwise i_size_read() may spin forever (see
 	 * include/linux/fs.h).  We don't necessarily hold i_mutex when this
 	 * is called, so take i_lock for that case.
 	 *
 	 * And if on 32-bit, continue our effort to keep the two halves of
-	 * i_blocks in sync despite SMP or PREEMPT: use i_lock  for that case
+	 * i_blocks in sync despite SMP or PREEMPTION: use i_lock for that case
 	 * too, and do both at once by combining the tests.
 	 *
 	 * There is none of this locking overhead in the 64-bit case.
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@ -855,7 +855,7 @@ static inline loff_t i_size_read(const struct inode *inode)
 		i_size = inode->i_size;
 	} while (read_seqcount_retry(&inode->i_size_seqcount, seq));
 	return i_size;
-#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
 	loff_t i_size;

 	preempt_disable();
@ -880,7 +880,7 @@ static inline void i_size_write(struct inode *inode, loff_t i_size)
 	inode->i_size = i_size;
 	write_seqcount_end(&inode->i_size_seqcount);
 	preempt_enable();
-#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
 	preempt_disable();
 	inode->i_size = i_size;
 	preempt_enable();
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@ -730,7 +730,7 @@ static inline void hd_free_part(struct hd_struct *part)
 * accessor function.
 *
 * Code written along the lines of i_size_read() and i_size_write().
- * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
+ * CONFIG_PREEMPTION case optimizes the case of UP kernel with preemption
 * on.
 */
 static inline sector_t part_nr_sects_read(struct hd_struct *part)
@ -743,7 +743,7 @@ static inline sector_t part_nr_sects_read(struct hd_struct *part)
 		nr_sects = part->nr_sects;
 	} while (read_seqcount_retry(&part->nr_sects_seq, seq));
 	return nr_sects;
-#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
 	sector_t nr_sects;

 	preempt_disable();
@ -766,7 +766,7 @@ static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
 	write_seqcount_begin(&part->nr_sects_seq);
 	part->nr_sects = size;
 	write_seqcount_end(&part->nr_sects_seq);
-#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPT)
+#elif BITS_PER_LONG==32 && defined(CONFIG_PREEMPTION)
 	preempt_disable();
 	part->nr_sects = size;
 	preempt_enable();
--- a/include/linux/sched/cpufreq.h
+++ b/include/linux/sched/cpufreq.h
@ -9,7 +9,6 @@
 */

 #define SCHED_CPUFREQ_IOWAIT	(1U << 0)
-#define SCHED_CPUFREQ_MIGRATION	(1U << 1)

 #ifdef CONFIG_CPU_FREQ
 struct cpufreq_policy;
--- a/include/linux/stop_machine.h
+++ b/include/linux/stop_machine.h
@ -32,8 +32,6 @@ int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn, void *arg);
 int stop_two_cpus(unsigned int cpu1, unsigned int cpu2, cpu_stop_fn_t fn, void *arg);
 bool stop_one_cpu_nowait(unsigned int cpu, cpu_stop_fn_t fn, void *arg,
 			 struct cpu_stop_work *work_buf);
-int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg);
-int try_stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg);
 void stop_machine_park(int cpu);
 void stop_machine_unpark(int cpu);
 void stop_machine_yield(const struct cpumask *cpumask);
@ -82,20 +80,6 @@ static inline bool stop_one_cpu_nowait(unsigned int cpu,
 	return false;
 }

-static inline int stop_cpus(const struct cpumask *cpumask,
-			    cpu_stop_fn_t fn, void *arg)
-{
-	if (cpumask_test_cpu(raw_smp_processor_id(), cpumask))
-		return stop_one_cpu(raw_smp_processor_id(), fn, arg);
-	return -ENOENT;
-}
-
-static inline int try_stop_cpus(const struct cpumask *cpumask,
-				cpu_stop_fn_t fn, void *arg)
-{
-	return stop_cpus(cpumask, fn, arg);
-}
-
 #endif	/* CONFIG_SMP */

 /*
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@ -215,7 +215,7 @@ bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
 void xen_efi_runtime_setup(void);


-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION

 static inline void xen_preemptible_hcall_begin(void)
 {
@ -239,6 +239,6 @@ static inline void xen_preemptible_hcall_end(void)
 	__this_cpu_write(xen_in_preemptible_hcall, false);
 }

-#endif /* CONFIG_PREEMPT */
+#endif /* CONFIG_PREEMPTION */

 #endif /* INCLUDE_XEN_OPS_H */
--- a/kernel/Kconfig.locks
+++ b/kernel/Kconfig.locks
@ -101,7 +101,7 @@ config UNINLINE_SPIN_UNLOCK
 # unlock and unlock_irq functions are inlined when:
 #   - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
 #  or
-#   - DEBUG_SPINLOCK=n and PREEMPT=n
+#   - DEBUG_SPINLOCK=n and PREEMPTION=n
 #
 # unlock_bh and unlock_irqrestore functions are inlined when:
 #   - DEBUG_SPINLOCK=n and ARCH_INLINE_*LOCK=y
@ -139,7 +139,7 @@ config INLINE_SPIN_UNLOCK_BH

 config INLINE_SPIN_UNLOCK_IRQ
 	def_bool y
-	depends on !PREEMPT || ARCH_INLINE_SPIN_UNLOCK_IRQ
+	depends on !PREEMPTION || ARCH_INLINE_SPIN_UNLOCK_IRQ

 config INLINE_SPIN_UNLOCK_IRQRESTORE
 	def_bool y
@ -168,7 +168,7 @@ config INLINE_READ_LOCK_IRQSAVE

 config INLINE_READ_UNLOCK
 	def_bool y
-	depends on !PREEMPT || ARCH_INLINE_READ_UNLOCK
+	depends on !PREEMPTION || ARCH_INLINE_READ_UNLOCK

 config INLINE_READ_UNLOCK_BH
 	def_bool y
@ -176,7 +176,7 @@ config INLINE_READ_UNLOCK_BH

 config INLINE_READ_UNLOCK_IRQ
 	def_bool y
-	depends on !PREEMPT || ARCH_INLINE_READ_UNLOCK_IRQ
+	depends on !PREEMPTION || ARCH_INLINE_READ_UNLOCK_IRQ

 config INLINE_READ_UNLOCK_IRQRESTORE
 	def_bool y
@ -205,7 +205,7 @@ config INLINE_WRITE_LOCK_IRQSAVE

 config INLINE_WRITE_UNLOCK
 	def_bool y
-	depends on !PREEMPT || ARCH_INLINE_WRITE_UNLOCK
+	depends on !PREEMPTION || ARCH_INLINE_WRITE_UNLOCK

 config INLINE_WRITE_UNLOCK_BH
 	def_bool y
@ -213,7 +213,7 @@ config INLINE_WRITE_UNLOCK_BH

 config INLINE_WRITE_UNLOCK_IRQ
 	def_bool y
-	depends on !PREEMPT || ARCH_INLINE_WRITE_UNLOCK_IRQ
+	depends on !PREEMPTION || ARCH_INLINE_WRITE_UNLOCK_IRQ

 config INLINE_WRITE_UNLOCK_IRQRESTORE
 	def_bool y
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@ -525,8 +525,7 @@ static int bringup_wait_for_ap(unsigned int cpu)
 	if (WARN_ON_ONCE((!cpu_online(cpu))))
 		return -ECANCELED;

-	/* Unpark the stopper thread and the hotplug thread of the target cpu */
-	stop_machine_unpark(cpu);
+	/* Unpark the hotplug thread of the target cpu */
 	kthread_unpark(st->thread);

 	/*
@ -1089,8 +1088,8 @@ void notify_cpu_starting(unsigned int cpu)

 /*
 * Called from the idle task. Wake up the controlling task which brings the
- * stopper and the hotplug thread of the upcoming CPU up and then delegates
- * the rest of the online bringup to the hotplug thread.
+ * hotplug thread of the upcoming CPU up and then delegates the rest of the
+ * online bringup to the hotplug thread.
 */
 void cpuhp_online_idle(enum cpuhp_state state)
 {
@ -1100,6 +1099,12 @@ void cpuhp_online_idle(enum cpuhp_state state)
 	if (state != CPUHP_AP_ONLINE_IDLE)
 		return;

+	/*
+	 * Unpart the stopper thread before we start the idle loop (and start
+	 * scheduling); this ensures the stopper task is always available.
+	 */
+	stop_machine_unpark(smp_processor_id());
+
 	st->state = CPUHP_AP_ONLINE_IDLE;
 	complete_ap_thread(st, true);
 }
--- a/kernel/sched/clock.c
+++ b/kernel/sched/clock.c
@ -370,7 +370,7 @@ u64 sched_clock_cpu(int cpu)
 	if (sched_clock_stable())
 		return sched_clock() + __sched_clock_offset;

-	if (!static_branch_unlikely(&sched_clock_running))
+	if (!static_branch_likely(&sched_clock_running))
 		return sched_clock();

 	preempt_disable_notrace();
@ -393,7 +393,7 @@ void sched_clock_tick(void)
 	if (sched_clock_stable())
 		return;

-	if (!static_branch_unlikely(&sched_clock_running))
+	if (!static_branch_likely(&sched_clock_running))
 		return;

 	lockdep_assert_irqs_disabled();
@ -460,7 +460,7 @@ void __init sched_clock_init(void)

 u64 sched_clock_cpu(int cpu)
 {
-	if (!static_branch_unlikely(&sched_clock_running))
+	if (!static_branch_likely(&sched_clock_running))
 		return 0;

 	return sched_clock();
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@ -919,17 +919,17 @@ uclamp_eff_get(struct task_struct *p, enum uclamp_id clamp_id)
 	return uc_req;
 }

-unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
+unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id)
 {
 	struct uclamp_se uc_eff;

 	/* Task currently refcounted: use back-annotated (effective) value */
 	if (p->uclamp[clamp_id].active)
-		return p->uclamp[clamp_id].value;
+		return (unsigned long)p->uclamp[clamp_id].value;

 	uc_eff = uclamp_eff_get(p, clamp_id);

-	return uc_eff.value;
+	return (unsigned long)uc_eff.value;
 }

 /*
@ -1253,7 +1253,8 @@ static void __init init_uclamp(void)
 	mutex_init(&uclamp_mutex);

 	for_each_possible_cpu(cpu) {
-		memset(&cpu_rq(cpu)->uclamp, 0, sizeof(struct uclamp_rq));
+		memset(&cpu_rq(cpu)->uclamp, 0,
+				sizeof(struct uclamp_rq)*UCLAMP_CNT);
 		cpu_rq(cpu)->uclamp_flags = 0;
 	}

@ -4504,7 +4505,7 @@ static inline int rt_effective_prio(struct task_struct *p, int prio)
 void set_user_nice(struct task_struct *p, long nice)
 {
 	bool queued, running;
-	int old_prio, delta;
+	int old_prio;
 	struct rq_flags rf;
 	struct rq *rq;

@ -4538,19 +4539,18 @@ void set_user_nice(struct task_struct *p, long nice)
 	set_load_weight(p, true);
 	old_prio = p->prio;
 	p->prio = effective_prio(p);
-	delta = p->prio - old_prio;

-	if (queued) {
+	if (queued)
 		enqueue_task(rq, p, ENQUEUE_RESTORE | ENQUEUE_NOCLOCK);
-		/*
-		 * If the task increased its priority or is running and
-		 * lowered its priority, then reschedule its CPU:
-		 */
-		if (delta < 0 || (delta > 0 && task_running(rq, p)))
-			resched_curr(rq);
-	}
 	if (running)
 		set_next_task(rq, p);
+
+	/*
+	 * If the task increased its priority or is running and
+	 * lowered its priority, then reschedule its CPU:
+	 */
+	p->sched_class->prio_changed(rq, p, old_prio);
+
 out_unlock:
 	task_rq_unlock(rq, p, &rf);
 }
@ -7100,6 +7100,12 @@ static int cpu_cgroup_css_online(struct cgroup_subsys_state *css)

 	if (parent)
 		sched_online_group(tg, parent);
+
+#ifdef CONFIG_UCLAMP_TASK_GROUP
+	/* Propagate the effective uclamp value for the new group */
+	cpu_util_update_eff(css);
+#endif
+
 	return 0;
 }

--- a/kernel/sched/cpufreq_schedutil.c
+++ b/kernel/sched/cpufreq_schedutil.c
@ -238,7 +238,7 @@ unsigned long schedutil_cpu_util(int cpu, unsigned long util_cfs,
 	 */
 	util = util_cfs + cpu_util_rt(rq);
 	if (type == FREQUENCY_UTIL)
-		util = uclamp_util_with(rq, util, p);
+		util = uclamp_rq_util_with(rq, util, p);

 	dl_util = cpu_util_dl(rq);

--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@ -46,6 +46,8 @@ static int convert_prio(int prio)
 * @cp: The cpupri context
 * @p: The task
 * @lowest_mask: A mask to fill in with selected CPUs (or NULL)
+ * @fitness_fn: A pointer to a function to do custom checks whether the CPU
+ *              fits a specific criteria so that we only return those CPUs.
 *
 * Note: This function returns the recommended CPUs as calculated during the
 * current invocation.  By the time the call returns, the CPUs may have in
@ -57,7 +59,8 @@ static int convert_prio(int prio)
 * Return: (int)bool - CPUs were found
 */
 int cpupri_find(struct cpupri *cp, struct task_struct *p,
-		struct cpumask *lowest_mask)
+		struct cpumask *lowest_mask,
+		bool (*fitness_fn)(struct task_struct *p, int cpu))
 {
 	int idx = 0;
 	int task_pri = convert_prio(p->prio);
@ -98,6 +101,8 @@ int cpupri_find(struct cpupri *cp, struct task_struct *p,
 			continue;

 		if (lowest_mask) {
+			int cpu;
+
 			cpumask_and(lowest_mask, p->cpus_ptr, vec->mask);

 			/*
@ -108,7 +113,23 @@ int cpupri_find(struct cpupri *cp, struct task_struct *p,
 			 * condition, simply act as though we never hit this
 			 * priority level and continue on.
 			 */
-			if (cpumask_any(lowest_mask) >= nr_cpu_ids)
+			if (cpumask_empty(lowest_mask))
+				continue;
+
+			if (!fitness_fn)
+				return 1;
+
+			/* Ensure the capacity of the CPUs fit the task */
+			for_each_cpu(cpu, lowest_mask) {
+				if (!fitness_fn(p, cpu))
+					cpumask_clear_cpu(cpu, lowest_mask);
+			}
+
+			/*
+			 * If no CPU at the current priority can fit the task
+			 * continue looking
+			 */
+			if (cpumask_empty(lowest_mask))
 				continue;
 		}

--- a/kernel/sched/cpupri.h
+++ b/kernel/sched/cpupri.h
@ -18,7 +18,9 @@ struct cpupri {
 };

 #ifdef CONFIG_SMP
-int  cpupri_find(struct cpupri *cp, struct task_struct *p, struct cpumask *lowest_mask);
+int  cpupri_find(struct cpupri *cp, struct task_struct *p,
+		 struct cpumask *lowest_mask,
+		 bool (*fitness_fn)(struct task_struct *p, int cpu));
 void cpupri_set(struct cpupri *cp, int cpu, int pri);
 int  cpupri_init(struct cpupri *cp);
 void cpupri_cleanup(struct cpupri *cp);
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@ -355,7 +355,7 @@ void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
 * softirq as those do not count in task exec_runtime any more.
 */
 static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
-					 struct rq *rq, int ticks)
+					 int ticks)
 {
 	u64 other, cputime = TICK_NSEC * ticks;

@ -381,7 +381,7 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,
 		account_system_index_time(p, cputime, CPUTIME_SOFTIRQ);
 	} else if (user_tick) {
 		account_user_time(p, cputime);
-	} else if (p == rq->idle) {
+	} else if (p == this_rq()->idle) {
 		account_idle_time(cputime);
 	} else if (p->flags & PF_VCPU) { /* System time or guest time */
 		account_guest_time(p, cputime);
@ -392,14 +392,12 @@ static void irqtime_account_process_tick(struct task_struct *p, int user_tick,

 static void irqtime_account_idle_ticks(int ticks)
 {
-	struct rq *rq = this_rq();
-
-	irqtime_account_process_tick(current, 0, rq, ticks);
+	irqtime_account_process_tick(current, 0, ticks);
 }
 #else /* CONFIG_IRQ_TIME_ACCOUNTING */
 static inline void irqtime_account_idle_ticks(int ticks) { }
 static inline void irqtime_account_process_tick(struct task_struct *p, int user_tick,
-						struct rq *rq, int nr_ticks) { }
+						int nr_ticks) { }
 #endif /* CONFIG_IRQ_TIME_ACCOUNTING */

 /*
@ -473,13 +471,12 @@ void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st)
 void account_process_tick(struct task_struct *p, int user_tick)
 {
 	u64 cputime, steal;
-	struct rq *rq = this_rq();

 	if (vtime_accounting_enabled_this_cpu())
 		return;

 	if (sched_clock_irqtime) {
-		irqtime_account_process_tick(p, user_tick, rq, 1);
+		irqtime_account_process_tick(p, user_tick, 1);
 		return;
 	}

@ -493,7 +490,7 @@ void account_process_tick(struct task_struct *p, int user_tick)

 	if (user_tick)
 		account_user_time(p, cputime);
-	else if ((p != rq->idle) || (irq_count() != HARDIRQ_OFFSET))
+	else if ((p != this_rq()->idle) || (irq_count() != HARDIRQ_OFFSET))
 		account_system_time(p, HARDIRQ_OFFSET, cputime);
 	else
 		account_idle_time(cputime);
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@ -751,9 +751,16 @@ void sysrq_sched_debug_show(void)
 	int cpu;

 	sched_debug_header(NULL);
-	for_each_online_cpu(cpu)
+	for_each_online_cpu(cpu) {
+		/*
+		 * Need to reset softlockup watchdogs on all CPUs, because
+		 * another CPU might be blocked waiting for us to process
+		 * an IPI or stop_machine.
+		 */
+		touch_nmi_watchdog();
+		touch_all_softlockup_watchdogs();
 		print_cpu(NULL, cpu);
-
+	}
 }

 /*
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@ -801,7 +801,7 @@ void post_init_entity_util_avg(struct task_struct *p)
 		 * For !fair tasks do:
 		 *
 		update_cfs_rq_load_avg(now, cfs_rq);
-		attach_entity_load_avg(cfs_rq, se, 0);
+		attach_entity_load_avg(cfs_rq, se);
 		switched_from_fair(rq, p);
 		 *
 		 * such that the next switched_to_fair() has the
@ -3114,7 +3114,7 @@ static inline void cfs_rq_util_change(struct cfs_rq *cfs_rq, int flags)
 {
 	struct rq *rq = rq_of(cfs_rq);

-	if (&rq->cfs == cfs_rq || (flags & SCHED_CPUFREQ_MIGRATION)) {
+	if (&rq->cfs == cfs_rq) {
 		/*
 		 * There are a few boundary cases this might miss but it should
 		 * get called often enough that that should (hopefully) not be
@ -3366,16 +3366,17 @@ update_tg_cfs_runnable(struct cfs_rq *cfs_rq, struct sched_entity *se, struct cf

 	runnable_load_sum = (s64)se_runnable(se) * runnable_sum;
 	runnable_load_avg = div_s64(runnable_load_sum, LOAD_AVG_MAX);
-	delta_sum = runnable_load_sum - se_weight(se) * se->avg.runnable_load_sum;
-	delta_avg = runnable_load_avg - se->avg.runnable_load_avg;
-
-	se->avg.runnable_load_sum = runnable_sum;
-	se->avg.runnable_load_avg = runnable_load_avg;

 	if (se->on_rq) {
+		delta_sum = runnable_load_sum -
+				se_weight(se) * se->avg.runnable_load_sum;
+		delta_avg = runnable_load_avg - se->avg.runnable_load_avg;
 		add_positive(&cfs_rq->avg.runnable_load_avg, delta_avg);
 		add_positive(&cfs_rq->avg.runnable_load_sum, delta_sum);
 	}
+
+	se->avg.runnable_load_sum = runnable_sum;
+	se->avg.runnable_load_avg = runnable_load_avg;
 }

 static inline void add_tg_cfs_propagate(struct cfs_rq *cfs_rq, long runnable_sum)
@ -3520,7 +3521,7 @@ update_cfs_rq_load_avg(u64 now, struct cfs_rq *cfs_rq)
 * Must call update_cfs_rq_load_avg() before this, since we rely on
 * cfs_rq->avg.last_update_time being current.
 */
-static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
+static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se)
 {
 	u32 divider = LOAD_AVG_MAX - 1024 + cfs_rq->avg.period_contrib;

@ -3556,7 +3557,7 @@ static void attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s

 	add_tg_cfs_propagate(cfs_rq, se->avg.load_sum);

-	cfs_rq_util_change(cfs_rq, flags);
+	cfs_rq_util_change(cfs_rq, 0);

 	trace_pelt_cfs_tp(cfs_rq);
 }
@ -3614,7 +3615,7 @@ static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
 		 *
 		 * IOW we're enqueueing a task on a new CPU.
 		 */
-		attach_entity_load_avg(cfs_rq, se, SCHED_CPUFREQ_MIGRATION);
+		attach_entity_load_avg(cfs_rq, se);
 		update_tg_load_avg(cfs_rq, 0);

 	} else if (decayed) {
@ -3711,6 +3712,20 @@ static inline unsigned long task_util_est(struct task_struct *p)
 	return max(task_util(p), _task_util_est(p));
 }

+#ifdef CONFIG_UCLAMP_TASK
+static inline unsigned long uclamp_task_util(struct task_struct *p)
+{
+	return clamp(task_util_est(p),
+		     uclamp_eff_value(p, UCLAMP_MIN),
+		     uclamp_eff_value(p, UCLAMP_MAX));
+}
+#else
+static inline unsigned long uclamp_task_util(struct task_struct *p)
+{
+	return task_util_est(p);
+}
+#endif
+
 static inline void util_est_enqueue(struct cfs_rq *cfs_rq,
 				    struct task_struct *p)
 {
@ -3822,7 +3837,7 @@ done:

 static inline int task_fits_capacity(struct task_struct *p, long capacity)
 {
-	return fits_capacity(task_util_est(p), capacity);
+	return fits_capacity(uclamp_task_util(p), capacity);
 }

 static inline void update_misfit_status(struct task_struct *p, struct rq *rq)
@ -3857,7 +3872,7 @@ static inline void update_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *s
 static inline void remove_entity_load_avg(struct sched_entity *se) {}

 static inline void
-attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) {}
+attach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}
 static inline void
 detach_entity_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) {}

@ -5196,6 +5211,20 @@ static inline void update_overutilized_status(struct rq *rq)
 static inline void update_overutilized_status(struct rq *rq) { }
 #endif

+/* Runqueue only has SCHED_IDLE tasks enqueued */
+static int sched_idle_rq(struct rq *rq)
+{
+	return unlikely(rq->nr_running == rq->cfs.idle_h_nr_running &&
+			rq->nr_running);
+}
+
+#ifdef CONFIG_SMP
+static int sched_idle_cpu(int cpu)
+{
+	return sched_idle_rq(cpu_rq(cpu));
+}
+#endif
+
 /*
 * The enqueue_task method is called before nr_running is
 * increased. Here we update the fair scheduling stats and
@ -5310,6 +5339,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	struct sched_entity *se = &p->se;
 	int task_sleep = flags & DEQUEUE_SLEEP;
 	int idle_h_nr_running = task_has_idle_policy(p);
+	bool was_sched_idle = sched_idle_rq(rq);

 	for_each_sched_entity(se) {
 		cfs_rq = cfs_rq_of(se);
@ -5356,6 +5386,10 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	if (!se)
 		sub_nr_running(rq, 1);

+	/* balance early to pull high priority tasks */
+	if (unlikely(!was_sched_idle && sched_idle_rq(rq)))
+		rq->next_balance = jiffies;
+
 	util_est_dequeue(&rq->cfs, p, task_sleep);
 	hrtick_update(rq);
 }
@ -5378,15 +5412,6 @@ static struct {

 #endif /* CONFIG_NO_HZ_COMMON */

-/* CPU only has SCHED_IDLE tasks enqueued */
-static int sched_idle_cpu(int cpu)
-{
-	struct rq *rq = cpu_rq(cpu);
-
-	return unlikely(rq->nr_running == rq->cfs.idle_h_nr_running &&
-			rq->nr_running);
-}
-
 static unsigned long cpu_load(struct rq *rq)
 {
 	return cfs_rq_load_avg(&rq->cfs);
@ -5588,7 +5613,7 @@ find_idlest_group_cpu(struct sched_group *group, struct task_struct *p, int this
 	unsigned int min_exit_latency = UINT_MAX;
 	u64 latest_idle_timestamp = 0;
 	int least_loaded_cpu = this_cpu;
-	int shallowest_idle_cpu = -1, si_cpu = -1;
+	int shallowest_idle_cpu = -1;
 	int i;

 	/* Check if we have any choice: */
@ -5597,6 +5622,9 @@ find_idlest_group_cpu(struct sched_group *group, struct task_struct *p, int this

 	/* Traverse only the allowed CPUs */
 	for_each_cpu_and(i, sched_group_span(group), p->cpus_ptr) {
+		if (sched_idle_cpu(i))
+			return i;
+
 		if (available_idle_cpu(i)) {
 			struct rq *rq = cpu_rq(i);
 			struct cpuidle_state *idle = idle_get_state(rq);
@ -5619,12 +5647,7 @@ find_idlest_group_cpu(struct sched_group *group, struct task_struct *p, int this
 				latest_idle_timestamp = rq->idle_stamp;
 				shallowest_idle_cpu = i;
 			}
-		} else if (shallowest_idle_cpu == -1 && si_cpu == -1) {
-			if (sched_idle_cpu(i)) {
-				si_cpu = i;
-				continue;
-			}
-
+		} else if (shallowest_idle_cpu == -1) {
 			load = cpu_load(cpu_rq(i));
 			if (load < min_load) {
 				min_load = load;
@ -5633,11 +5656,7 @@ find_idlest_group_cpu(struct sched_group *group, struct task_struct *p, int this
 		}
 	}

-	if (shallowest_idle_cpu != -1)
-		return shallowest_idle_cpu;
-	if (si_cpu != -1)
-		return si_cpu;
-	return least_loaded_cpu;
+	return shallowest_idle_cpu != -1 ? shallowest_idle_cpu : least_loaded_cpu;
 }

 static inline int find_idlest_cpu(struct sched_domain *sd, struct task_struct *p,
@ -5790,7 +5809,7 @@ static int select_idle_core(struct task_struct *p, struct sched_domain *sd, int
 */
 static int select_idle_smt(struct task_struct *p, int target)
 {
-	int cpu, si_cpu = -1;
+	int cpu;

 	if (!static_branch_likely(&sched_smt_present))
 		return -1;
@ -5798,13 +5817,11 @@ static int select_idle_smt(struct task_struct *p, int target)
 	for_each_cpu(cpu, cpu_smt_mask(target)) {
 		if (!cpumask_test_cpu(cpu, p->cpus_ptr))
 			continue;
-		if (available_idle_cpu(cpu))
+		if (available_idle_cpu(cpu) || sched_idle_cpu(cpu))
 			return cpu;
-		if (si_cpu == -1 && sched_idle_cpu(cpu))
-			si_cpu = cpu;
 	}

-	return si_cpu;
+	return -1;
 }

 #else /* CONFIG_SCHED_SMT */
@ -5828,12 +5845,13 @@ static inline int select_idle_smt(struct task_struct *p, int target)
 */
 static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int target)
 {
+	struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_idle_mask);
 	struct sched_domain *this_sd;
 	u64 avg_cost, avg_idle;
 	u64 time, cost;
 	s64 delta;
 	int this = smp_processor_id();
-	int cpu, nr = INT_MAX, si_cpu = -1;
+	int cpu, nr = INT_MAX;

 	this_sd = rcu_dereference(*this_cpu_ptr(&sd_llc));
 	if (!this_sd)
@ -5859,15 +5877,13 @@ static int select_idle_cpu(struct task_struct *p, struct sched_domain *sd, int t

 	time = cpu_clock(this);

-	for_each_cpu_wrap(cpu, sched_domain_span(sd), target) {
+	cpumask_and(cpus, sched_domain_span(sd), p->cpus_ptr);
+
+	for_each_cpu_wrap(cpu, cpus, target) {
 		if (!--nr)
-			return si_cpu;
-		if (!cpumask_test_cpu(cpu, p->cpus_ptr))
-			continue;
-		if (available_idle_cpu(cpu))
+			return -1;
+		if (available_idle_cpu(cpu) || sched_idle_cpu(cpu))
 			break;
-		if (si_cpu == -1 && sched_idle_cpu(cpu))
-			si_cpu = cpu;
 	}

 	time = cpu_clock(this) - time;
@ -6268,9 +6284,18 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu)
 			if (!cpumask_test_cpu(cpu, p->cpus_ptr))
 				continue;

-			/* Skip CPUs that will be overutilized. */
 			util = cpu_util_next(cpu, p, cpu);
 			cpu_cap = capacity_of(cpu);
+			spare_cap = cpu_cap - util;
+
+			/*
+			 * Skip CPUs that cannot satisfy the capacity request.
+			 * IOW, placing the task there would make the CPU
+			 * overutilized. Take uclamp into account to see how
+			 * much capacity we can get out of the CPU; this is
+			 * aligned with schedutil_cpu_util().
+			 */
+			util = uclamp_rq_util_with(cpu_rq(cpu), util, p);
 			if (!fits_capacity(util, cpu_cap))
 				continue;

@ -6285,7 +6310,6 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu)
 			 * Find the CPU with the maximum spare capacity in
 			 * the performance domain
 			 */
-			spare_cap = cpu_cap - util;
 			if (spare_cap > max_spare_cap) {
 				max_spare_cap = spare_cap;
 				max_spare_cap_cpu = cpu;
@ -7780,29 +7804,11 @@ void update_group_capacity(struct sched_domain *sd, int cpu)
 		 */

 		for_each_cpu(cpu, sched_group_span(sdg)) {
-			struct sched_group_capacity *sgc;
-			struct rq *rq = cpu_rq(cpu);
+			unsigned long cpu_cap = capacity_of(cpu);

-			/*
-			 * build_sched_domains() -> init_sched_groups_capacity()
-			 * gets here before we've attached the domains to the
-			 * runqueues.
-			 *
-			 * Use capacity_of(), which is set irrespective of domains
-			 * in update_cpu_capacity().
-			 *
-			 * This avoids capacity from being 0 and
-			 * causing divide-by-zero issues on boot.
-			 */
-			if (unlikely(!rq->sd)) {
-				capacity += capacity_of(cpu);
-			} else {
-				sgc = rq->sd->groups->sgc;
-				capacity += sgc->capacity;
-			}
-
-			min_capacity = min(capacity, min_capacity);
-			max_capacity = max(capacity, max_capacity);
+			capacity += cpu_cap;
+			min_capacity = min(cpu_cap, min_capacity);
+			max_capacity = max(cpu_cap, max_capacity);
 		}
 	} else  {
 		/*
@ -8168,14 +8174,18 @@ static bool update_sd_pick_busiest(struct lb_env *env,

 	case group_has_spare:
 		/*
-		 * Select not overloaded group with lowest number of
-		 * idle cpus. We could also compare the spare capacity
-		 * which is more stable but it can end up that the
-		 * group has less spare capacity but finally more idle
+		 * Select not overloaded group with lowest number of idle cpus
+		 * and highest number of running tasks. We could also compare
+		 * the spare capacity which is more stable but it can end up
+		 * that the group has less spare capacity but finally more idle
 		 * CPUs which means less opportunity to pull tasks.
 		 */
-		if (sgs->idle_cpus >= busiest->idle_cpus)
+		if (sgs->idle_cpus > busiest->idle_cpus)
 			return false;
+		else if ((sgs->idle_cpus == busiest->idle_cpus) &&
+			 (sgs->sum_nr_running <= busiest->sum_nr_running))
+			return false;
+
 		break;
 	}

@ -9529,6 +9539,7 @@ static void rebalance_domains(struct rq *rq, enum cpu_idle_type idle)
 {
 	int continue_balancing = 1;
 	int cpu = rq->cpu;
+	int busy = idle != CPU_IDLE && !sched_idle_cpu(cpu);
 	unsigned long interval;
 	struct sched_domain *sd;
 	/* Earliest time when we have to do rebalance again */
@ -9565,7 +9576,7 @@ static void rebalance_domains(struct rq *rq, enum cpu_idle_type idle)
 			break;
 		}

-		interval = get_sd_balance_interval(sd, idle != CPU_IDLE);
+		interval = get_sd_balance_interval(sd, busy);

 		need_serialize = sd->flags & SD_SERIALIZE;
 		if (need_serialize) {
@ -9581,9 +9592,10 @@ static void rebalance_domains(struct rq *rq, enum cpu_idle_type idle)
 				 * state even if we migrated tasks. Update it.
 				 */
 				idle = idle_cpu(cpu) ? CPU_IDLE : CPU_NOT_IDLE;
+				busy = idle != CPU_IDLE && !sched_idle_cpu(cpu);
 			}
 			sd->last_balance = jiffies;
-			interval = get_sd_balance_interval(sd, idle != CPU_IDLE);
+			interval = get_sd_balance_interval(sd, busy);
 		}
 		if (need_serialize)
 			spin_unlock(&balancing);
@ -10333,6 +10345,9 @@ prio_changed_fair(struct rq *rq, struct task_struct *p, int oldprio)
 	if (!task_on_rq_queued(p))
 		return;

+	if (rq->cfs.nr_running == 1)
+		return;
+
 	/*
 	 * Reschedule if we are currently running on this runqueue and
 	 * our priority decreased, or if we are not currently running on
@ -10423,7 +10438,7 @@ static void attach_entity_cfs_rq(struct sched_entity *se)

 	/* Synchronize entity with its cfs_rq */
 	update_load_avg(cfs_rq, se, sched_feat(ATTACH_AGE_LOAD) ? 0 : SKIP_AGE_LOAD);
-	attach_entity_load_avg(cfs_rq, se, 0);
+	attach_entity_load_avg(cfs_rq, se);
 	update_tg_load_avg(cfs_rq, false);
 	propagate_entity_cfs_rq(se);
 }
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@ -158,7 +158,7 @@ static void cpuidle_idle_call(void)
 	/*
 	 * Suspend-to-idle ("s2idle") is a system state in which all user space
 	 * has been frozen, all I/O devices have been suspended and the only
-	 * activity happens here and in iterrupts (if any).  In that case bypass
+	 * activity happens here and in interrupts (if any). In that case bypass
 	 * the cpuidle governor and go stratight for the deepest idle state
 	 * available.  Possibly also suspend the local tick and the entire
 	 * timekeeping to prevent timer interrupts from kicking us out of idle
--- a/kernel/sched/pelt.c
+++ b/kernel/sched/pelt.c
@ -129,8 +129,20 @@ accumulate_sum(u64 delta, struct sched_avg *sa,
 		 * Step 2
 		 */
 		delta %= 1024;
-		contrib = __accumulate_pelt_segments(periods,
-				1024 - sa->period_contrib, delta);
+		if (load) {
+			/*
+			 * This relies on the:
+			 *
+			 * if (!load)
+			 *	runnable = running = 0;
+			 *
+			 * clause from ___update_load_sum(); this results in
+			 * the below usage of @contrib to dissapear entirely,
+			 * so no point in calculating it.
+			 */
+			contrib = __accumulate_pelt_segments(periods,
+					1024 - sa->period_contrib, delta);
+		}
 	}
 	sa->period_contrib = delta;

@ -205,7 +217,9 @@ ___update_load_sum(u64 now, struct sched_avg *sa,
 	 * This means that weight will be 0 but not running for a sched_entity
 	 * but also for a cfs_rq if the latter becomes idle. As an example,
 	 * this happens during idle_balance() which calls
-	 * update_blocked_averages()
+	 * update_blocked_averages().
+	 *
+	 * Also see the comment in accumulate_sum().
 	 */
 	if (!load)
 		runnable = running = 0;
--- a/kernel/sched/psi.c
+++ b/kernel/sched/psi.c
@ -1280,10 +1280,12 @@ static const struct file_operations psi_cpu_fops = {

 static int __init psi_proc_init(void)
 {
-	proc_mkdir("pressure", NULL);
-	proc_create("pressure/io", 0, NULL, &psi_io_fops);
-	proc_create("pressure/memory", 0, NULL, &psi_memory_fops);
-	proc_create("pressure/cpu", 0, NULL, &psi_cpu_fops);
+	if (psi_enable) {
+		proc_mkdir("pressure", NULL);
+		proc_create("pressure/io", 0, NULL, &psi_io_fops);
+		proc_create("pressure/memory", 0, NULL, &psi_memory_fops);
+		proc_create("pressure/cpu", 0, NULL, &psi_cpu_fops);
+	}
 	return 0;
 }
 module_init(psi_proc_init);
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@ -437,6 +437,45 @@ static inline int on_rt_rq(struct sched_rt_entity *rt_se)
 	return rt_se->on_rq;
 }

+#ifdef CONFIG_UCLAMP_TASK
+/*
+ * Verify the fitness of task @p to run on @cpu taking into account the uclamp
+ * settings.
+ *
+ * This check is only important for heterogeneous systems where uclamp_min value
+ * is higher than the capacity of a @cpu. For non-heterogeneous system this
+ * function will always return true.
+ *
+ * The function will return true if the capacity of the @cpu is >= the
+ * uclamp_min and false otherwise.
+ *
+ * Note that uclamp_min will be clamped to uclamp_max if uclamp_min
+ * > uclamp_max.
+ */
+static inline bool rt_task_fits_capacity(struct task_struct *p, int cpu)
+{
+	unsigned int min_cap;
+	unsigned int max_cap;
+	unsigned int cpu_cap;
+
+	/* Only heterogeneous systems can benefit from this check */
+	if (!static_branch_unlikely(&sched_asym_cpucapacity))
+		return true;
+
+	min_cap = uclamp_eff_value(p, UCLAMP_MIN);
+	max_cap = uclamp_eff_value(p, UCLAMP_MAX);
+
+	cpu_cap = capacity_orig_of(cpu);
+
+	return cpu_cap >= min(min_cap, max_cap);
+}
+#else
+static inline bool rt_task_fits_capacity(struct task_struct *p, int cpu)
+{
+	return true;
+}
+#endif
+
 #ifdef CONFIG_RT_GROUP_SCHED

 static inline u64 sched_rt_runtime(struct rt_rq *rt_rq)
@ -1391,6 +1430,7 @@ select_task_rq_rt(struct task_struct *p, int cpu, int sd_flag, int flags)
 {
 	struct task_struct *curr;
 	struct rq *rq;
+	bool test;

 	/* For anything but wake ups, just return the task_cpu */
 	if (sd_flag != SD_BALANCE_WAKE && sd_flag != SD_BALANCE_FORK)
@ -1422,10 +1462,16 @@ select_task_rq_rt(struct task_struct *p, int cpu, int sd_flag, int flags)
 	 *
 	 * This test is optimistic, if we get it wrong the load-balancer
 	 * will have to sort it out.
+	 *
+	 * We take into account the capacity of the CPU to ensure it fits the
+	 * requirement of the task - which is only important on heterogeneous
+	 * systems like big.LITTLE.
 	 */
-	if (curr && unlikely(rt_task(curr)) &&
-	    (curr->nr_cpus_allowed < 2 ||
-	     curr->prio <= p->prio)) {
+	test = curr &&
+	       unlikely(rt_task(curr)) &&
+	       (curr->nr_cpus_allowed < 2 || curr->prio <= p->prio);
+
+	if (test || !rt_task_fits_capacity(p, cpu)) {
 		int target = find_lowest_rq(p);

 		/*
@ -1449,15 +1495,15 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
 	 * let's hope p can move out.
 	 */
 	if (rq->curr->nr_cpus_allowed == 1 ||
-	    !cpupri_find(&rq->rd->cpupri, rq->curr, NULL))
+	    !cpupri_find(&rq->rd->cpupri, rq->curr, NULL, NULL))
 		return;

 	/*
 	 * p is migratable, so let's not schedule it and
 	 * see if it is pushed or pulled somewhere else.
 	 */
-	if (p->nr_cpus_allowed != 1
-	    && cpupri_find(&rq->rd->cpupri, p, NULL))
+	if (p->nr_cpus_allowed != 1 &&
+	    cpupri_find(&rq->rd->cpupri, p, NULL, NULL))
 		return;

 	/*
@ -1601,7 +1647,8 @@ static void put_prev_task_rt(struct rq *rq, struct task_struct *p)
 static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
 {
 	if (!task_running(rq, p) &&
-	    cpumask_test_cpu(cpu, p->cpus_ptr))
+	    cpumask_test_cpu(cpu, p->cpus_ptr) &&
+	    rt_task_fits_capacity(p, cpu))
 		return 1;

 	return 0;
@ -1643,7 +1690,8 @@ static int find_lowest_rq(struct task_struct *task)
 	if (task->nr_cpus_allowed == 1)
 		return -1; /* No other targets possible */

-	if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask))
+	if (!cpupri_find(&task_rq(task)->rd->cpupri, task, lowest_mask,
+			 rt_task_fits_capacity))
 		return -1; /* No targets found */

 	/*
@ -2147,12 +2195,14 @@ skip:
 */
 static void task_woken_rt(struct rq *rq, struct task_struct *p)
 {
-	if (!task_running(rq, p) &&
-	    !test_tsk_need_resched(rq->curr) &&
-	    p->nr_cpus_allowed > 1 &&
-	    (dl_task(rq->curr) || rt_task(rq->curr)) &&
-	    (rq->curr->nr_cpus_allowed < 2 ||
-	     rq->curr->prio <= p->prio))
+	bool need_to_push = !task_running(rq, p) &&
+			    !test_tsk_need_resched(rq->curr) &&
+			    p->nr_cpus_allowed > 1 &&
+			    (dl_task(rq->curr) || rt_task(rq->curr)) &&
+			    (rq->curr->nr_cpus_allowed < 2 ||
+			     rq->curr->prio <= p->prio);
+
+	if (need_to_push || !rt_task_fits_capacity(p, cpu_of(rq)))
 		push_rt_tasks(rq);
 }

@ -2224,7 +2274,10 @@ static void switched_to_rt(struct rq *rq, struct task_struct *p)
 	 */
 	if (task_on_rq_queued(p) && rq->curr != p) {
 #ifdef CONFIG_SMP
-		if (p->nr_cpus_allowed > 1 && rq->rt.overloaded)
+		bool need_to_push = rq->rt.overloaded ||
+				    !rt_task_fits_capacity(p, cpu_of(rq));
+
+		if (p->nr_cpus_allowed > 1 && need_to_push)
 			rt_queue_push_tasks(rq);
 #endif /* CONFIG_SMP */
 		if (p->prio < rq->curr->prio && cpu_online(cpu_of(rq)))
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@ -2300,14 +2300,14 @@ static inline void cpufreq_update_util(struct rq *rq, unsigned int flags) {}
 #endif /* CONFIG_CPU_FREQ */

 #ifdef CONFIG_UCLAMP_TASK
-unsigned int uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);
+unsigned long uclamp_eff_value(struct task_struct *p, enum uclamp_id clamp_id);

 static __always_inline
-unsigned int uclamp_util_with(struct rq *rq, unsigned int util,
-			      struct task_struct *p)
+unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util,
+				  struct task_struct *p)
 {
-	unsigned int min_util = READ_ONCE(rq->uclamp[UCLAMP_MIN].value);
-	unsigned int max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);
+	unsigned long min_util = READ_ONCE(rq->uclamp[UCLAMP_MIN].value);
+	unsigned long max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value);

 	if (p) {
 		min_util = max(min_util, uclamp_eff_value(p, UCLAMP_MIN));
@ -2324,18 +2324,10 @@ unsigned int uclamp_util_with(struct rq *rq, unsigned int util,

 	return clamp(util, min_util, max_util);
 }
-
-static inline unsigned int uclamp_util(struct rq *rq, unsigned int util)
-{
-	return uclamp_util_with(rq, util, NULL);
-}
 #else /* CONFIG_UCLAMP_TASK */
-static inline unsigned int uclamp_util_with(struct rq *rq, unsigned int util,
-					    struct task_struct *p)
-{
-	return util;
-}
-static inline unsigned int uclamp_util(struct rq *rq, unsigned int util)
+static inline
+unsigned long uclamp_rq_util_with(struct rq *rq, unsigned long util,
+				  struct task_struct *p)
 {
 	return util;
 }
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@ -1879,6 +1879,42 @@ static struct sched_domain *build_sched_domain(struct sched_domain_topology_leve
 	return sd;
 }

+/*
+ * Ensure topology masks are sane, i.e. there are no conflicts (overlaps) for
+ * any two given CPUs at this (non-NUMA) topology level.
+ */
+static bool topology_span_sane(struct sched_domain_topology_level *tl,
+			      const struct cpumask *cpu_map, int cpu)
+{
+	int i;
+
+	/* NUMA levels are allowed to overlap */
+	if (tl->flags & SDTL_OVERLAP)
+		return true;
+
+	/*
+	 * Non-NUMA levels cannot partially overlap - they must be either
+	 * completely equal or completely disjoint. Otherwise we can end up
+	 * breaking the sched_group lists - i.e. a later get_group() pass
+	 * breaks the linking done for an earlier span.
+	 */
+	for_each_cpu(i, cpu_map) {
+		if (i == cpu)
+			continue;
+		/*
+		 * We should 'and' all those masks with 'cpu_map' to exactly
+		 * match the topology we're about to build, but that can only
+		 * remove CPUs, which only lessens our ability to detect
+		 * overlaps
+		 */
+		if (!cpumask_equal(tl->mask(cpu), tl->mask(i)) &&
+		    cpumask_intersects(tl->mask(cpu), tl->mask(i)))
+			return false;
+	}
+
+	return true;
+}
+
 /*
 * Find the sched_domain_topology_level where all CPU capacities are visible
 * for all CPUs.
@ -1975,6 +2011,9 @@ build_sched_domains(const struct cpumask *cpu_map, struct sched_domain_attr *att
 				has_asym = true;
 			}

+			if (WARN_ON(!topology_span_sane(tl, cpu_map, i)))
+				goto error;
+
 			sd = build_sched_domain(tl, cpu_map, attr, sd, dflags, i);

 			if (tl == sched_domain_topology)
--- a/kernel/sched/wait_bit.c
+++ b/kernel/sched/wait_bit.c
@ -179,6 +179,7 @@ void init_wait_var_entry(struct wait_bit_queue_entry *wbq_entry, void *var, int
 			.bit_nr = -1,
 		},
 		.wq_entry = {
+			.flags	 = flags,
 			.private = current,
 			.func	 = var_wake_function,
 			.entry	 = LIST_HEAD_INIT(wbq_entry->wq_entry.entry),
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@ -442,7 +442,7 @@ static int __stop_cpus(const struct cpumask *cpumask,
 * @cpumask were offline; otherwise, 0 if all executions of @fn
 * returned 0, any non zero return value if any returned non zero.
 */
-int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
+static int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
 {
 	int ret;

@ -453,36 +453,6 @@ int stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
 	return ret;
 }

-/**
- * try_stop_cpus - try to stop multiple cpus
- * @cpumask: cpus to stop
- * @fn: function to execute
- * @arg: argument to @fn
- *
- * Identical to stop_cpus() except that it fails with -EAGAIN if
- * someone else is already using the facility.
- *
- * CONTEXT:
- * Might sleep.
- *
- * RETURNS:
- * -EAGAIN if someone else is already stopping cpus, -ENOENT if
- * @fn(@arg) was not executed at all because all cpus in @cpumask were
- * offline; otherwise, 0 if all executions of @fn returned 0, any non
- * zero return value if any returned non zero.
- */
-int try_stop_cpus(const struct cpumask *cpumask, cpu_stop_fn_t fn, void *arg)
-{
-	int ret;
-
-	/* static works are used, process one request at a time */
-	if (!mutex_trylock(&stop_cpus_mutex))
-		return -EAGAIN;
-	ret = __stop_cpus(cpumask, fn, arg);
-	mutex_unlock(&stop_cpus_mutex);
-	return ret;
-}
-
 static int cpu_stop_should_run(unsigned int cpu)
 {
 	struct cpu_stopper *stopper = &per_cpu(cpu_stopper, cpu);
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@ -2280,7 +2280,7 @@ __acquires(&pool->lock)
 	}

 	/*
-	 * The following prevents a kworker from hogging CPU on !PREEMPT
+	 * The following prevents a kworker from hogging CPU on !PREEMPTION
 	 * kernels, where a requeueing work item waiting for something to
 	 * happen could deadlock with stop_machine as such work item could
 	 * indefinitely requeue itself while all other CPUs are trapped in
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@ -1025,7 +1025,7 @@ config DEBUG_TIMEKEEPING

 config DEBUG_PREEMPT
 	bool "Debug preemptible kernel"
-	depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
+	depends on DEBUG_KERNEL && PREEMPTION && TRACE_IRQFLAGS_SUPPORT
 	default y
 	help
 	  If you say Y here then the kernel will use a debug variant of the
--- a/mm/memory.c
+++ b/mm/memory.c
@ -2203,7 +2203,7 @@ static inline int pte_unmap_same(struct mm_struct *mm, pmd_t *pmd,
 				pte_t *page_table, pte_t orig_pte)
 {
 	int same = 1;
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
+#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPTION)
 	if (sizeof(pte_t) > sizeof(unsigned long)) {
 		spinlock_t *ptl = pte_lockptr(mm, pmd);
 		spin_lock(ptl);
--- a/mm/slub.c
+++ b/mm/slub.c
@ -1964,7 +1964,7 @@ static void *get_partial(struct kmem_cache *s, gfp_t flags, int node,
 	return get_any_partial(s, flags, c);
 }

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 /*
 * Calculate the next globally unique transaction for disambiguiation
 * during cmpxchg. The transactions start with the cpu number and are then
@ -2009,7 +2009,7 @@ static inline void note_cmpxchg_failure(const char *n,

 	pr_info("%s %s: cmpxchg redo ", n, s->name);

-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	if (tid_to_cpu(tid) != tid_to_cpu(actual_tid))
 		pr_warn("due to cpu change %d -> %d\n",
 			tid_to_cpu(tid), tid_to_cpu(actual_tid));
@ -2637,7 +2637,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
 	unsigned long flags;

 	local_irq_save(flags);
-#ifdef CONFIG_PREEMPT
+#ifdef CONFIG_PREEMPTION
 	/*
 	 * We may have been preempted and rescheduled on a different
 	 * cpu before disabling interrupts. Need to reload cpu area
@ -2691,13 +2691,13 @@ redo:
 	 * as we end up on the original cpu again when doing the cmpxchg.
 	 *
 	 * We should guarantee that tid and kmem_cache are retrieved on
-	 * the same cpu. It could be different if CONFIG_PREEMPT so we need
+	 * the same cpu. It could be different if CONFIG_PREEMPTION so we need
 	 * to check if it is matched or not.
 	 */
 	do {
 		tid = this_cpu_read(s->cpu_slab->tid);
 		c = raw_cpu_ptr(s->cpu_slab);
-	} while (IS_ENABLED(CONFIG_PREEMPT) &&
+	} while (IS_ENABLED(CONFIG_PREEMPTION) &&
 		 unlikely(tid != READ_ONCE(c->tid)));

 	/*
@ -2971,7 +2971,7 @@ redo:
 	do {
 		tid = this_cpu_read(s->cpu_slab->tid);
 		c = raw_cpu_ptr(s->cpu_slab);
-	} while (IS_ENABLED(CONFIG_PREEMPT) &&
+	} while (IS_ENABLED(CONFIG_PREEMPTION) &&
 		 unlikely(tid != READ_ONCE(c->tid)));

 	/* Same with comment on barrier() in slab_alloc_node() */
--- a/net/core/dev.c
+++ b/net/core/dev.c
@ -928,7 +928,7 @@ EXPORT_SYMBOL(dev_get_by_napi_id);
 *
 *	The use of raw_seqcount_begin() and cond_resched() before
 *	retrying is required as we want to give the writers a chance
- *	to complete when CONFIG_PREEMPT is not set.
+ *	to complete when CONFIG_PREEMPTION is not set.
 */
 int netdev_get_name(struct net *net, char *name, int ifindex)
 {