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Linus Torvalds 125b0bb95d asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation 
We really don't want to do atomic_read() or anything like that, since we
already have the value, not the lock.  The whole point of this is that
we've loaded the lock from memory, and we want to check whether the
value we loaded was a locked one or not.

The main use of this is the lockref code, which loads both the lock and
the reference count in one atomic operation, and then works on that
combined value.  With the atomic_read(), the compiler would pointlessly
spill the value to the stack, in order to then be able to read it back
"atomically".

This is the qspinlock version of commit c6f4a9002252 ("asm-generic:
ticket-lock: Optimize arch_spin_value_unlocked()") which fixed this same
bug for ticket locks.

Cc: Guo Ren <guoren@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Link: https://lore.kernel.org/all/CAHk-=whNRv0v6kQiV5QO6DJhjH4KEL36vWQ6Re8Csrnh4zbRkQ@mail.gmail.com/
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2023-11-22 09:32:49 -08:00
..
bitops
mm: delete checks for xor_unlock_is_negative_byte()
2023-10-18 14:34:17 -07:00
vdso
lib/vdso: Avoid highres update if clocksource is not VDSO capable
2020-02-17 20:12:17 +01:00
access_ok.h
uaccess: remove CONFIG_SET_FS
2022-02-25 09:36:06 +01:00
agp.h
char/agp: introduce asm-generic/agp.h
2023-02-13 22:13:29 +01:00
archrandom.h
random: handle archrandom with multiple longs
2022-07-25 13:26:14 +02:00
asm-offsets.h
…
asm-prototypes.h
…
atomic64.h
locking/atomic: delete !ARCH_ATOMIC remnants
2021-05-26 13:20:52 +02:00
atomic.h
locking/atomic: make atomic*_{cmp,}xchg optional
2023-06-05 09:57:14 +02:00
audit_change_attr.h
…
audit_dir_write.h
…
audit_read.h
…
audit_signal.h
…
audit_write.h
…
barrier.h
asm-generic: Add memory barrier dma_mb()
2022-06-23 18:34:58 +01:00
bitops.h
include: move find.h from asm_generic to linux
2022-01-15 08:47:31 -08:00
bitsperlong.h
lib: extend the scope of small_const_nbits() macro
2021-05-06 19:24:11 -07:00
bug.h
panic: make function declarations visible
2023-06-09 17:44:15 -07:00
cache.h
…
cacheflush.h
mm: rationalise flush_icache_pages() and flush_icache_page()
2023-08-24 16:20:25 -07:00
checksum.h
unify generic instances of csum_partial_copy_nocheck()
2020-08-20 15:45:14 -04:00
cmpxchg-local.h
asm-generic: avoid __generic_cmpxchg_local warnings
2023-04-04 17:58:11 +02:00
cmpxchg.h
asm-generic: avoid __generic_cmpxchg_local warnings
2023-04-04 17:58:11 +02:00
compat.h
asm-generic: compat: fix compat_arg_u64() and compat_arg_u64_dual()
2022-11-01 10:20:11 +11:00
current.h
asm-generic: current: Don't include thread-info.h if building asm
2023-08-26 22:38:49 +02:00
delay.h
…
device.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
div64.h
ARM: 9117/1: asm-generic: div64: Remove always-true __div64_const32_is_OK()
2021-08-20 11:39:28 +01:00
dma-mapping.h
dma-mapping: no need to pass a bus_type into get_arch_dma_ops()
2023-02-15 12:35:20 +01:00
dma.h
…
early_ioremap.h
mm/early_ioremap.c: remove redundant early_ioremap_shutdown()
2021-09-08 11:50:24 -07:00
emergency-restart.h
…
error-injection.h
docs: fault-injection: add requirements of error injectable functions
2023-02-02 22:50:00 -08:00
exec.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
export.h
ia64,export.h: replace EXPORT_DATA_SYMBOL* with EXPORT_SYMBOL*
2023-06-22 21:21:06 +09:00
extable.h
…
fb.h
fbdev: Replace fb_pgprotect() with pgprot_framebuffer()
2023-10-12 09:20:46 +02:00
fixmap.h
…
flat.h
binfmt_flat: remove the persistent argument from flat_get_addr_from_rp
2019-06-24 09:16:47 +10:00
ftrace.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
futex.h
futex: Fix additional regressions
2021-12-11 23:31:51 +01:00
getorder.h
asm-generic: force inlining of get_order() to work around gcc10 poor decision
2020-12-15 22:46:15 -08:00
hardirq.h
irqstat: Move declaration into asm-generic/hardirq.h
2020-11-23 10:31:06 +01:00
hugetlb.h
mm: hugetlb: add huge page size param to set_huge_pte_at()
2023-09-29 17:20:47 -07:00
hw_irq.h
…
hyperv-tlfs.h
x86/hyperv: Add smp support for SEV-SNP guest
2023-08-22 00:38:20 +00:00
int-ll64.h
…
io.h
mm: ioremap: remove unneeded ioremap_allowed and iounmap_allowed
2023-08-18 10:12:36 -07:00
ioctl.h
…
iomap.h
asm-generic/iomap.h: remove ARCH_HAS_IOREMAP_xx macros
2023-08-18 10:12:32 -07:00
irq_regs.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
irq_work.h
…
irq.h
…
irqflags.h
…
Kbuild
asm-generic: Fix spelling of architecture
2023-10-06 22:30:22 +02:00
kdebug.h
…
kmap_size.h
mm/highmem: Provide and use CONFIG_DEBUG_KMAP_LOCAL
2020-11-24 14:42:08 +01:00
kprobes.h
treewide: Convert macro and uses of __section(foo) to __section("foo")
2020-10-25 14:51:49 -07:00
kvm_para.h
…
kvm_types.h
KVM: Move x86's version of struct kvm_mmu_memory_cache to common code
2020-07-09 13:29:42 -04:00
linkage.h
…
local64.h
locking/generic: Wire up local{,64}_try_cmpxchg()
2023-04-29 09:09:09 +02:00
local.h
locking/generic: Wire up local{,64}_try_cmpxchg()
2023-04-29 09:09:09 +02:00
logic_io.h
logic_io instance of iounmap() needs volatile on argument
2021-12-21 21:31:08 +01:00
mcs_spinlock.h
…
memory_model.h
mm, arch: add generic implementation of pfn_valid() for FLATMEM
2023-02-09 16:51:41 -08:00
mm_hooks.h
mm: remove arch_bprm_mm_init() hook
2020-01-23 10:41:16 -08:00
mmiowb_types.h
…
mmiowb.h
asm-generic/mmiowb: Allow mmiowb_set_pending() when preemptible()
2020-07-17 10:02:03 +01:00
mmu_context.h
asm-generic: add generic MMU versions of mmu context functions
2020-10-26 16:45:03 +01:00
mmu.h
…
module.h
…
module.lds.h
kbuild: preprocess module linker script
2020-09-25 00:36:41 +09:00
mshyperv.h
hyperv: reduce size of ms_hyperv_info
2023-09-22 20:28:16 +00:00
msi.h
genirq: Get rid of GENERIC_MSI_IRQ_DOMAIN
2022-11-17 15:15:20 +01:00
nommu_context.h
asm-generic: add generic MMU versions of mmu context functions
2020-10-26 16:45:03 +01:00
numa.h
numa: Move numa implementation to common code
2021-01-14 15:08:55 -08:00
page.h
asm-generic/page.h: Make pfn accessors static inlines
2023-05-29 11:27:08 +02:00
param.h
…
parport.h
…
pci_iomap.h
PCI: Stub __pci_ioport_map() for arches that don't support it at all
2022-07-29 12:01:00 -05:00
pci.h
asm-generic: Add new pci.h and use it
2022-07-22 17:34:57 -05:00
percpu.h
percpu: Fix self-assignment of __old in raw_cpu_generic_try_cmpxchg()
2023-06-08 10:28:39 +02:00
pgalloc.h
mm: add statistics for PUD level pagetable
2023-10-06 14:44:10 -07:00
pgtable_uffd.h
userfaultfd: wp: add pmd_swp_*uffd_wp() helpers
2020-04-07 10:43:39 -07:00
pgtable-nop4d.h
mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *
2021-07-08 11:48:22 -07:00
pgtable-nopmd.h
riscv/mm: fix two page table check related issues
2022-05-19 14:08:48 -07:00
pgtable-nopud.h
mm: rename p4d_page_vaddr to p4d_pgtable and make it return pud_t *
2021-07-08 11:48:22 -07:00
preempt.h
riscv: support PREEMPT_DYNAMIC with static keys
2023-08-31 00:18:34 -07:00
qrwlock_types.h
locking/qrwlock: Change "queue rwlock" to "queued rwlock"
2022-05-11 16:27:04 +02:00
qrwlock.h
asm-generic changes for 5.19
2022-05-26 10:50:30 -07:00
qspinlock_types.h
locking/qspinlock: Do not include atomic.h from qspinlock_types.h
2020-07-29 16:14:19 +02:00
qspinlock.h
asm-generic: qspinlock: fix queued_spin_value_unlocked() implementation
2023-11-22 09:32:49 -08:00
resource.h
…
rwonce.h
asm/rwonce: Don't pull <asm/barrier.h> into 'asm-generic/rwonce.h'
2020-07-21 10:50:36 +01:00
seccomp.h
seccomp: Use -1 marker for end of mode 1 syscall list
2020-07-10 16:01:52 -07:00
sections.h
asm-generic: sections: refactor memory_intersects
2022-08-28 14:02:45 -07:00
serial.h
…
set_memory.h
…
shmparam.h
treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers
2019-05-14 19:52:48 -07:00
signal.h
asm-generic: Remove empty #ifdef SA_RESTORER
2022-09-10 09:56:53 +02:00
simd.h
…
softirq_stack.h
asm-generic: Conditionally enable do_softirq_own_stack() via Kconfig.
2022-09-05 17:20:55 +02:00
spinlock_types.h
asm-generic: ticket-lock: New generic ticket-based spinlock
2022-05-11 11:49:38 -07:00
spinlock.h
asm-generic: ticket-lock: Optimize arch_spin_value_unlocked()
2023-09-21 10:17:00 +02:00
statfs.h
…
string.h
…
switch_to.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
syscall.h
ptrace: Create ptrace_report_syscall_{entry,exit} in ptrace.h
2022-03-10 13:35:08 -06:00
syscalls.h
…
timex.h
…
tlb.h
mm: add utility functions for ptdesc
2023-08-21 13:37:52 -07:00
tlbflush.h
…
topology.h
mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA
2021-06-29 10:53:55 -07:00
trace_clock.h
…
uaccess.h
uaccess: remove CONFIG_SET_FS
2022-02-25 09:36:06 +01:00
unaligned.h
asm-generic: make parameter types consistent in _unaligned_be48()
2022-09-11 21:55:12 -07:00
user.h
…
vermagic.h
arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h>
2020-04-23 10:50:26 +09:00
vga.h
…
vmlinux.lds.h
linux/init: remove __memexit* annotations
2023-10-28 21:31:22 +09:00
vtime.h
…
word-at-a-time.h
word-at-a-time: use the same return type for has_zero regardless of endianness
2023-08-02 10:23:36 -07:00
xor.h
lib/xor: make xor prototypes more friendly to compiler vectorization
2022-02-11 20:39:39 +11:00