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Nicholas Piggin 8defc2a5dd powerpc/64s/interrupt: Fix decrementer storm 
The decrementer exception can fail to be cleared when the interrupt
returns in the case where the decrementer wraps with the next timer
still beyond decrementer_max. This results in a decrementer interrupt
storm. This is triggerable with small decrementer system with hard
and soft watchdogs disabled.

Fix this by always programming the decrementer if there was no timer.

Fixes: 0faf20a1ad16 ("powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use")
Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220124143930.3923442-1-npiggin@gmail.com
2022-01-25 16:50:10 +11:00
..
ptrace
powerpc: Snapshot thread flags
2021-12-01 00:06:44 +01:00
syscalls
mm/mempolicy: wire up syscall set_mempolicy_home_node
2022-01-15 16:30:30 +02:00
trace
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
vdso32
powerpc updates for 5.13
2021-04-30 12:22:28 -07:00
vdso64
powerpc/vdso: Don't use r30 to avoid breaking Go lang
2021-07-29 23:13:12 +10:00
.gitignore
…
align.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
asm-offsets.c
powerpc/config: Add CONFIG_BOOKE_OR_40x
2021-12-09 22:41:19 +11:00
audit.c
Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC"
2021-10-27 22:30:32 +11:00
btext.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
cacheinfo.c
powerpc/cacheinfo: use default_groups in kobj_type
2022-01-05 10:58:23 +11:00
cacheinfo.h
…
compat_audit.c
Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC"
2021-10-27 22:30:32 +11:00
cpu_setup_6xx.S
…
cpu_setup_44x.S
…
cpu_setup_fsl_booke.S
powerpc: Retire e200 core (mpc555x processor)
2020-12-05 21:49:18 +11:00
cpu_setup_pa6t.S
…
cpu_setup_power.c
powerpc/64s: Always set PMU control registers to frozen/disabled when not in use
2021-11-24 21:08:57 +11:00
cpu_setup_ppc970.S
…
cputable.c
arch: powerpc: Stop building and using oprofile
2021-01-29 10:05:51 +05:30
crash_dump.c
powerpc: Don't use 'struct ppc_inst' to reference instruction location
2021-06-17 00:09:00 +10:00
dawr.c
powerpc: rename powerpc_debugfs_root to arch_debugfs_dir
2021-08-13 22:04:26 +10:00
dbell.c
powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use
2021-12-16 21:31:45 +11:00
dma-iommu.c
powerpc/iommu: Report the correct most efficient DMA mask for PCI devices
2021-09-30 17:10:17 +10:00
dma-mask.c
…
dma-swiotlb.c
…
dt_cpu_ftrs.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
early_32.c
…
eeh_cache.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
eeh_driver.c
powerpc/eeh: Use a goto for recovery failures
2021-11-25 11:25:31 +11:00
eeh_event.c
…
eeh_pe.c
powerpc/eeh: Delete eeh_pe->config_addr
2020-10-07 22:34:47 +11:00
eeh_sysfs.c
…
eeh.c
pci-v5.16-changes
2021-11-06 14:36:12 -07:00
entry_32.S
powerpc/config: Add CONFIG_BOOKE_OR_40x
2021-12-09 22:41:19 +11:00
entry_64.S
powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU
2021-12-09 22:41:13 +11:00
epapr_hcalls.S
…
epapr_paravirt.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
exceptions-64e.S
powerpc: flexible GPR range save/restore macros
2021-11-29 23:15:20 +11:00
exceptions-64s.S
powerpc/64/asm: Do not reassign labels
2021-12-23 22:35:12 +11:00
fadump.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
firmware.c
powerpc: fix unbalanced node refcount in check_kvm_guest()
2021-10-09 00:15:59 +11:00
fpu.S
powerpc/64s/interrupt: handle MSR EE and RI in interrupt entry wrapper
2021-12-16 21:31:45 +11:00
fsl_booke_entry_mapping.S
powerpc/booke: Avoid link stack corruption in several places
2021-08-25 13:35:47 +10:00
head_8xx.S
powerpc/8xx: Fix pinned TLBs with CONFIG_STRICT_KERNEL_RWX
2021-11-16 21:37:10 +11:00
head_32.h
powerpc updates for 5.17
2022-01-14 15:17:26 +01:00
head_40x.S
powerpc/kuap: Wire-up KUAP on 40x
2021-12-09 22:41:20 +11:00
head_44x.S
powerpc/kuap: Wire-up KUAP on 44x
2021-12-09 22:41:20 +11:00
head_64.S
powerpc/64/asm: Do not reassign labels
2021-12-23 22:35:12 +11:00
head_book3s_32.S
powerpc/32s: Do kuep_lock() and kuep_unlock() in assembly
2021-12-09 22:41:17 +11:00
head_booke.h
powerpc: flexible GPR range save/restore macros
2021-11-29 23:15:20 +11:00
head_fsl_booke.S
powerpc/kuap: Wire-up KUAP on 85xx in 32 bits mode.
2021-12-09 22:41:20 +11:00
hw_breakpoint_constraints.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
hw_breakpoint.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
idle_6xx.S
powerpc/mm: Switch obsolete dssall to .long
2021-12-23 22:35:13 +11:00
idle_book3e.S
…
idle_book3s.S
powerpc/idle: Don't corrupt back chain when going idle
2021-10-20 21:37:58 +11:00
idle_e500.S
powerpc/32: Return directly from power_save_ppc32_restore()
2021-03-29 13:22:10 +11:00
idle.c
powerpc/mm: Switch obsolete dssall to .long
2021-12-23 22:35:13 +11:00
ima_arch.c
…
interrupt_64.S
powerpc/64s: Mask SRR0 before checking against the masked NIP
2022-01-18 10:25:18 +11:00
interrupt.c
powerpc updates for 5.17
2022-01-14 15:17:26 +01:00
io-workarounds.c
powerpc: Fix reverse map real-mode address lookup with huge vmalloc
2021-05-28 22:54:27 +10:00
io.c
…
iomap.c
powerpc: inline iomap accessors
2020-12-04 01:01:09 +11:00
iommu.c
powerpc updates for 5.15
2021-09-03 11:22:50 -07:00
irq.c
powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use
2021-12-16 21:31:45 +11:00
isa-bridge.c
mm/vmalloc: remove unmap_kernel_range
2021-04-30 11:20:40 -07:00
jump_label.c
powerpc: Don't use 'struct ppc_inst' to reference instruction location
2021-06-17 00:09:00 +10:00
kdebugfs.c
powerpc: rename powerpc_debugfs_root to arch_debugfs_dir
2021-08-13 22:04:26 +10:00
kgdb.c
powerpc/config: Add CONFIG_BOOKE_OR_40x
2021-12-09 22:41:19 +11:00
kprobes-ftrace.c
ftrace: disable preemption when recursion locked
2021-10-27 11:21:49 -04:00
kprobes.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
kvm_emul.S
…
kvm.c
gup: Turn fault_in_pages_{readable,writeable} into fault_in_{readable,writeable}
2021-10-18 16:33:03 +02:00
l2cr_6xx.S
powerpc/mm: Switch obsolete dssall to .long
2021-12-23 22:35:13 +11:00
legacy_serial.c
powerpc/legacy_serial: Fix UBSAN: array-index-out-of-bounds
2021-05-12 11:07:39 +10:00
Makefile
powerpc updates for 5.17
2022-01-14 15:17:26 +01:00
mce_power.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
mce.c
powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU
2021-12-09 22:41:13 +11:00
misc_32.S
powerpc: Avoid link stack corruption in misc asm functions
2021-08-25 13:35:47 +10:00
misc_64.S
powerpc: Avoid link stack corruption in misc asm functions
2021-08-25 13:35:47 +10:00
misc.S
powerpc: Avoid link stack corruption in misc asm functions
2021-08-25 13:35:47 +10:00
module_32.c
powerpc/ftrace: Activate HAVE_DYNAMIC_FTRACE_WITH_REGS on PPC32
2021-11-29 22:49:29 +11:00
module_64.c
powerpc/module_64: Fix livepatching for RO modules
2021-12-14 23:13:03 +11:00
module.c
powerpc/modules: Don't WARN on first module allocation attempt
2021-11-30 22:44:32 +11:00
msi.c
…
note.S
…
nvram_64.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
of_platform.c
…
optprobes_head.S
powerpc: flexible GPR range save/restore macros
2021-11-29 23:15:20 +11:00
optprobes.c
powerpc/inst: Define ppc_inst_t as u32 on PPC32
2021-12-09 22:41:21 +11:00
paca.c
powerpc/64s: Move hash MMU support code under CONFIG_PPC_64S_HASH_MMU
2021-12-09 22:41:13 +11:00
pci_32.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
pci_64.c
mm/vmalloc: remove unmap_kernel_range
2021-04-30 11:20:40 -07:00
pci_dn.c
powerpc/pci: Move PHB discovery for PCI_DN using platforms
2021-02-09 00:01:05 +11:00
pci_of_scan.c
…
pci-common.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
pci-hotplug.c
…
pmc.c
…
ppc32.h
…
ppc_save_regs.S
…
proc_powerpc.c
proc: remove PDE_DATA() completely
2022-01-22 08:33:37 +02:00
process.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
prom_init_check.sh
…
prom_init.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
prom_parse.c
…
prom.c
powerpc updates for 5.17
2022-01-14 15:17:26 +01:00
reloc_32.S
powerpc: Avoid link stack corruption in misc asm functions
2021-08-25 13:35:47 +10:00
reloc_64.S
…
rtas_flash.c
…
rtas_pci.c
…
rtas-proc.c
powerpc/rtas: rename RTAS_RMOBUF_MAX to RTAS_USER_REGION_SIZE
2021-04-14 23:04:16 +10:00
rtas-rtc.c
powerpc/rtas-rtc: remove unused constant
2021-06-25 14:47:20 +10:00
rtas.c
powerpc/rtas: rtas_busy_delay_time() kernel-doc
2021-11-25 11:25:33 +11:00
rtasd.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
secure_boot.c
…
security.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
secvar-ops.c
…
secvar-sysfs.c
…
setup_32.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
setup_64.c
Merge branch 'akpm' (patches from Andrew)
2022-01-20 10:41:01 +02:00
setup-common.c
powerpc: Mark probe_machine() __init and static
2021-11-29 22:49:26 +11:00
setup.h
powerpc/config: Add CONFIG_BOOKE_OR_40x
2021-12-09 22:41:19 +11:00
signal_32.c
powerpc/signal32: Use struct_group() to zero spe regs
2021-12-02 10:39:00 +11:00
signal_64.c
signal: Replace force_fatal_sig with force_exit_sig when in doubt
2021-11-19 09:15:58 -06:00
signal.c
entry: rseq: Call rseq_handle_notify_resume() in tracehook_notify_resume()
2021-09-22 10:24:01 -04:00
signal.h
powerpc/signal32: Fix sigset_t copy
2021-11-16 21:24:16 +11:00
smp-tbsync.c
…
smp.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
stacktrace.c
kprobes: treewide: Make it harder to refer kretprobe_trampoline directly
2021-09-30 21:24:06 -04:00
static_call.c
powerpc/32: Add support for out-of-line static calls
2021-10-22 15:22:05 +11:00
suspend.c
…
swsusp_32.S
powerpc/mm: Switch obsolete dssall to .long
2021-12-23 22:35:13 +11:00
swsusp_64.c
powerpc/machdep: Remove stale functions from ppc_md structure
2021-10-22 15:22:05 +11:00
swsusp_asm64.S
powerpc/mm: Switch obsolete dssall to .long
2021-12-23 22:35:13 +11:00
swsusp_booke.S
…
swsusp.c
…
sys_ppc32.c
powerpc/compat_sys: swap hi/lo parts of 64-bit syscall args in LE mode
2021-02-11 23:35:07 +11:00
syscalls.c
powerpc/syscalls: Simplify do_mmap2()
2021-08-25 13:35:48 +10:00
sysfs.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
systbl_chk.sh
…
systbl.S
powerpc/syscalls: switch to generic syscalltbl.sh
2021-04-14 23:04:16 +10:00
tau_6xx.c
powerpc/tau: Add 'static' storage qualifier to 'tau_work' definition
2021-08-20 17:00:53 +10:00
time.c
powerpc/64s/interrupt: Fix decrementer storm
2022-01-25 16:50:10 +11:00
tm.S
powerpc: flexible GPR range save/restore macros
2021-11-29 23:15:20 +11:00
traps.c
exit: Add and use make_task_dead.
2021-12-13 12:04:45 -06:00
ucall.S
…
udbg_16550.c
powerpc/kernel: Add __init attribute to eligible functions
2021-12-23 22:33:10 +11:00
udbg.c
isystem: ship and use stdarg.h
2021-08-19 09:02:55 +09:00
uprobes.c
powerpc/64s: avoid reloading (H)SRR registers if they are still valid
2021-06-25 00:06:55 +10:00
vdso32_wrapper.S
powerpc/vdso: fix unnecessary rebuilds of vgettimeofday.o
2021-01-30 22:23:42 +11:00
vdso64_wrapper.S
powerpc/vdso: fix unnecessary rebuilds of vgettimeofday.o
2021-01-30 22:23:42 +11:00
vdso.c
powerpc/vdso: Add support for time namespaces
2021-04-14 23:04:44 +10:00
vecemu.c
powerpc/inst: Define ppc_inst_t
2021-12-09 22:41:21 +11:00
vector.S
powerpc/64s/interrupt: handle MSR EE and RI in interrupt entry wrapper
2021-12-16 21:31:45 +11:00
vmlinux.lds.S
powerpc/toc: Future proof kernel toc
2021-12-23 22:35:01 +11:00
watchdog.c
powerpc/watchdog: help remote CPUs to flush NMI printk output
2021-11-29 23:08:43 +11:00