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Nicholas Piggin ffa74f3805 powerpc/watchdog: Fix missed watchdog reset due to memory ordering race 
[ Upstream commit 5dad4ba68a2483fc80d70b9dc90bbe16e1f27263 ]

It is possible for all CPUs to miss the pending cpumask becoming clear,
and then nobody resetting it, which will cause the lockup detector to
stop working. It will eventually expire, but watchdog_smp_panic will
avoid doing anything if the pending mask is clear and it will never be
reset.

Order the cpumask clear vs the subsequent test to close this race.

Add an extra check for an empty pending mask when the watchdog fires and
finds its bit still clear, to try to catch any other possible races or
bugs here and keep the watchdog working. The extra test in
arch_touch_nmi_watchdog is required to prevent the new warning from
firing off.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Debugged-by: Laurent Dufour <ldufour@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211110025056.2084347-2-npiggin@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-01-27 09:04:29 +01:00
..
trace powerpc: consolidate -mno-sched-epilog into FTRACE flags 2019-01-13 09:51:05 +01:00
vdso32 powerpc: Fix vDSO clock_getres() 2019-12-17 20:35:40 +01:00
vdso64 powerpc: Fix vDSO clock_getres() 2019-12-17 20:35:40 +01:00
.gitignore
align.c powerpc/sstep: Introduce GETTYPE macro 2018-06-03 21:19:40 +10:00
asm-offsets.c powerpc: Fix vDSO clock_getres() 2019-12-17 20:35:40 +01:00
audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
btext.c powerpc/btext: add missing of_node_put 2022-01-27 09:04:28 +01:00
cacheinfo.c powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild 2020-01-27 14:50:55 +01:00
cacheinfo.h powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild 2020-01-27 14:50:55 +01:00
compat_audit.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpu_setup_6xx.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
cpu_setup_44x.S
cpu_setup_fsl_booke.S powerpc: Free up CPU feature bits on 64-bit machines 2018-03-24 00:38:51 +11:00
cpu_setup_pa6t.S
cpu_setup_power.S powerpc/64s: Don't init FSCR_DSCR in __init_FSCR() 2020-09-03 11:24:16 +02:00
cpu_setup_ppc970.S
cputable.c powerpc: fix hardware PMU exception bug on PowerVM compatibility mode systems 2020-03-11 14:15:12 +01:00
crash.c powerpc: remove kdump.h from page.h 2018-07-30 22:47:53 +10:00
crash_dump.c
dbell.c KVM: PPC: Book3S HV: use smp_mb() when setting/clearing host_ipi flag 2020-01-09 10:19:08 +01:00
dma-iommu.c powerpc/dma: Fix dma_map_ops::get_required_mask 2020-09-23 12:11:02 +02:00
dma-swiotlb.c swiotlb: rename swiotlb_free to swiotlb_exit 2018-01-15 09:35:39 +01:00
dma.c PCI: Call dma_debug_add_bus() for pci_bus_type from PCI core 2018-07-30 15:58:01 -05:00
dt_cpu_ftrs.c powerpc/64s: Don't let DT CPU features set FSCR_DSCR 2020-06-22 09:05:29 +02:00
eeh.c powerpc/eeh: Fix EEH handling for hugepages in ioremap space. 2021-05-22 10:59:20 +02:00
eeh_cache.c powerpc/eeh: Fix misleading comment in __eeh_addr_cache_get_device() 2018-03-27 23:44:58 +11:00
eeh_dev.c powerpc/eeh: Create PHB PEs after EEH is initialized 2017-09-21 14:56:00 +10:00
eeh_driver.c powerpc/powernv/iov: Ensure the pdn for VFs always contains a valid PE number 2020-02-24 08:34:36 +01:00
eeh_event.c powerpc/eeh: Manage EEH_PE_RECOVERING inside eeh_handle_normal_event() 2018-03-27 23:44:58 +11:00
eeh_pe.c powerpc/eeh: Fix use of EEH_PE_KEEP on wrong field 2019-12-01 09:16:18 +01:00
eeh_sysfs.c powerpc/eeh: Add EEH notify resume sysfs 2018-01-27 20:02:52 +11:00
entry_32.S powerpc/32: Clear on-stack exception marker upon exception return 2019-03-23 20:10:07 +01:00
entry_64.S powerpc/book3s64: Fix link stack flush on context switch 2019-12-01 09:17:46 +01:00
epapr_hcalls.S
epapr_paravirt.c
exceptions-64e.S powerpc/fsl: Fix the flush of branch predictor. 2019-04-03 06:26:20 +02:00
exceptions-64s.S powerpc/64s: flush L1D after user accesses 2020-11-22 10:02:26 +01:00
fadump.c powerpc/fadump: Do not allow hot-remove memory from fadump reserved area. 2019-02-12 19:47:16 +01:00
firmware.c
fpu.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
fsl_booke_entry_mapping.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
head_8xx.S powerpc/8xx: Fix software emulation interrupt 2021-03-04 09:39:47 +01:00
head_32.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
head_40x.S powerpc/405: move PPC405_ERR77 in asm-405.h 2018-07-30 22:48:13 +10:00
head_44x.S
head_64.S powerpc/64: Set up a kernel stack for secondaries before cpu_restore() 2020-12-30 11:25:51 +01:00
head_booke.h powerpc/fsl: Fixed warning: orphan section `__btb_flush_fixup' 2019-04-03 06:26:20 +02:00
head_fsl_booke.S powerpc/fsl: Flush the branch predictor at each kernel entry (32 bit) 2019-04-03 06:26:20 +02:00
hw_breakpoint.c perf/arch/powerpc: Implement hw_breakpoint_arch_parse() 2018-06-26 09:07:55 +02:00
idle.c
idle_6xx.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
idle_book3e.S powerpc/64s: make PACA_IRQ_HARD_DIS track MSR[EE] closely 2018-07-24 22:03:14 +10:00
idle_book3s.S powerpc/powernv/idle: Restore AMR/UAMOR/AMOR after idle 2020-04-17 10:48:53 +02:00
idle_e500.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
idle_power4.S powerpc/64s: Fix PACA_IRQ_HARD_DIS accounting in idle_power4() 2018-08-14 15:36:02 +10:00
ima_kexec.c
io-workarounds.c powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
io.c
iomap.c powerpc: iomap.c: introduce io{read|write}64_{lo_hi|hi_lo} 2018-04-05 14:59:26 +10:00
iommu.c powerpc/iommu: Annotate nested lock for lockdep 2021-05-22 10:59:42 +02:00
irq.c powerpc/irq: fix stack overflow verification 2019-12-31 16:36:32 +01:00
isa-bridge.c powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
jump_label.c jump_label: move 'asm goto' support test to Kconfig 2019-06-04 08:02:34 +02:00
kexec_elf_64.c kernel/kexec_file.c: allow archs to set purgatory load address 2018-04-13 17:10:28 -07:00
kgdb.c powerpc/kgdb: add kgdb_arch_set/remove_breakpoint() 2020-01-27 14:50:00 +01:00
kprobes-ftrace.c bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe 2018-06-21 12:33:19 +02:00
kprobes.c powerpc/kprobes: Fix kprobe Oops happens in booke 2021-08-26 08:36:39 -04:00
kvm.c kmemleak: powerpc: skip scanning holes in the .bss section 2019-05-08 07:21:50 +02:00
kvm_emul.S powerpc: move ASM_CONST and stringify_in_c() into asm-const.h 2018-07-30 22:48:16 +10:00
l2cr_6xx.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
legacy_serial.c powerpc: Look for "stdout-path" when setting up legacy consoles 2018-12-19 19:19:52 +01:00
machine_kexec.c powerpc/crashkernel: Take "mem=" option into account 2020-06-25 15:32:51 +02:00
machine_kexec_32.c
machine_kexec_64.c powerpc/64/kexec: fix race in kexec when XIVE is shutdown 2018-05-10 23:25:08 +10:00
machine_kexec_file_64.c powerpc/kexec: Use common error handling code in setup_new_fdt() 2018-08-10 22:12:36 +10:00
Makefile powerpc: Make setjmp/longjmp signature standard 2020-04-17 10:48:54 +02:00
mce.c powerpc/mce: Schedule work from irq_work 2019-10-11 18:20:49 +02:00
mce_power.c powerpc/mm/mce: Keep irqs disabled during lockless page table walk 2020-01-27 14:51:14 +01:00
misc.S powerpc/misc: merge reloc_offset() and add_reloc_offset() 2018-06-04 00:39:17 +10:00
misc_32.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
misc_64.S powerpc: Allow flush_icache_range to work across ranges >4GB 2019-12-17 20:35:16 +01:00
module.c powerpc64/module elfv1: Set opd addresses after module relocation 2018-11-13 11:08:50 -08:00
module.lds powerpc/modules: Fix alignment of .toc section in kernel modules 2017-12-11 13:03:35 +11:00
module_32.c powerpc/sparse: Fix plain integer as NULL pointer warning 2018-05-25 12:04:38 +10:00
module_64.c powerpc/module64: Fix comment in R_PPC64_ENTRY handling 2021-09-22 11:47:47 +02:00
msi.c powerpc/msi: Fix NULL pointer access in teardown code 2018-12-19 19:19:52 +01:00
nvram_64.c pstore: Convert buf_lock to semaphore 2019-06-11 12:20:52 +02:00
of_platform.c powerpc: Convert to using %pOF instead of full_name 2017-08-23 22:27:04 +10:00
optprobes.c powerpc/kprobes: Do not disable interrupts for optprobes and kprobes_on_ftrace 2017-11-12 23:51:41 +11:00
optprobes_head.S powerpc/64: Rename soft_enabled to irq_soft_mask 2018-01-19 22:37:01 +11:00
paca.c Merge branch 'topic/paca' into next 2018-03-31 09:09:36 +11:00
pci-common.c powerpc/pci: Add ppc_md.discover_phbs() 2021-03-17 16:43:45 +01:00
pci-hotplug.c powerpc/pci: Unroll two pass loop when scanning bridges 2017-12-18 23:05:52 -06:00
pci_32.c powerpc: Remove -Wattribute-alias pragmas 2018-06-25 23:21:13 +09:00
pci_64.c powerpc: Remove -Wattribute-alias pragmas 2018-06-25 23:21:13 +09:00
pci_dn.c powerpc/sriov: Remove VF eeh_dev state when disabling SR-IOV 2020-02-24 08:34:50 +01:00
pci_of_scan.c powerpc/pci/of: Parse unassigned resources 2020-05-10 10:30:06 +02:00
pmc.c
ppc32.h
ppc_save_regs.S powerpc: move ASM_CONST and stringify_in_c() into asm-const.h 2018-07-30 22:48:16 +10:00
proc_powerpc.c powerpc: Use octal numbers for file permissions 2018-01-22 05:48:33 +11:00
process.c powerpc/process: Fix flush_all_to_thread for SPE 2019-12-01 09:17:01 +01:00
prom.c powerpc/prom: Mark identical_pvr_fixup as __init 2021-05-22 10:59:35 +02:00
prom_init.c powerpc/prom_init: Fix improper check of prom_getprop() 2022-01-27 09:04:22 +01:00
prom_init_check.sh powerpc/mm/radix: Update command line parsing for disable_radix 2018-04-04 16:59:50 +10:00
prom_parse.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ptrace.c powerpc/ptrace: Simplify vr_get/set() to avoid GCC warning 2019-03-23 20:10:07 +01:00
ptrace32.c
reloc_32.S
reloc_64.S powerpc/asm: Convert .llong directives to .8byte 2017-08-31 14:26:47 +10:00
rtas-proc.c powerpc updates for 4.18 2018-06-07 10:23:33 -07:00
rtas-rtc.c powerpc: use time64_t in read_persistent_clock 2018-06-03 20:43:33 +10:00
rtas.c powerpc/rtas: Fix typo of ibm,open-errinjct in RTAS filter 2020-12-30 11:26:12 +01:00
rtas_flash.c powerpc: Use octal numbers for file permissions 2018-01-22 05:48:33 +11:00
rtas_pci.c powerpc/kernel: Change retrieval of pci_dn 2017-08-31 14:26:40 +10:00
rtasd.c powerpc/pseries: Remove prrn_work workqueue 2019-04-20 09:16:01 +02:00
security.c powerpc/security: Add a helper to query stf_barrier type 2021-11-26 11:36:17 +01:00
setup-common.c powerpc/64: Set up a kernel stack for secondaries before cpu_restore() 2020-12-30 11:25:51 +01:00
setup.h powerpc/tau: Synchronize function prototypes and body 2018-05-25 12:04:43 +10:00
setup_32.c powerpc/32: Include setup.h header file to fix warnings 2018-08-10 22:12:38 +10:00
setup_64.c powerpc/64s: flush L1D after user accesses 2020-11-22 10:02:26 +01:00
signal.c powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery 2020-02-28 16:38:48 +01:00
signal.h powerpc/syscalls: signal_{32, 64} - switch to SYSCALL_DEFINE 2018-05-10 23:25:13 +10:00
signal_32.c powerpc/tm: Fix clearing MSR[TS] in current when reclaiming on signal delivery 2020-02-28 16:38:48 +01:00
signal_64.c powerpc/64/tm: Don't let userspace set regs->trap via sigreturn 2020-04-17 10:48:53 +02:00
smp-tbsync.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp.c powerpc: Offline CPU in stop_this_cpu() 2021-07-20 16:15:57 +02:00
stacktrace.c powerpc/stacktrace: Include linux/delay.h 2021-09-22 11:48:01 +02:00
suspend.c
swsusp.c
swsusp_32.S powerpc/32s: fix suspend/resume when IBATs 4-7 are used 2019-07-26 09:14:29 +02:00
swsusp_64.c
swsusp_asm64.S powerpc: clean inclusions of asm/feature-fixups.h 2018-07-30 22:48:17 +10:00
swsusp_booke.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sys_ppc32.c powerpc/syscalls: kill ppc32_select() 2018-05-10 23:25:15 +10:00
syscalls.c powerpc: Remove -Wattribute-alias pragmas 2018-06-25 23:21:13 +09:00
sysfs.c powerpc: Warn about use of smt_snooze_delay 2020-11-05 11:08:51 +01:00
systbl.S powerpc/syscalls: Add COMPAT_SPU_NEW() macro 2018-05-10 23:25:14 +10:00
systbl_chk.c powerpc/syscalls: Add COMPAT_SPU_NEW() macro 2018-05-10 23:25:14 +10:00
systbl_chk.sh powerpc: Make it clearer that systbl check errors are errors 2018-05-10 23:25:16 +10:00
tau_6xx.c powerpc/tau: Disable TAU between measurements 2020-10-30 10:38:19 +01:00
time.c Revert "powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled" 2020-04-29 16:31:14 +02:00
tm.S powerpc/tm: Avoid possible userspace r1 corruption on reclaim 2018-09-25 22:51:32 +10:00
traps.c powerpc: improve handling of unrecoverable system reset 2021-03-17 16:43:46 +01:00
udbg.c
udbg_16550.c
uprobes.c powerpc/uprobes: Implement arch_uretprobe_is_alive() 2017-08-24 16:19:21 +10:00
vdso.c powerpc/vdso: Fix vdso cpu truncation 2020-08-19 08:14:57 +02:00
vecemu.c powerpc: Add a missing include header 2018-05-25 12:04:46 +10:00
vector.S powerpc: move ASM_CONST and stringify_in_c() into asm-const.h 2018-07-30 22:48:16 +10:00
vmlinux.lds.S vmlinux.lds.h: Create section for protection against instrumentation 2021-03-24 11:07:31 +01:00
watchdog.c powerpc/watchdog: Fix missed watchdog reset due to memory ordering race 2022-01-27 09:04:29 +01:00