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Douglas Anderson 8d539b84f1 nmi_backtrace: allow excluding an arbitrary CPU 
The APIs that allow backtracing across CPUs have always had a way to
exclude the current CPU.  This convenience means callers didn't need to
find a place to allocate a CPU mask just to handle the common case.

Let's extend the API to take a CPU ID to exclude instead of just a
boolean.  This isn't any more complex for the API to handle and allows the
hardlockup detector to exclude a different CPU (the one it already did a
trace for) without needing to find space for a CPU mask.

Arguably, this new API also encourages safer behavior.  Specifically if
the caller wants to avoid tracing the current CPU (maybe because they
already traced the current CPU) this makes it more obvious to the caller
that they need to make sure that the current CPU ID can't change.

[akpm@linux-foundation.org: fix trigger_allbutcpu_cpu_backtrace() stub]
Link: https://lkml.kernel.org/r/20230804065935.v4.1.Ia35521b91fc781368945161d7b28538f9996c182@changeid
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Lecopzer Chen <lecopzer.chen@mediatek.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Pingfan Liu <kernelfans@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 		2023-08-18 10:19:00 -07:00
..
hardware ARM: footbridge: remove custom DMA address handling 2022-09-15 15:59:16 +02:00
mach ARM: 9298/1: Drop custom mdesc->handle_irq() 2023-06-19 09:35:48 +01:00
vdso vdso/treewide: Add vdso_data pointer argument to __arch_get_hw_counter() 2020-08-06 10:57:30 +02:00
xen arm/xen: Introduce xen_setup_dma_ops() 2022-06-06 08:54:33 +02:00
Kbuild local64.h: make <asm/local64.h> mandatory 2020-12-29 15:36:49 -08:00
arch_gicv3.h arm64: add ARM64_HAS_GIC_PRIO_RELAXED_SYNC cpucap 2023-01-31 16:06:17 +00:00
arch_timer.h clocksource/drivers/arm_arch_timer: Drop unnecessary ISB on CVAL programming 2021-10-17 21:47:44 +02:00
archrandom.h random: remove CONFIG_ARCH_RANDOM 2022-07-18 15:03:37 +02:00
arm-cci.h
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arm_pmuv3.h ARM: 2023-06-22 17:54:10 -07:00
asm-offsets.h
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assembler.h locking/atomic: arm: fix sync ops 2023-06-05 09:57:13 +02:00
atomic.h locking/atomic: arm: add preprocessor symbols 2023-06-05 09:57:15 +02:00
auxvec.h
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bL_switcher.h
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barrier.h
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bitops.h arm: align find_bit declarations with generic kernel 2022-07-14 15:21:43 -07:00
bitrev.h
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bug.h arm: print alloc free paths for address in registers 2021-05-07 00:26:34 -07:00
bugs.h ARM: cpu: Switch to arch_cpu_finalize_init() 2023-06-16 10:15:59 +02:00
cache.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
cacheflush.h ARM development updates for 5.18: 2022-03-23 17:35:57 -07:00
cachetype.h
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checksum.h net: checksum: drop the linux/uaccess.h include 2023-01-27 11:19:46 +00:00
clocksource.h arm: Introduce asm/vdso/clocksource.h 2020-03-21 15:23:54 +01:00
cmpxchg.h locking/arch: Rename all internal __xchg() names to __arch_xchg() 2023-04-29 09:08:44 +02:00
compiler.h
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cp15.h arm: vdso: Enable arm to use common headers 2020-03-21 15:24:03 +01:00
cpu.h
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cpufeature.h
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cpuidle.h arm64 updates for 5.14 2021-06-28 14:04:24 -07:00
cputype.h ARM: 9267/1: Define Armv8 registers in AArch32 state 2022-11-28 11:57:31 +00:00
cti.h
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current.h ARM: make get_current() and __my_cpu_offset() __always_inline 2022-01-31 16:06:35 +01:00
dcc.h
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delay.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
device.h ARM/dma-mapping: remove the dma_coherent member of struct dev_archdata 2022-10-06 14:31:08 +02:00
div64.h ARM: 9118/1: div64: Remove always-true __div64_const32_is_OK() duplicate 2021-08-20 11:39:28 +01:00
dma-iommu.h ARM/dma-mapping: const a pointer to bus_type in arm_iommu_create_mapping() 2023-03-23 13:21:51 +01:00
dma.h ARM: footbridge: remove custom DMA address handling 2022-09-15 15:59:16 +02:00
dmi.h
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domain.h ARM: 9211/1: domain: drop modify_domain() 2022-07-06 22:44:49 +01:00
ecard.h
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edac.h
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efi.h efi: Discover BTI support in runtime services regions 2023-02-04 09:19:02 +01:00
elf.h ARM: module: implement support for PC-relative group relocations 2021-12-06 12:49:16 +01:00
exception.h
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fb.h arch/arm: Implement <asm/fb.h> with generic helpers 2023-04-20 10:04:24 +02:00
fiq.h
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firmware.h
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fixmap.h ARM updates for 5.11: 2020-12-22 13:34:27 -08:00
floppy.h floppy: split the base port from the register in I/O accesses 2020-05-12 19:34:52 +03:00
fncpy.h
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fpstate.h ARM: 9228/1: vfp: kill vfp_flush/release_thread() 2022-08-31 14:50:08 +01:00
ftrace.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
futex.h ARM: futex: Address build warning 2020-05-07 00:41:47 +02:00
glue-cache.h
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glue-df.h
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glue-pf.h
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glue-proc.h
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glue.h
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hardirq.h ARM: irqstat: Get rid of duplicated declaration 2020-11-23 10:31:05 +01:00
highmem.h ARM: highmem: Fix cache_is_vivt() reference 2020-12-04 23:35:34 +01:00
hugetlb-3level.h
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hugetlb.h mm/hugetlb: define a generic fallback for arch_clear_hugepage_flags() 2020-06-03 20:09:46 -07:00
hw_breakpoint.h
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hw_irq.h
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hwcap.h
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hypervisor.h arm/arm64: Probe for the presence of KVM hypervisor 2021-03-31 09:16:55 +01:00
ide.h
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idmap.h treewide: Convert macro and uses of __section(foo) to __section("foo") 2020-10-25 14:51:49 -07:00
insn.h ARM: 9176/1: avoid literal references in inline assembly 2022-01-06 12:58:58 +00:00
io.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
irq.h nmi_backtrace: allow excluding an arbitrary CPU 2023-08-18 10:19:00 -07:00
irq_work.h ARM: 9217/1: add definition of arch_irq_work_raise() 2022-07-28 15:09:15 +01:00
irqflags.h
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jump_label.h
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kasan.h ARM: 9016/2: Initialize the mapping of KASan shadow memory 2020-10-27 12:11:10 +00:00
kasan_def.h ARM: 9015/2: Define the virtual space of KASan's shadow region 2020-10-27 12:11:08 +00:00
kexec-internal.h ARM: kexec: fix oops after TLB are invalidated 2021-02-05 10:23:29 +00:00
kexec.h ARM: 9060/1: kexec: Remove unused kexec_reinit callback 2021-03-09 10:25:35 +00:00
kfence.h ARM: 9166/1: Support KFENCE for ARM 2021-12-17 11:34:38 +00:00
kgdb.h
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kprobes.h ARM: 9019/1: kprobes: Avoid fortify_panic() when copying optprobe template 2020-10-27 12:11:51 +00:00
krait-l2-accessors.h
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linkage.h
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mc146818rtc.h
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mcpm.h
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mcs_spinlock.h
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memblock.h
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memory.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
mmu.h ARM: mm: make vmalloc_seq handling SMP safe 2022-01-25 09:53:52 +01:00
mmu_context.h ARM: mm: make vmalloc_seq handling SMP safe 2022-01-25 09:53:52 +01:00
module.h ARM: 9252/1: module: Teach unwinder about PLTs 2022-11-07 14:18:59 +00:00
module.lds.h kbuild: preprocess module linker script 2020-09-25 00:36:41 +09:00
mpu.h
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mtd-xip.h
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neon.h
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nwflash.h misc: move FLASH_MINOR into miscdevice.h and fix conflicts 2020-03-18 12:27:04 +01:00
opcodes-sec.h
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opcodes-virt.h
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opcodes.h ARM: 9145/1: patch: fix BE32 compilation 2021-10-25 13:12:36 +01:00
outercache.h
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page-nommu.h
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page.h asm-generic updates for 6.5 2023-07-06 10:06:04 -07:00
paravirt.h x86/paravirt: Switch time pvops functions to use static_call() 2021-03-11 16:17:52 +01:00
paravirt_api_clock.h sched/headers: ARM needs asm/paravirt_api_clock.h too 2022-03-22 08:53:10 +01:00
patch.h
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pci.h PCI: Remove pci_get_legacy_ide_irq() and asm-generic/pci.h 2022-07-22 17:23:45 -05:00
percpu.h ARM: make get_current() and __my_cpu_offset() __always_inline 2022-01-31 16:06:35 +01:00
perf_event.h ARM: 9251/1: perf: Fix stacktraces for tracepoint events in THUMB2 kernels 2022-11-07 14:16:43 +00:00
pgalloc.h mm/thp: define default pmd_pgtable() 2021-07-01 11:06:03 -07:00
pgtable-2level-hwdef.h
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pgtable-2level-types.h
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pgtable-2level.h arm/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE 2023-02-02 22:33:06 -08:00
pgtable-3level-hwdef.h
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pgtable-3level-types.h
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pgtable-3level.h arm/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE 2023-02-02 22:33:06 -08:00
pgtable-hwdef.h
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pgtable-nommu.h MM patches for 6.2-rc1. 2022-12-13 19:29:45 -08:00
pgtable.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
probes.h
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proc-fns.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
processor.h kernel: exit: cleanup release_thread() 2022-09-11 21:55:07 -07:00
procinfo.h
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prom.h ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address 2020-10-27 12:10:59 +00:00
psci.h
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ptdump.h ARM: 9255/1: efi/dump UEFI runtime page tables for ARM 2022-11-07 14:19:01 +00:00
ptrace.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
seccomp.h arm: Enable seccomp architecture tracking 2020-11-20 11:16:34 -08:00
sections.h arm: Remove HYP/Stage-2 page-table support 2020-03-24 10:56:05 +00:00
secure_cntvoff.h
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semihost.h serial: earlycon-arm-semihost: Move smh_putc() variants in respective arch's semihost.h 2023-01-19 14:58:19 +01:00
set_memory.h ARM: 9164/1: mm: Provide set_memory_valid() 2021-12-17 11:34:36 +00:00
setup.h Move the Arm architecture documentation under Documentation/arch/. This 2023-06-27 11:58:16 -07:00
shmparam.h
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signal.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
simd.h ARM: 9283/1: permit non-nested kernel mode NEON in softirq context 2023-01-11 16:21:21 +00:00
smp.h ARM: smp: Switch to hotplug core state synchronization 2023-05-15 13:44:57 +02:00
smp_plat.h
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smp_scu.h
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smp_twd.h
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sparsemem.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
spectre.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
spinlock.h locking: Fix typos in comments 2021-03-22 02:45:52 +01:00
spinlock_types.h locking: Allow to include asm/spinlock_types.h from linux/spinlock_types_raw.h 2021-12-07 15:14:12 +01:00
stackprotector.h stackprotector: actually use get_random_canary() 2022-11-18 02:18:10 +01:00
stacktrace.h ARM: 9258/1: stacktrace: Make stack walk callback consistent with generic code 2022-11-08 18:36:18 +00:00
string.h ARM: 9014/2: Replace string mem* functions for KASan 2020-10-27 12:11:06 +00:00
suspend.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
swab.h
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switch_to.h ARM development updates for 5.18: 2022-03-23 17:35:57 -07:00
sync_bitops.h locking/atomic: arm: fix sync ops 2023-06-05 09:57:13 +02:00
syscall.h arch: remove unused function syscall_set_arguments() 2021-09-14 16:06:20 +02:00
syscalls.h ARM: 9309/1: add missing syscall prototypes 2023-06-19 09:35:55 +01:00
system_info.h
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system_misc.h ARM: 9096/1: Remove arm_pm_restart() 2021-06-13 18:16:48 +01:00
tcm.h ARM: 9314/1: tcm: move tcm_init() prototype to asm/tcm.h 2023-06-19 09:35:59 +01:00
therm.h
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thread_info.h ARM: renumber bits related to _TIF_WORK_MASK 2023-01-04 07:55:02 -07:00
thread_notify.h
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timex.h arm: use fallback for random_get_entropy() instead of zero 2022-05-13 23:59:23 +02:00
tlb.h mm: account PMD tables like PTE tables 2020-10-13 18:38:31 -07:00
tlbflush.h mm: update legacy flush_tlb_* to use vma 2021-06-29 10:53:52 -07:00
tls.h ARM: smp: elide HWCAP_TLS checks or __entry_task updates on SMP+v6 2022-01-25 09:53:52 +01:00
topology.h arch_topology: Remove unused topology_set_thermal_pressure() and related 2021-11-23 15:10:26 +05:30
traps.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
uaccess-asm.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
uaccess.h ARM: mm: Make virt_to_pfn() a static inline 2023-05-29 11:27:08 +02:00
ucontext.h ARM: ep93xx: remove MaverickCrunch support 2021-08-04 13:30:04 +02:00
unified.h ARM: 9116/1: unified: Remove check for gcc < 4 2021-08-20 11:39:28 +01:00
unistd.h
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unwind.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
uprobes.h
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user.h asm/user.h: killed unused macros 2022-01-30 21:17:00 -05:00
v7m.h irqchip: nvic: Use GENERIC_IRQ_MULTI_HANDLER 2021-12-06 12:49:16 +01:00
vdso.h ARM: 9313/1: vdso: add missing prototypes 2023-06-19 09:35:58 +01:00
vdso_datapage.h
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vermagic.h arch: split MODULE_ARCH_VERMAGIC definitions out to <asm/vermagic.h> 2020-04-23 10:50:26 +09:00
vfp.h ARM: 9304/1: add prototype for function called only from asm 2023-06-19 09:35:52 +01:00
vfpmacros.h ARM: 8991/1: use VFP assembler mnemonics if available 2020-07-21 16:33:39 +01:00
vga.h
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virt.h arm: Remove the ability to set HYP vectors outside of the decompressor 2020-03-24 10:56:05 +00:00
vmalloc.h
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vmlinux.lds.h objtool/idle: Validate __cpuidle code as noinstr 2023-01-13 11:48:15 +01:00
word-at-a-time.h
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xor.h ARM: 9260/1: lib/xor: use r10 rather than r7 in xor_arm4regs_{2|3} 2022-11-07 14:19:03 +00:00