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Michel Lespinasse b52e0a7c4e x86: Fix trigger_all_cpu_backtrace() implementation 
The following change fixes the x86 implementation of
trigger_all_cpu_backtrace(), which was previously (accidentally,
as far as I can tell) disabled to always return false as on
architectures that do not implement this function.

trigger_all_cpu_backtrace(), as defined in include/linux/nmi.h,
should call arch_trigger_all_cpu_backtrace() if available, or
return false if the underlying arch doesn't implement this
function.

x86 did provide a suitable arch_trigger_all_cpu_backtrace()
implementation, but it wasn't actually being used because it was
declared in asm/nmi.h, which linux/nmi.h doesn't include. Also,
linux/nmi.h couldn't easily be fixed by including asm/nmi.h,
because that file is not available on all architectures.

I am proposing to fix this by moving the x86 definition of
arch_trigger_all_cpu_backtrace() to asm/irq.h.

Tested via: echo l > /proc/sysrq-trigger

Before the change, this uses a fallback implementation which
shows backtraces on active CPUs (using
smp_call_function_interrupt() )

After the change, this shows NMI backtraces on all CPUs

Signed-off-by: Michel Lespinasse <walken@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1370518875-1346-1-git-send-email-walken@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-06-20 14:00:21 +02:00
..
crypto crypto: camellia - add AVX2/AES-NI/x86_64 assembler implementation of camellia cipher 2013-04-25 21:09:07 +08:00
numachip x86/PCI: Add NumaChip remote PCI support 2012-12-07 14:24:32 -07:00
uv x86, uv, uv3: Trim MMR register definitions after code changes for SGI UV3 2013-02-11 17:18:25 -08:00
visws
xen xen-pciback: notify hypervisor about devices intended to be assigned to guests 2013-03-22 10:20:55 -04:00
a.out-core.h
acpi.h ACPICA: Update compilation environment settings. 2013-01-10 12:36:17 +01:00
agp.h
alternative-asm.h x86, alternative: Add header guards to <asm/alternative-asm.h> 2012-09-21 12:45:26 -07:00
alternative.h Merge branch 'x86-smap-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-10-01 13:59:17 -07:00
amd_nb.h x86, AMD, NB: Add multi-domain support 2013-01-10 16:17:58 +01:00
apb_timer.h
apic.h sections: fix section conflicts in arch/x86 2012-10-06 03:04:40 +09:00
apic_flat_64.h
apicdef.h
apm.h
arch_hweight.h
archrandom.h
asm-offsets.h
asm.h
atomic.h x86, 386 removal: Remove CONFIG_XADD 2012-11-29 13:23:02 -08:00
atomic64_32.h
atomic64_64.h
barrier.h
bios_ebda.h
bitops.h x86: Use REP BSF unconditionally 2012-09-19 17:26:08 +02:00
boot.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
bootparam_utils.h x86, doc: Be explicit about what the x86 struct boot_params requires 2013-03-06 20:34:43 -08:00
bug.h dump_stack: unify debug information printed by show_regs() 2013-04-30 17:04:02 -07:00
bugs.h
cache.h
cacheflush.h
calgary.h
calling.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
ce4100.h
checksum.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
checksum_32.h
checksum_64.h
clocksource.h x86: pvclock: generic pvclock vsyscall initialization 2012-11-27 23:29:09 -02:00
cmpxchg.h x86 cmpxchg.h: fix wrong comment 2013-04-25 10:39:04 +02:00
cmpxchg_32.h x86, 386 removal: Remove CONFIG_CMPXCHG 2012-11-29 13:23:01 -08:00
cmpxchg_64.h
compat.h compat: move compat_siginfo_t definition to asm/compat.h 2012-10-06 03:05:16 +09:00
context_tracking.h context_tracking: Move exception handling to generic code 2013-03-07 17:09:25 +01:00
cpu.h x86, topology: Debug CPU0 hotplug 2012-11-14 15:28:11 -08:00
cpu_device_id.h
cpufeature.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2013-05-02 14:53:12 -07:00
cpumask.h
cputime.h
current.h
debugreg.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
delay.h
desc.h
desc_defs.h
device.h driver core / ACPI: Move ACPI support to core device and driver types 2012-11-15 00:28:00 +01:00
div64.h
dma-contiguous.h
dma-mapping.h dma-debug: New interfaces to debug dma mapping errors 2012-10-24 17:06:43 +02:00
dma.h
dmi.h
dwarf2.h
e820.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
edac.h
efi.h Modify UEFI anti-bricking code 2013-06-10 21:59:37 +01:00
elf.h mm: use vm_unmapped_area() on x86_64 architecture 2012-12-11 17:22:25 -08:00
emergency-restart.h
entry_arch.h KVM: VMX: Register a new IPI for posted interrupt 2013-04-16 16:32:39 -03:00
exec.h
fb.h
fixmap.h Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 08:40:35 -07:00
floppy.h
fpu-internal.h x86: convert to ksignal 2013-02-14 09:21:17 -05:00
frame.h
ftrace.h tracing/syscalls: Allow archs to ignore tracing compat syscalls 2013-02-12 17:46:28 -05:00
futex.h x86, 386 removal: Remove CONFIG_BSWAP 2012-11-29 13:23:02 -08:00
gart.h
genapic.h
geode.h
gpio.h
hardirq.h KVM: VMX: Register a new IPI for posted interrupt 2013-04-16 16:32:39 -03:00
highmem.h
hpet.h x86, hpet: Introduce x86_msi_ops.setup_hpet_msi 2013-01-28 10:48:30 +01:00
hugetlb.h mm/hugetlb: add more arch-defined huge_pte functions 2013-04-29 15:54:33 -07:00
hw_breakpoint.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
hw_irq.h KVM: VMX: Register a new IPI for posted interrupt 2013-04-16 16:32:39 -03:00
hypertransport.h
hypervisor.h x86: Make Linux guest support optional 2013-03-04 13:14:25 -08:00
i387.h x86, kvm: fix kvm's usage of kernel_fpu_begin/end() 2012-09-21 16:59:04 -07:00
i8259.h
ia32.h x86: switch to generic old sigaction 2013-02-03 18:16:27 -05:00
ia32_unistd.h
idle.h
inat.h
inat_types.h
init.h x86, 64bit, mm: Add generic kernel/ident mapping helper 2013-01-29 15:12:25 -08:00
insn.h
inst.h x86, crc32-pclmul: Fix build with older binutils 2013-05-30 16:36:23 -07:00
intel_scu_ipc.h
io.h
io_apic.h x86, io_apic: Introduce eoi_ioapic_pin call-back 2013-01-28 12:51:52 +01:00
iomap.h
iommu.h
iommu_table.h x86/iommu: Use NULL instead of plain 0 for __IOMMU_INIT 2012-09-05 10:52:26 +02:00
ipi.h
irq.h x86: Fix trigger_all_cpu_backtrace() implementation 2013-06-20 14:00:21 +02:00
irq_regs.h
irq_remapping.h iommu: Fix compile warnings with forward declarations 2013-04-19 20:34:55 +02:00
irq_vectors.h KVM: VMX: Register a new IPI for posted interrupt 2013-04-16 16:32:39 -03:00
irqflags.h
ist.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
jump_label.h
kbdleds.h
Kbuild UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
kdebug.h
kexec.h x86, kexec: Remove 1024G limitation for kexec buffer on 64bit 2013-01-29 15:26:23 -08:00
kgdb.h
kmap_types.h
kmemcheck.h
kprobes.h kprobes/x86: Check Interrupt Flag modifier when registering probe 2013-03-18 10:21:23 +01:00
kvm_emulate.h KVM: emulator: optimize "rep ins" handling 2012-09-06 18:07:38 +03:00
kvm_guest.h x86: kvm guest: pvclock vsyscall support 2012-11-27 23:29:10 -02:00
kvm_host.h KVM: x86: Account for failing enable_irq_window for NMI window request 2013-05-02 22:17:38 -03:00
kvm_para.h Merge tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2013-02-24 13:07:18 -08:00
lguest.h lguest: map Switcher below fixmap. 2013-04-22 15:45:03 +09:30
lguest_hcall.h
linkage.h ix86: Tighten asmlinkage_protect() constraints 2013-01-24 11:25:59 +01:00
local.h x86, 386 removal: Remove CONFIG_XADD 2012-11-29 13:23:02 -08:00
local64.h
mach_timer.h
mach_traps.h
math_emu.h
mc146818rtc.h
mce.h x86/mce: Rework cmci_rediscover() to play well with CPU hotplug 2013-04-02 14:04:01 -07:00
microcode.h x86: Fix section mismatch on load_ucode_ap 2013-06-19 14:43:59 -07:00
microcode_intel.h x86/microcode_intel.h: Define functions and macros for early loading ucode 2013-01-31 13:18:50 -08:00
mmconfig.h
mmu.h
mmu_context.h
mmx.h
mmzone.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
mmzone_32.h x86-32, mm: Remove reference to resume_map_numa_kva() 2013-01-31 14:12:30 -08:00
mmzone_64.h
module.h x86, 386 removal: Remove CONFIG_M386 from Kconfig 2012-11-29 13:23:01 -08:00
mpspec.h
mpspec_def.h
mrst-vrtc.h
mrst.h
mshyperv.h X86: Handle Hyper-V vmbus interrupts as special hypervisor interrupts 2013-02-12 16:27:15 -08:00
msidef.h
msr.h x86, msr: Unify variable names 2013-04-02 16:03:32 -07:00
mtrr.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
mutex.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
mutex_32.h
mutex_64.h
mwait.h intel_idle: remove assumption of one C-state per MWAIT flag 2013-02-08 19:29:16 -05:00
nmi.h x86: Fix trigger_all_cpu_backtrace() implementation 2013-06-20 14:00:21 +02:00
nops.h
numa.h cpu-hotplug,memory-hotplug: clear cpu_to_node() when offlining the node 2013-02-23 17:50:13 -08:00
numa_32.h
numaq.h
olpc.h x86: OLPC: switch over to using new EC driver on x86 2012-07-31 23:27:30 -04:00
olpc_ofw.h
page.h Merge remote-tracking branch 'origin/x86/mm' into x86/mm2 2013-02-01 02:28:36 -08:00
page_32.h x86: Make it so that __pa_symbol can only process kernel symbols on x86_64 2012-11-16 16:42:09 -08:00
page_32_types.h
page_64.h x86: Make it so that __pa_symbol can only process kernel symbols on x86_64 2012-11-16 16:42:09 -08:00
page_64_types.h x86: Drop KERNEL_IMAGE_START 2013-04-02 16:03:29 -07:00
page_types.h x86, mm: Move min_pfn_mapped back to mm/init.c 2012-11-17 11:59:24 -08:00
paravirt.h Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 08:41:21 -07:00
paravirt_types.h Merge branch 'x86-paravirt-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-04-30 08:41:21 -07:00
parport.h X86: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pat.h
pci-direct.h
pci-functions.h
pci.h PCI changes for the v3.9 merge window: 2013-02-25 21:18:18 -08:00
pci_64.h
pci_x86.h PCI changes for the v3.9 merge window: 2013-02-25 21:18:18 -08:00
percpu.h x86, 386 removal: Remove CONFIG_CMPXCHG 2012-11-29 13:23:01 -08:00
perf_event.h perf/x86/amd: Enable northbridge performance counters on AMD family 15h 2013-02-16 09:37:27 +01:00
perf_event_p4.h perf/x86/intel/P4: Robistify P4 PMU types 2013-04-26 09:31:41 +02:00
pgalloc.h
pgtable-2level.h
pgtable-2level_types.h
pgtable-3level.h
pgtable-3level_types.h
pgtable.h Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-02-21 18:06:55 -08:00
pgtable_32.h x86/mm: Convert update_mmu_cache() and update_mmu_cache_pmd() to functions 2013-01-24 16:12:13 +01:00
pgtable_32_types.h
pgtable_64.h Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-02-21 18:06:55 -08:00
pgtable_64_types.h x86, 64bit: Use a #PF handler to materialize early mappings on demand 2013-01-29 15:20:06 -08:00
pgtable_types.h x86/mm/cpa: Cleanup split_large_page() and its callee 2013-04-10 14:39:08 +02:00
posix_types.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
probe_roms.h
processor-cyrix.h
processor-flags.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
processor.h x86, cpu: Convert AMD Erratum 400 2013-04-02 10:12:55 -07:00
prom.h
proto.h x86-64: don't set the early IDT to point directly to 'early_idt_handler' 2013-02-22 13:09:51 -08:00
ptrace.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-12-20 18:05:28 -08:00
pvclock-abi.h
pvclock.h x86: pvclock: generic pvclock vsyscall initialization 2012-11-27 23:29:09 -02:00
realmode.h x86, realmode: Separate real_mode reserve and setup 2013-01-29 15:13:24 -08:00
reboot.h
reboot_fixups.h
required-features.h x86: Require MOVBE feature in cpuid when we use it 2013-01-28 16:59:55 -08:00
resume-trace.h
rio.h
rtc.h
rwlock.h
rwsem.h x86 rwsem: avoid taking slow path when stealing write lock 2013-05-07 07:20:17 -07:00
scatterlist.h
seccomp.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
seccomp_32.h
seccomp_64.h
sections.h
segment.h
serial.h
setup.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
setup_arch.h
shmparam.h
sigcontext.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
sigframe.h
sighandling.h
signal.h x86: switch to generic old sigaction 2013-02-03 18:16:27 -05:00
smap.h x86, smap: Add STAC and CLAC instructions to control user space access 2012-09-21 12:45:27 -07:00
smp.h x86, hotplug: Support functions for CPU0 online/offline 2012-11-14 09:39:48 -08:00
smpboot_hooks.h
sparsemem.h
special_insns.h
spinlock.h x86/spinlocks: Fix comment in spinlock.h 2012-08-22 09:52:47 +02:00
spinlock_types.h
sta2x11.h
stackprotector.h
stacktrace.h
string.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
string_32.h
string_64.h
suspend.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
suspend_32.h x86, gdt, hibernate: Store/load GDT for hibernate path. 2013-05-02 11:27:35 -07:00
suspend_64.h x86, gdt, hibernate: Store/load GDT for hibernate path. 2013-05-02 11:27:35 -07:00
svm.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
swiotlb.h
switch_to.h
sync_bitops.h
sys_ia32.h unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
syscall.h x86: remove the x32 syscall bitmask from syscall_get_nr() 2013-04-02 14:38:09 -07:00
syscalls.h x86, vm86: fix VM86 syscalls: use SYSCALL_DEFINEx(...) 2013-05-02 20:36:32 -04:00
tce.h
thread_info.h arch: Consolidate tsk_is_polling() 2013-04-08 17:39:22 +02:00
time.h
timer.h
timex.h
tlb.h x86-32: Fix possible incomplete TLB invalidate with PAE pagetables 2013-04-12 16:56:47 -07:00
tlbflush.h x86/tlbflush.h: Define __native_flush_tlb_global_irq_disabled() 2013-01-31 13:19:16 -08:00
topology.h
trace_clock.h tracing: Format non-nanosec times from tsc clock without a decimal point. 2012-11-13 15:48:40 -05:00
traps.h
tsc.h
uaccess.h x86, doc: Clarify the use of asm("%edx") in uaccess.h 2013-02-12 15:37:02 -08:00
uaccess_32.h x86, uaccess: Merge prototypes for clear_user/__clear_user 2012-09-21 12:45:26 -07:00
uaccess_64.h x86, uaccess: Merge prototypes for clear_user/__clear_user 2012-09-21 12:45:26 -07:00
unaligned.h
unistd.h consolidate cond_syscall and SYSCALL_ALIAS declarations 2013-03-03 22:55:19 -05:00
uprobes.h uretprobes/x86: Hijack return address 2013-04-13 15:31:55 +02:00
user.h UAPI: (Scripted) Convert #include "..." to #include <path/...> in kernel system headers 2012-10-02 18:01:25 +01:00
user32.h
user_32.h
user_64.h
vdso.h x86/vdso: Add __user annotation to VDSO32_SYMBOL 2012-09-05 10:52:23 +02:00
vga.h
vgtod.h time: Convert x86_64 to using new update_vsyscall 2012-09-24 12:38:09 -04:00
virtext.h
vm86.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
vmx.h KVM: nVMX: Shadow-vmcs control fields/bits 2013-04-22 10:51:09 +03:00
vsyscall.h UAPI: (Scripted) Disintegrate arch/x86/include/asm 2012-12-14 22:37:13 +00:00
vvar.h
word-at-a-time.h
x2apic.h
x86_init.h Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-02-21 18:06:55 -08:00
xcr.h
xor.h x86/xor: Add alternative SSE implementation only prefetching once per 64-byte line 2013-01-25 09:23:50 +01:00
xor_32.h x86/xor: Add alternative SSE implementation only prefetching once per 64-byte line 2013-01-25 09:23:50 +01:00
xor_64.h x86/xor: Add alternative SSE implementation only prefetching once per 64-byte line 2013-01-25 09:23:50 +01:00
xor_avx.h x86, fpu: always use kernel_fpu_begin/end() for in-kernel FPU usage 2012-09-18 15:52:08 -07:00
xsave.h Merge branch 'x86/fpu' into x86/smap 2012-09-21 17:18:44 -07:00