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| author | Dave Airlie <airlied@redhat.com> | 2017-08-15 09:16:58 +0300 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2017-08-15 09:16:58 +0300 |
| commit | 0c697fafc66830ca7d5dc19123a1d0641deaa1f6 (patch) | |
| tree | c56336719ca8de16f78ada78e606dffa471e47d5 /arch/powerpc/kernel/exceptions-64s.S | |
| parent | 09ef2378dc42339f3871584dc26d27da220277cb (diff) | |
| parent | ef954844c7ace62f773f4f23e28d2d915adc419f (diff) | |
| download | linux-0c697fafc66830ca7d5dc19123a1d0641deaa1f6.tar.xz | |
Backmerge tag 'v4.13-rc5' into drm-next
Linux 4.13-rc5
There's a really nasty nouveau collision, hopefully someone can take a look
once I pushed this out.
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 9029afd1fa2a..f14f3c04ec7e 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -1325,10 +1325,18 @@ EXC_VIRT_NONE(0x5800, 0x100) std r10,PACA_EXGEN+EX_R13(r13); \ EXCEPTION_PROLOG_PSERIES_1(soft_nmi_common, _H) +/* + * Branch to soft_nmi_interrupt using the emergency stack. The emergency + * stack is one that is usable by maskable interrupts so long as MSR_EE + * remains off. It is used for recovery when something has corrupted the + * normal kernel stack, for example. The "soft NMI" must not use the process + * stack because we want irq disabled sections to avoid touching the stack + * at all (other than PMU interrupts), so use the emergency stack for this, + * and run it entirely with interrupts hard disabled. + */ EXC_COMMON_BEGIN(soft_nmi_common) mr r10,r1 ld r1,PACAEMERGSP(r13) - ld r1,PACA_NMI_EMERG_SP(r13) subi r1,r1,INT_FRAME_SIZE EXCEPTION_COMMON_NORET_STACK(PACA_EXGEN, 0x900, system_reset, soft_nmi_interrupt, |