diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2017-07-19 08:59:12 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-08-31 06:26:04 +0200 |
| commit | b96672dd840f2231c3e0804842d380c401739733 (patch) | |
| tree | f3ac7fc5ba4f7d47a84874998ae6987fc72ac77b /arch/powerpc/kernel | |
| parent | powerpc/powernv: Use kernel crash path for machine checks (diff) | |
| download | linux-b96672dd840f2231c3e0804842d380c401739733.tar.xz linux-b96672dd840f2231c3e0804842d380c401739733.zip | |
powerpc: Machine check interrupt is a non-maskable interrupt
Use nmi_enter similarly to system reset interrupts. This uses NMI
printk NMI buffers and turns off various debugging facilities that
helps avoid tripping on ourselves or other CPUs.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/traps.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index 6858d910b47e..ec74e203ee04 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -644,8 +644,10 @@ int machine_check_generic(struct pt_regs *regs) void machine_check_exception(struct pt_regs *regs) { - enum ctx_state prev_state = exception_enter(); int recover = 0; + bool nested = in_nmi(); + if (!nested) + nmi_enter(); /* 64s accounts the mce in machine_check_early when in HVMODE */ if (!IS_ENABLED(CONFIG_PPC_BOOK3S_64) || !cpu_has_feature(CPU_FTR_HVMODE)) @@ -677,10 +679,11 @@ void machine_check_exception(struct pt_regs *regs) /* Must die if the interrupt is not recoverable */ if (!(regs->msr & MSR_RI)) - panic("Unrecoverable Machine check"); + nmi_panic(regs, "Unrecoverable Machine check"); bail: - exception_exit(prev_state); + if (!nested) + nmi_exit(); } void SMIException(struct pt_regs *regs) |