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>
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 6858d91..ec74e20 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -644,8 +644,10 @@
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 @@
/* 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)