diff options
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index d7a79b1f3c65..3ddabac6ede6 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -934,18 +934,19 @@ EXC_COMMON_BEGIN(system_reset_common) __GEN_COMMON_BODY system_reset bl save_nvgprs /* - * Set IRQS_ALL_DISABLED unconditionally so arch_irqs_disabled does + * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does * the right thing. We do not want to reconcile because that goes * through irq tracing which we don't want in NMI. * - * Save PACAIRQHAPPENED because some code will do a hard disable - * (e.g., xmon). So we want to restore this back to where it was - * when we return. DAR is unused in the stack, so save it there. + * Save PACAIRQHAPPENED to _DAR (otherwise unused), and set HARD_DIS + * as we are running with MSR[EE]=0. */ li r10,IRQS_ALL_DISABLED stb r10,PACAIRQSOFTMASK(r13) lbz r10,PACAIRQHAPPENED(r13) std r10,_DAR(r1) + ori r10,r10,PACA_IRQ_HARD_DIS + stb r10,PACAIRQHAPPENED(r13) addi r3,r1,STACK_FRAME_OVERHEAD bl system_reset_exception @@ -990,6 +991,11 @@ EXC_COMMON_BEGIN(system_reset_common) * error detected there), determines if it was recoverable and logs the * event. * + * This early code does not "reconcile" irq soft-mask state like SRESET or + * regular interrupts do, so irqs_disabled() among other things may not work + * properly (irq disable/enable already doesn't work because irq tracing can + * not work in real mode). + * * Then, depending on the execution context when the interrupt is taken, there * are 3 main actions: * - Executing in kernel mode. The event is queued with irq_work, which means |