diff options
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 555b3d0a3f38..03727308d8cc 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -117,13 +117,12 @@ BEGIN_FTR_SECTION END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) /* - * RECONCILE_IRQ_STATE without calling trace_hardirqs_off(), which - * would clobber syscall parameters. Also we always enter with IRQs - * enabled and nothing pending. system_call_exception() will call - * trace_hardirqs_off(). - * - * scv enters with MSR[EE]=1, so don't set PACA_IRQ_HARD_DIS. The - * entry vector already sets PACAIRQSOFTMASK to IRQS_ALL_DISABLED. + * scv enters with MSR[EE]=1 and is immediately considered soft-masked. + * The entry vector already sets PACAIRQSOFTMASK to IRQS_ALL_DISABLED, + * and interrupts may be masked and pending already. + * system_call_exception() will call trace_hardirqs_off() which means + * interrupts could already have been blocked before trace_hardirqs_off, + * but this is the best we can do. */ /* Calling convention has r9 = orig r0, r10 = regs */ @@ -288,9 +287,8 @@ END_BTB_FLUSH_SECTION std r11,-16(r10) /* "regshere" marker */ /* - * RECONCILE_IRQ_STATE without calling trace_hardirqs_off(), which - * would clobber syscall parameters. Also we always enter with IRQs - * enabled and nothing pending. system_call_exception() will call + * We always enter kernel from userspace with irq soft-mask enabled and + * nothing pending. system_call_exception() will call * trace_hardirqs_off(). */ li r11,IRQS_ALL_DISABLED |