diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2017-11-17 02:00:50 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-12-11 13:03:34 +1100 |
| commit | acb1feab320e38588fccc568e3767761f494976f (patch) | |
| tree | a39fcc7d2f6e0cfa3517691032cfe8a65819b12d | |
| parent | 7813043e1bbcea764c86ef2fcf43aeae2b0e240d (diff) | |
powerpc/64: Don't trace irqs-off at interrupt return to soft-disabled context
When an interrupt is returning to a soft-disabled context (which can
happen for non-maskable interrupts or synchronous interrupts), it goes
through the motions of soft-disabling again, including calling
TRACE_DISABLE_INTS (i.e., trace_hardirqs_off()).
This is not necessary, because we must already be soft-disabled in the
interrupt context, it also may be causing crashes in the irq tracing
code to re-enter as an nmi. Replace it with a warning to ensure that
soft-interrupts are still disabled.
Fixes: 7c0482e3d055 ("powerpc/irq: Fix another case of lazy IRQ state getting out of sync")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 3320bcac7192..36878b6ee8b8 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -911,9 +911,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) beq 1f rlwinm r7,r7,0,~PACA_IRQ_HARD_DIS stb r7,PACAIRQHAPPENED(r13) -1: li r0,0 - stb r0,PACASOFTIRQEN(r13); - TRACE_DISABLE_INTS +1: +#if defined(CONFIG_TRACE_IRQFLAGS) && defined(CONFIG_BUG) + /* The interrupt should not have soft enabled. */ + lbz r7,PACASOFTIRQEN(r13) +1: tdnei r7,0 + EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,BUGFLAG_WARNING +#endif b .Ldo_restore /* |