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| author | Nicholas Piggin <npiggin@gmail.com> | 2018-08-07 23:21:56 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-08-14 15:36:02 +1000 |
| commit | 993ff6d9df74305bc7b5bbc7a0810cf599b6394c (patch) | |
| tree | ddf7b49a13a73306d354ebe9eb587bac250d07f0 /arch | |
| parent | a2dc009afa9ae8b92305be7728676562a104cb40 (diff) | |
| download | linux-stable-993ff6d9df74305bc7b5bbc7a0810cf599b6394c.tar.gz linux-stable-993ff6d9df74305bc7b5bbc7a0810cf599b6394c.tar.bz2 linux-stable-993ff6d9df74305bc7b5bbc7a0810cf599b6394c.zip | |
powerpc/64s: Fix PACA_IRQ_HARD_DIS accounting in idle_power4()
When idle_power4() hard disables interrupts then finds a soft pending
interrupt, it returns with interrupts hard disabled but without
PACA_IRQ_HARD_DIS set. Commit 9b81c0211c ("powerpc/64s: make
PACA_IRQ_HARD_DIS track MSR[EE] closely") added a warning for that
condition (since disabled).
Fix this by adding the PACA_IRQ_HARD_DIS for that case.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/idle_power4.S | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/idle_power4.S b/arch/powerpc/kernel/idle_power4.S index dd7471fe20bd..a09b3c7ca176 100644 --- a/arch/powerpc/kernel/idle_power4.S +++ b/arch/powerpc/kernel/idle_power4.S @@ -32,6 +32,8 @@ END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP) cmpwi 0,r4,0 beqlr + /* This sequence is similar to prep_irq_for_idle() */ + /* Hard disable interrupts */ mfmsr r7 rldicl r0,r7,48,1 @@ -41,10 +43,15 @@ END_FTR_SECTION_IFCLR(CPU_FTR_CAN_NAP) /* Check if something happened while soft-disabled */ lbz r0,PACAIRQHAPPENED(r13) cmpwi cr0,r0,0 - bnelr + bne- 2f - /* Soft-enable interrupts */ + /* + * Soft-enable interrupts. This will make power4_fixup_nap return + * to our caller with interrupts enabled (soft and hard). The caller + * can cope with either interrupts disabled or enabled upon return. + */ #ifdef CONFIG_TRACE_IRQFLAGS + /* Tell the tracer interrupts are on, because idle responds to them. */ mflr r0 std r0,16(r1) stdu r1,-128(r1) @@ -73,3 +80,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC) isync b 1b +2: /* Return if an interrupt had happened while soft disabled */ + /* Set the HARD_DIS flag because interrupts are now hard disabled */ + ori r0,r0,PACA_IRQ_HARD_DIS + stb r0,PACAIRQHAPPENED(r13) + blr |