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powerpc/64s: Fix PACA_IRQ_HARD_DIS accounting in idle_power4()

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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>
This commit is contained in:
Nicholas Piggin 2018-08-07 23:21:56 +10:00 committed by Michael Ellerman
parent a2dc009afa
commit 993ff6d9df
1 changed files with 14 additions and 2 deletions
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16
arch/powerpc/kernel/idle_power4.S
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@ -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