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powerpc/64s/idle: Run latch switch is done with MSR[EE]=0

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In the idle sleep/wake code we know that MSR[EE] is clear, so we can
avoid 2 x mfmsr and 2 x mtmsr by calling the double-underscore
versions of the run latch routines which assume interrupts are already
disabled.

Acked-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-06-13 23:05:57 +10:00 committed by Michael Ellerman
parent 95acdc0712
commit 40d24343a8
1 changed files with 6 additions and 6 deletions
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12
arch/powerpc/platforms/powernv/idle.c
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@ -291,9 +291,9 @@ static unsigned long __power7_idle_type(unsigned long type)
if (!prep_irq_for_idle_irqsoff())
return 0;
ppc64_runlatch_off();
__ppc64_runlatch_off();
srr1 = power7_idle_insn(type);
ppc64_runlatch_on();
__ppc64_runlatch_on();
fini_irq_for_idle_irqsoff();
@ -328,9 +328,9 @@ static unsigned long __power9_idle_type(unsigned long stop_psscr_val,
psscr = mfspr(SPRN_PSSCR);
psscr = (psscr & ~stop_psscr_mask) | stop_psscr_val;
ppc64_runlatch_off();
__ppc64_runlatch_off();
srr1 = power9_idle_stop(psscr);
ppc64_runlatch_on();
__ppc64_runlatch_on();
fini_irq_for_idle_irqsoff();
@ -365,7 +365,7 @@ unsigned long pnv_cpu_offline(unsigned int cpu)
unsigned long srr1;
u32 idle_states = pnv_get_supported_cpuidle_states();
ppc64_runlatch_off();
__ppc64_runlatch_off();
if (cpu_has_feature(CPU_FTR_ARCH_300) && deepest_stop_found) {
unsigned long psscr;
@ -392,7 +392,7 @@ unsigned long pnv_cpu_offline(unsigned int cpu)
HMT_medium();
}
ppc64_runlatch_on();
__ppc64_runlatch_on();
return srr1;
}