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Handle the race in cpu_idle() when due to the critical section CPU could get

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into sleep after receiving interrupt, delaying interrupt thread execution
indefinitely until the next interrupt arrive.

Reviewed by:	nwhitehorn
MFC after:	3 days
This commit is contained in:
Alexander Motin 2011-09-29 14:19:34 +00:00
parent 5f8ad41c0d
commit 9081a9b2c3
1 changed files with 10 additions and 0 deletions
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10
sys/powerpc/powerpc/cpu.c
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@ -553,6 +553,11 @@ cpu_idle_60x(void)
vers = mfpvr() >> 16; vers = mfpvr() >> 16;
#ifdef AIM #ifdef AIM
mtmsr(msr & ~PSL_EE);
if (sched_runnable()) {
mtmsr(msr);
return;
}
switch (vers) { switch (vers) {
case IBM970: case IBM970:
case IBM970FX: case IBM970FX:
@ -583,6 +588,11 @@ cpu_idle_e500(void)
msr = mfmsr(); msr = mfmsr();
#ifdef E500 #ifdef E500
mtmsr(msr & ~PSL_EE);
if (sched_runnable()) {
mtmsr(msr);
return;
}
/* Freescale E500 core RM section 6.4.1. */ /* Freescale E500 core RM section 6.4.1. */
__asm __volatile("msync; mtmsr %0; isync" :: __asm __volatile("msync; mtmsr %0; isync" ::
"r" (msr | PSL_WE)); "r" (msr | PSL_WE));