Author: mav
Date: Thu Sep 29 14:19:34 2011
New Revision: 225875
URL: http://svn.freebsd.org/changeset/base/225875
Log:
Handle the race in cpu_idle() when due to the critical section CPU could get
into sleep after receiving interrupt, delaying interrupt thread execution
indefinitely until the next interrupt arrive.
Reviewed by: nwhitehorn
MFC after: 3 days
Modified:
head/sys/powerpc/powerpc/cpu.c
Modified: head/sys/powerpc/powerpc/cpu.c
==============================================================================
--- head/sys/powerpc/powerpc/cpu.c Thu Sep 29 10:42:51 2011
(r225874)
+++ head/sys/powerpc/powerpc/cpu.c Thu Sep 29 14:19:34 2011
(r225875)
@@ -553,6 +553,11 @@ cpu_idle_60x(void)
vers = mfpvr() >> 16;
#ifdef AIM
+ mtmsr(msr & ~PSL_EE);
+ if (sched_runnable()) {
+ mtmsr(msr);
+ return;
+ }
switch (vers) {
case IBM970:
case IBM970FX:
@@ -583,6 +588,11 @@ cpu_idle_e500(void)
msr = mfmsr();
#ifdef E500
+ mtmsr(msr & ~PSL_EE);
+ if (sched_runnable()) {
+ mtmsr(msr);
+ return;
+ }
/* Freescale E500 core RM section 6.4.1. */
__asm __volatile("msync; mtmsr %0; isync" ::
"r" (msr | PSL_WE));
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