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idle_loop: explicitly go to spl0() to sidestep potential MD bugs.

This commit is contained in:
ad 2009-06-28 09:25:05 +00:00
parent 6cdc8b7df8
commit 5b4feac126
1 changed files with 9 additions and 5 deletions
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14
sys/kern/kern_idle.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_idle.c,v 1.21 2008/06/11 13:42:02 ad Exp $ */
/* $NetBSD: kern_idle.c,v 1.22 2009/06/28 09:25:05 ad Exp $ */
/*-
* Copyright (c)2002, 2006, 2007 YAMAMOTO Takashi,
@ -28,7 +28,7 @@
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_idle.c,v 1.21 2008/06/11 13:42:02 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_idle.c,v 1.22 2009/06/28 09:25:05 ad Exp $");
#include <sys/param.h>
#include <sys/cpu.h>
@ -48,7 +48,6 @@ idle_loop(void *dummy)
struct cpu_info *ci = curcpu();
struct schedstate_percpu *spc;
struct lwp *l = curlwp;
int s;
ci->ci_data.cpu_onproc = l;
@ -57,10 +56,15 @@ idle_loop(void *dummy)
binuptime(&l->l_stime);
lwp_unlock(l);
/*
* Use spl0() here to ensure that we have the correct interrupt
* priority. This may be the first thread running on the CPU,
* in which case we took a dirtbag route to get here.
*/
spc = &ci->ci_schedstate;
s = splsched();
(void)splsched();
spc->spc_flags |= SPCF_RUNNING;
splx(s);
spl0();
KERNEL_UNLOCK_ALL(l, NULL);
l->l_stat = LSONPROC;