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Disable kernel preemption in the critical section of cpu_switchto()

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This commit is contained in:
reinoud 2011-09-05 12:22:19 +00:00
parent 66a2e2bc4b
commit ebe91428da
1 changed files with 6 additions and 2 deletions
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8
sys/arch/usermode/dev/cpu.c
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@ -1,4 +1,4 @@
/* $NetBSD: cpu.c,v 1.29 2011/09/04 21:01:39 reinoud Exp $ */
/* $NetBSD: cpu.c,v 1.30 2011/09/05 12:22:19 reinoud Exp $ */
/*-
* Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca>
@ -29,7 +29,7 @@
#include "opt_cpu.h"
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.29 2011/09/04 21:01:39 reinoud Exp $");
__KERNEL_RCSID(0, "$NetBSD: cpu.c,v 1.30 2011/09/05 12:22:19 reinoud Exp $");
#include <sys/param.h>
#include <sys/conf.h>
@ -184,6 +184,8 @@ cpu_switchto(lwp_t *oldlwp, lwp_t *newlwp, bool returning)
}
#endif /* !CPU_DEBUG */
kpreempt_disable();
ci->ci_stash = oldlwp;
curlwp = newlwp;
@ -197,6 +199,8 @@ cpu_switchto(lwp_t *oldlwp, lwp_t *newlwp, bool returning)
}
thunk_seterrno(newpcb->pcb_errno);
kpreempt_enable();
#ifdef CPU_DEBUG
printf("cpu_switchto: returning %p (was %p)\n", ci->ci_stash, oldlwp);
#endif