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cpu_intr_p(): use cpuinfo (always the same VA) for preemption safety.

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This commit is contained in:
ad 2020-03-22 21:21:07 +00:00
parent e36e7c169a
commit 81dc2a2cd1
1 changed files with 7 additions and 14 deletions
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21
sys/arch/sparc/sparc/intr.c
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@ -1,4 +1,4 @@
/* $NetBSD: intr.c,v 1.124 2020/03/14 13:34:43 ad Exp $ */
/* $NetBSD: intr.c,v 1.125 2020/03/22 21:21:07 ad Exp $ */
/*
* Copyright (c) 1992, 1993
@ -41,7 +41,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.124 2020/03/14 13:34:43 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: intr.c,v 1.125 2020/03/22 21:21:07 ad Exp $");
#include "opt_multiprocessor.h"
#include "opt_sparc_arch.h"
@ -889,17 +889,10 @@ intr_biglock_wrapper(void *vp)
bool
cpu_intr_p(void)
{
uint64_t ncsw;
int idepth;
lwp_t *l;
l = curlwp;
do {
ncsw = l->l_ncsw;
__insn_barrier();
idepth = curcpu()->ci_idepth;
__insn_barrier();
} while (__predict_false(ncsw != l->l_ncsw));
return idepth != 0;
/*
* cpuinfo is the same VA on every CPU. Even if preempted it will
* give the correct answer.
*/
return cpuinfo.ci_idepth != 0;
}