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PR kern/38537 __HAVE_PREEMPTION requires MULTIPROCESSOR 

Don't patch out the kernel_lock functions if ncpu == 1. We need it for
preemption, and it's used much less frequently than before.
This commit is contained in:
ad 2008-04-30 00:05:20 +00:00
parent e3610f1886
commit 5d794f8931
1 changed files with 2 additions and 12 deletions
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14
sys/arch/x86/x86/patch.c
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@ -1,4 +1,4 @@
/* $NetBSD: patch.c,v 1.12 2008/04/28 20:23:40 martin Exp $ */
/* $NetBSD: patch.c,v 1.13 2008/04/30 00:05:20 ad Exp $ */
/*-
* Copyright (c) 2007 The NetBSD Foundation, Inc.
@ -34,7 +34,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: patch.c,v 1.12 2008/04/28 20:23:40 martin Exp $");
__KERNEL_RCSID(0, "$NetBSD: patch.c,v 1.13 2008/04/30 00:05:20 ad Exp $");
#include "opt_lockdebug.h"
@ -146,16 +146,6 @@ x86_patch(void)
patchbytes(x86_lockpatch[i], X86_NOP, -1);
for (i = 0; atomic_lockpatch[i] != 0; i++)
patchbytes(atomic_lockpatch[i], X86_NOP, -1);
/*
* Uniprocessor: kill kernel_lock. Fill another
* 14 bytes of NOPs so not to confuse the decoder.
*/
patchbytes(_kernel_lock, X86_NOP, X86_RET);
patchbytes(_kernel_unlock, X86_NOP, X86_RET);
for (i = 2; i < 16; i++) {
patchbytes((char *)_kernel_lock + i, X86_NOP, -1);
patchbytes((char *)_kernel_unlock + i, X86_NOP, -1);
}
#endif
} else if ((cpu_feature & CPUID_SSE2) != 0) {
/* Faster memory barriers. */