Author: kib
Date: Sun Aug 13 14:42:23 2017
New Revision: 322456
URL: https://svnweb.freebsd.org/changeset/base/322456
Log:
Fix a regression in r321608.
On i386 with CPUID but without SSE2, set lfence_works to LMB_NONE
instead of looping.
Reported and tested by: Andre Albsmeier <an...@fbsd.e4m.org>
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Modified:
head/lib/libc/x86/sys/__vdso_gettc.c
Modified: head/lib/libc/x86/sys/__vdso_gettc.c
==============================================================================
--- head/lib/libc/x86/sys/__vdso_gettc.c Sun Aug 13 14:36:10 2017
(r322455)
+++ head/lib/libc/x86/sys/__vdso_gettc.c Sun Aug 13 14:42:23 2017
(r322456)
@@ -101,6 +101,7 @@ init_fence(void)
#if defined(__i386__)
u_int cpuid_supported, p[4];
+ lfence_works = LMB_NONE;
__asm __volatile(
" pushfl\n"
" popl %%eax\n"
@@ -121,8 +122,7 @@ init_fence(void)
cpuidp(0x1, p);
if ((p[3] & CPUID_SSE2) != 0)
lfence_works = select_lmb();
- } else
- lfence_works = LMB_NONE;
+ }
#elif defined(__amd64__)
lfence_works = select_lmb();
#else
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