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Fix a regression in r321608.

Browse source 
On i386 with CPUID but without SSE2, set lfence_works to LMB_NONE
instead of looping.

Reported and tested by:	Andre Albsmeier <andre@fbsd.e4m.org>
Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
This commit is contained in:
Konstantin Belousov 2017-08-13 14:42:23 +00:00
parent 413bf7b083
commit b1cbddaf5d
1 changed files with 2 additions and 2 deletions
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4
lib/libc/x86/sys/__vdso_gettc.c
View file

@ -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