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x86: read_tsc sync 

make native_read_tsc() always non-speculative.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-01-30 13:32:39 +01:00
parent e402644013
commit f06e4ec1c1
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/rtc.c
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@ -200,7 +200,10 @@ unsigned long long __vsyscall_fn native_read_tsc(void)
{ {
DECLARE_ARGS(val, low, high); DECLARE_ARGS(val, low, high);
rdtsc_barrier();
asm volatile("rdtsc" : EAX_EDX_RET(val, low, high)); asm volatile("rdtsc" : EAX_EDX_RET(val, low, high));
rdtsc_barrier();
return EAX_EDX_VAL(val, low, high); return EAX_EDX_VAL(val, low, high);
} }
EXPORT_SYMBOL_GPL(native_read_tsc); EXPORT_SYMBOL_GPL(native_read_tsc);