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authorIngo Molnar <mingo@elte.hu>2008-01-30 13:32:39 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:32:39 +0100
commitf06e4ec1c15691b0cfd2397ae32214fa36c90d71 (patch)
treed8191c516d3d9823c6d7a0e4ec0636137aa7fd61 /arch/x86/kernel/rtc.c
parente4026440130b84101f2da7f5a0c7a3b046173d3c (diff)
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>
Diffstat (limited to 'arch/x86/kernel/rtc.c')
-rw-r--r--arch/x86/kernel/rtc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index c42cf126388..276cb7073ab 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -200,7 +200,10 @@ unsigned long long __vsyscall_fn native_read_tsc(void)
{
DECLARE_ARGS(val, low, high);
+ rdtsc_barrier();
asm volatile("rdtsc" : EAX_EDX_RET(val, low, high));
+ rdtsc_barrier();
+
return EAX_EDX_VAL(val, low, high);
}
EXPORT_SYMBOL_GPL(native_read_tsc);