Commit f06e4ec1 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: read_tsc sync 



make native_read_tsc() always non-speculative.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent e4026440

arch/x86/kernel/rtc.c

+3 −0
Original line number Diff line number Diff line
@@ -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);