x86: clean up rdtsc_barrier() use

Impact: cleanup

Move rdtsc_barrier() use to vsyscall_64.c where it's relied on,
and point out its role in the context of its use.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 5 deletions

diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index 9cd83a8e40d5..700aeb8d2098 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -44,11 +44,7 @@ static __always_inline cycles_t vget_cycles(void)
         if (!cpu_has_tsc)
                 return 0;
 #endif
-        rdtsc_barrier();
-        cycles = (cycles_t)__native_read_tsc();
-        rdtsc_barrier();
-
-        return cycles;
+        return (cycles_t)__native_read_tsc();
 }
 
 extern void tsc_init(void);