diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2020-02-07 13:38:48 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-02-17 14:40:19 +0100 |
| commit | 50e818715821b89c7abac90a97721f106e893d83 (patch) | |
| tree | 932db5da142dc5bc5a354bbf0b301b7919e67d8f | |
| parent | 11a48a5a18c63fd7621bb050228cebf13566e4d8 (diff) | |
x86/vdso: Mark the TSC clocksource path likely
Jumping out of line for the TSC clcoksource read is creating awful
code. TSC is likely to be the clocksource at least on bare metal and the PV
interfaces are sufficiently more work that the jump over the TSC read is
just in the noise.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Link: https://lkml.kernel.org/r/20200207124402.328922847@linutronix.de
| -rw-r--r-- | arch/x86/include/asm/vdso/gettimeofday.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/vdso/gettimeofday.h b/arch/x86/include/asm/vdso/gettimeofday.h index 6ee1f7dba34b..264d4fd3ff2c 100644 --- a/arch/x86/include/asm/vdso/gettimeofday.h +++ b/arch/x86/include/asm/vdso/gettimeofday.h @@ -243,7 +243,7 @@ static u64 vread_hvclock(void) static inline u64 __arch_get_hw_counter(s32 clock_mode) { - if (clock_mode == VCLOCK_TSC) + if (likely(clock_mode == VCLOCK_TSC)) return (u64)rdtsc_ordered(); /* * For any memory-mapped vclock type, we need to make sure that gcc |