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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
This commit is contained in:
Thomas Gleixner 2020-02-07 13:38:48 +01:00
parent 11a48a5a18
commit 50e8187158
1 changed files with 1 additions and 1 deletions
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2
arch/x86/include/asm/vdso/gettimeofday.h
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@ -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