Commit 50e81871 authored Feb 07, 2020 by Thomas Gleixner

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

parent 11a48a5a

arch/x86/include/asm/vdso/gettimeofday.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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

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