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Commit 16e2011b authored by Glauber de Oliveira Costa's avatar Glauber de Oliveira Costa Committed by Ingo Molnar
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x86: allow sched clock to be overridden by paravirt 



This patch turns the sched_clock into native_sched_clock.
sched clock becomes a weak symbol, which can then give its
place to a paravirt definition.

Signed-off-by: default avatarGlauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 751de83c

arch/x86/kernel/tsc_64.c

+14 −1
Original line number Diff line number Diff line
@@ -63,7 +63,7 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu) 
	local_irq_restore(flags);

}



unsigned long long sched_clock(void)

unsigned long long native_sched_clock(void)

{

	unsigned long a = 0;
@@ -77,6 +77,19 @@ unsigned long long sched_clock(void) 
	return cycles_2_ns(a);

}



/* We need to define a real function for sched_clock, to override the

   weak default version */

#ifdef CONFIG_PARAVIRT

unsigned long long sched_clock(void)

{

	return paravirt_sched_clock();

}

#else

unsigned long long

sched_clock(void) __attribute__((alias("native_sched_clock")));

#endif





static int tsc_unstable;



inline int check_tsc_unstable(void)