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: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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1 changed files with 14 additions and 1 deletions
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@ -63,7 +63,7 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
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local_irq_restore(flags);
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}
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unsigned long long sched_clock(void)
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unsigned long long native_sched_clock(void)
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{
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unsigned long a = 0;
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@ -77,6 +77,19 @@ unsigned long long sched_clock(void)
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return cycles_2_ns(a);
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}
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/* We need to define a real function for sched_clock, to override the
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weak default version */
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#ifdef CONFIG_PARAVIRT
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unsigned long long sched_clock(void)
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{
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return paravirt_sched_clock();
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}
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#else
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unsigned long long
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sched_clock(void) __attribute__((alias("native_sched_clock")));
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#endif
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static int tsc_unstable;
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inline int check_tsc_unstable(void)
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