From 16e2011be67b8625c1c600f9742c2279be3c0c68 Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Wed, 30 Jan 2008 13:31:03 +0100 Subject: [PATCH] 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 Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/tsc_64.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/tsc_64.c b/arch/x86/kernel/tsc_64.c index 32edd2c50e9..204a9080af0 100644 --- a/arch/x86/kernel/tsc_64.c +++ b/arch/x86/kernel/tsc_64.c @@ -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) -- 2.41.1