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Subject[PATCH 3/10] allow sched clock to be overridden by paravirt
Date
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>
---
arch/x86/kernel/tsc_64.c | 15 ++++++++++++++-
1 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/tsc_64.c b/arch/x86/kernel/tsc_64.c
index 9c70af4..5158476 100644
--- a/arch/x86/kernel/tsc_64.c
+++ b/arch/x86/kernel/tsc_64.c
@@ -30,7 +30,7 @@ static unsigned long long cycles_2_ns(unsigned long long cyc)
return (cyc * cyc2ns_scale) >> NS_SCALE;
}

-unsigned long long sched_clock(void)
+unsigned long long native_sched_clock(void)
{
unsigned long a = 0;

@@ -44,6 +44,19 @@ 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)
--
1.4.4.2


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