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x86: quick TSC calibration, improve
author
Ingo Molnar <mingo@elte.hu>
Thu, 4 Sep 2008 20:47:47 +0000
(22:47 +0200)
committer
Ingo Molnar <mingo@elte.hu>
Thu, 4 Sep 2008 21:21:57 +0000
(23:21 +0200)
- make sure the final TSC timestamp is reliable too
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/tsc.c
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diff --git
a/arch/x86/kernel/tsc.c
b/arch/x86/kernel/tsc.c
index
839070b
..
6dab90f
100644
(file)
--- a/
arch/x86/kernel/tsc.c
+++ b/
arch/x86/kernel/tsc.c
@@
-317,6
+317,12
@@
static unsigned long quick_pit_calibrate(void)
t2 = get_cycles();
/*
+ * Make sure we can rely on the second TSC timestamp:
+ */
+ if (!pit_expect_msb(--expect))
+ goto failed;
+
+ /*
* Ok, if we get here, then we've seen the
* MSB of the PIT decrement QUICK_PIT_ITERATIONS
* times, and each MSB had many hits, so we never