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[PATCH] x86_64: Add cpu_relax() to busy loops in PM timer code
author
Andi Kleen
<ak@suse.de>
Sat, 25 Mar 2006 15:32:04 +0000
(16:32 +0100)
committer
Linus Torvalds
<torvalds@g5.osdl.org>
Sat, 25 Mar 2006 17:14:39 +0000
(09:14 -0800)
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
arch/x86_64/kernel/pmtimer.c
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diff --git
a/arch/x86_64/kernel/pmtimer.c
b/arch/x86_64/kernel/pmtimer.c
index
5c51d10
..
ee5ee48
100644
(file)
--- a/
arch/x86_64/kernel/pmtimer.c
+++ b/
arch/x86_64/kernel/pmtimer.c
@@
-86,7
+86,7
@@
static unsigned pmtimer_wait_tick(void)
for (a = b = inl(pmtmr_ioport) & ACPI_PM_MASK;
a == b;
b = inl(pmtmr_ioport) & ACPI_PM_MASK)
- ;
+
cpu_relax()
;
return b;
}
@@
-97,6
+97,7
@@
void pmtimer_wait(unsigned us)
a = pmtimer_wait_tick();
do {
b = inl(pmtmr_ioport);
+ cpu_relax();
} while (cyc2us(b - a) < us);
}