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[PATCH] x86_64: Add cpu_relax() to busy loops in PM timer code 

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2006-03-25 16:32:04 +01:00 committed by Linus Torvalds
parent 6a0f03e0d3
commit c36cd16f78
1 changed files with 2 additions and 1 deletions
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3
arch/x86_64/kernel/pmtimer.c
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@ -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);
}