The patch titled
x86_64: fix last_tsc calculation of PM timer
has been removed from the -mm tree. Its filename is
x86_64-fix-last_tsc-calculation-of-pm-timer.patch
This patch was probably dropped from -mm because
it has now been merged into a subsystem tree or
into Linus's tree, or because it was folded into
its parent patch in the -mm tree.
------------------------------------------------------
Subject: x86_64: fix last_tsc calculation of PM timer
From: "Jan Beulich" <jbeulich@xxxxxxxxxx>
The PM timer code updates vxtime.last_tsc, but this update was done
incorrectly in two ways:
- offset_delay being in microseconds requires multiplying with cpu_mhz
rather than cpu_khz
- the multiplication of offset_delay and cpu_khz (both being 32-bit
values) on most current CPUs would overflow (observed value of the
delay was approximately 4000us, yielding an overflow for frequencies
starting a little above 1GHz)
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/x86_64/kernel/pmtimer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN arch/x86_64/kernel/pmtimer.c~x86_64-fix-last_tsc-calculation-of-pm-timer arch/x86_64/kernel/pmtimer.c
--- devel/arch/x86_64/kernel/pmtimer.c~x86_64-fix-last_tsc-calculation-of-pm-timer 2006-05-30 21:24:55.000000000 -0700
+++ devel-akpm/arch/x86_64/kernel/pmtimer.c 2006-05-30 21:24:55.000000000 -0700
@@ -68,7 +68,7 @@ int pmtimer_mark_offset(void)
offset_delay = delta % (USEC_PER_SEC / HZ);
rdtscll(tsc);
- vxtime.last_tsc = tsc - offset_delay * cpu_khz;
+ vxtime.last_tsc = tsc - offset_delay * (u64)cpu_khz / 1000;
/* don't calculate delay for first run,
or if we've got less then a tick */
_
Patches currently in -mm which might be from jbeulich@xxxxxxxxxx are
origin.patch
dprintk-adjustments-to-cpufreq-nforce2.patch
dprintk-adjustments-to-cpufreq-speedstep-centrino.patch
cpufreq-dprintk-adjustments.patch
fix-recovery-path-from-errors-during-pcie_init.patch
mpt_interrupt-should-return-irq_none-when.patch
fix-x86-microcode-driver-handling-of-multiple-matching.patch
vdso-randomize-the-i386-vdso-by-moving-it-into-a-vma-vs-x86_64-mm-reliable-stack-trace-support-i386.patch
vdso-randomize-the-i386-vdso-by-moving-it-into-a-vma-vs-x86_64-mm-reliable-stack-trace-support-i386-2.patch
adjust-handle_irr_event-return-type.patch
lock-validator-irqtrace-cleanup-include-asm-x86_64-irqflagsh.patch
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
