The patch titled
x86_64: remove pit synchronization
has been added to the -mm tree. Its filename is
x86_64-apic-remove-bogus-pit-synchronization.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: x86_64: remove pit synchronization
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
The APIC timer setup code synchronizes the local APIC timer to the PIT/HPET.
This is pointless as the PIT and the local APIC timer frequency are not
correlated and the APIC timer calibration can never be accurate enough to
avoid that the local APIC timer and the PIT/HPET drift apart.
Simply remove it.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: john stultz <johnstul@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86_64/kernel/apic.c | 18 ------------------
1 files changed, 18 deletions(-)
diff -puN arch/x86_64/kernel/apic.c~x86_64-apic-remove-bogus-pit-synchronization arch/x86_64/kernel/apic.c
--- a/arch/x86_64/kernel/apic.c~x86_64-apic-remove-bogus-pit-synchronization
+++ a/arch/x86_64/kernel/apic.c
@@ -794,24 +794,6 @@ static void setup_APIC_timer(unsigned in
local_irq_save(flags);
- /* wait for irq slice */
- if (hpet_address && hpet_use_timer) {
- u32 trigger = hpet_readl(HPET_T0_CMP);
- while (hpet_readl(HPET_T0_CMP) == trigger)
- /* do nothing */ ;
- } else {
- int c1, c2;
- outb_p(0x00, 0x43);
- c2 = inb_p(0x40);
- c2 |= inb_p(0x40) << 8;
- do {
- c1 = c2;
- outb_p(0x00, 0x43);
- c2 = inb_p(0x40);
- c2 |= inb_p(0x40) << 8;
- } while (c2 - c1 < 300);
- }
-
irqen = ! cpu_isset(smp_processor_id(),
timer_interrupt_broadcast_ipi_mask);
__setup_APIC_LVTT(clocks, 0, irqen);
_
Patches currently in -mm which might be from tglx@xxxxxxxxxxxxx are
origin.patch
sigqueue_free-fix-the-race-with-collect_signal.patch
git-acpi.patch
geode-mfgpt-support-for-geode-class-machines.patch
geode-mfgpt-clock-event-device-support.patch
clockevents-remove-unused-inline-function.patch
clockevents-allow-build-without-runtime-use.patch
x86_64-consolidate-tsc-calibration.patch
i386-prepare-sharing-hpet-code.patch
i386-hpet-add-x8664-hpet-bits.patch
i386-prepare-sharing-pit-code.patch
x86_64-use-i386-i8253-h.patch
x86_64-preparatory-apic-set-lvtt.patch
x86_64-apic-remove-bogus-pit-synchronization.patch
x86_64-apic-shuffle-calibration-around.patch
x86_64-apic-calibration-remove-divisor.patch
x86_64-apic-change-setup-calling-convention.patch
x86_64-apic-remove-nested-irq-disable.patch
x86_64-prep-idle-loop-for-dynticks.patch
x86_64-apic-add-clockevents-functions.patch
x86_64-convert-to-clockevents.patch
x86_64-remove-unused-code.patch
x86_64-cleanup-apic-c.patch
jiffies-remove-unused-macros.patch
acpi-remove-the-useless-ifdef-code.patch
i386-pit-remove-the-useless-ifdefs.patch
i386-hpet-sharing-optimize.patch
ich-force-hpet-make-generic-time-capable-of-switching-broadcast-timer.patch
ich-force-hpet-restructure-hpet-generic-clock-code.patch
ich-force-hpet-ich7-or-later-quirk-to-force-detect-enable.patch
ich-force-hpet-ich7-or-later-quirk-to-force-detect-enable-fix.patch
ich-force-hpet-late-initialization-of-hpet-after-quirk.patch
ich-force-hpet-ich5-quirk-to-force-detect-enable.patch
ich-force-hpet-ich5-quirk-to-force-detect-enable-fix.patch
ich-force-hpet-ich5-fix-a-bug-with-suspend-resume.patch
ich-force-hpet-add-ich7_0-pciid-to-quirk-list.patch
hpet-force-enable-on-ich34.patch
hpet-force-enable-on-vt8235-37-chipsets.patch
time-simplify-smp_call_function_single-call-sequence.patch
kernel-rtmutex-debugc-cleanups.patch
kernel-time-timekeepingc-cleanups.patch
use-num_possible_cpus-instead-of-nr_cpus-for-timer.patch
kernel-time-clocksourcec-use-list_for_each_entry-instead-of-list_for_each.patch
whitespace-fixes-time-syscalls.patch
whitespace-fixes-interval-timers.patch
whitespace-fixes-system-timers.patch
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