The patch titled
ACPI: keep track of timer broadcasting, fix
has been added to the -mm tree. Its filename is
acpi-keep-track-of-timer-broadcasting-fix.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: ACPI: keep track of timer broadcasting, fix
From: Ingo Molnar <mingo@xxxxxxx>
Many BIOSes offer C2 state but in reality they enter C3 - and hence the
local APIC stops working. So make acpi_timer_check_state() more
conservative and assume that the lapic-stops workaround is needed even in
C2.
This is a bug in the upstream ACPI code that, on the affected systems made
process statistics unreliable on SMP kernels. With the tick infrastructure
focusing all the splintered timer implementations this problem got
propagated to UP kernels too which either had the APIC enabled by the BIOS,
or used the 'lapic' boot option. Thus the existing regression got visible
on previously working configs too.
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
Cc: John Stultz <johnstul@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxx>
Cc: Roman Zippel <zippel@xxxxxxxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
drivers/acpi/processor_idle.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff -puN drivers/acpi/processor_idle.c~acpi-keep-track-of-timer-broadcasting-fix drivers/acpi/processor_idle.c
--- a/drivers/acpi/processor_idle.c~acpi-keep-track-of-timer-broadcasting-fix
+++ a/drivers/acpi/processor_idle.c
@@ -253,8 +253,10 @@ static void acpi_cstate_enter(struct acp
#ifdef ARCH_APICTIMER_STOPS_ON_C3
/*
- * Some BIOS implementations switch to C3 in the published C2 state. This seems
- * to be a common problem on AMD boxen.
+ * Some BIOS implementations switch to C3 in the published C2 state.
+ * This seems to be a common problem on AMD boxen, but other vendors
+ * are affected too. We pick the most conservative approach: we assume
+ * that the local APIC stops in both C2 and C3.
*/
static void acpi_timer_check_state(int state, struct acpi_processor *pr,
struct acpi_processor_cx *cx)
@@ -268,11 +270,8 @@ static void acpi_timer_check_state(int s
if (pwr->timer_broadcast_on_state < state)
return;
- if(cx->type == ACPI_STATE_C3 ||
- boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
+ if (cx->type >= ACPI_STATE_C2)
pr->power.timer_broadcast_on_state = state;
- return;
- }
}
static void acpi_propagate_timer_broadcast(struct acpi_processor *pr)
_
Patches currently in -mm which might be from mingo@xxxxxxx are
origin.patch
add-install_special_mapping.patch
i386-vdso-use-install_special_mapping.patch
x86_64-ia32-vdso-use-install_special_mapping.patch
powerpc-vdso-use-install_special_mapping.patch
use-correct-macros-in-raid-code-not-raw-asm.patch
use-correct-macros-in-raid-code-not-raw-asm-include.patch
acpi-i686-x86_64-fix-laptop-bootup-hang-in-init_acpi.patch
sata_sis-build-fix.patch
fix-for-crash-in-adummy_init.patch
bugfixes-pci-devices-get-assigned-redundant-irqs.patch
fix-x86_64-mm-convert-i386-pda-code-to-use-%fs.patch
x86_64-do-not-enable-the-nmi-watchdog-by-default.patch
spin_lock_irq-enable-interrupts-while-spinning-preparatory-patch.patch
spin_lock_irq-enable-interrupts-while-spinning-x86_64-implementation.patch
spin_lock_irq-enable-interrupts-while-spinning-i386-implementation.patch
spin_lock_irq-enable-interrupts-while-spinning-i386-implementation-fix.patch
spin_lock_irq-enable-interrupts-while-spinning-i386-implementation-fix-fix.patch
i386-kwatch-kernel-watchpoints-using-cpu-debug-registers.patch
i386-kwatch-kernel-watchpoints-using-cpu-debug-registers-fix.patch
cpuset-remove-sched-domain-hooks-from-cpusets.patch
lockdep-also-check-for-freed-locks-in-kmem_cache_free.patch
lockdep-more-unlock-on-error-fixes.patch
lockdep-more-unlock-on-error-fixes-fix.patch
lockdep-add-graph-depth-information-to-proc-lockdep.patch
consolidate-default-sched_clock.patch
use-cycle_t-instead-of-u64-in-struct-time_interpolator.patch
proc-remove-useless-and-buggy-nlink-settings.patch
simplify-the-stacktrace-code.patch
audit-fix-audit_filter_user_rules-initialization-bug.patch
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order-of-lockdep-off-on-in-vprintk-should-be-changed.patch
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gtod-persistent-clock-support.patch
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i386-remove-useless-code-in-tscc.patch
simplify-the-registration-of-clocksources.patch
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clocksource-replace-is_continuous-by-a-flag-field.patch
clocksource-replace-is_continuous-by-a-flag-field-fix.patch
clocksource-fixup-is_continous-changes-on-arm.patch
clocksource-fixup-is_continous-changes-on-avr32.patch
clocksource-fixup-is_continous-changes-on-s390.patch
clocksource-fixup-is_continous-changes-on-mips.patch
clocksource-remove-the-update-callback.patch
clocksource-add-verification-watchdog-helper.patch
clocksource-add-verification-watchdog-helper-fix.patch
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clocksource-add-verification-watchdog-helper-fix-3.patch
mark-tsc-on-geodelx-reliable.patch
uninline-irq_enter.patch
fix-cascade-lookup-of-next_timer_interrupt.patch
extend-next_timer_interrupt-to-use-a-reference-jiffie.patch
hrtimers-namespace-and-enum-cleanup.patch
hrtimers-namespace-and-enum-cleanup-vs-git-input.patch
hrtimers-cleanup-locking.patch
hrtimers-add-state-tracking.patch
hrtimers-clean-up-callback-tracking.patch
hrtimers-move-and-add-documentation.patch
acpi-fix-missing-include-for-up.patch
acpi-keep-track-of-timer-broadcasting.patch
acpi-keep-track-of-timer-broadcasting-fix.patch
allow-early-access-to-the-power-management-timer.patch
i386-apic-clean-up-the-apic-code.patch
clockevents-add-core-functionality.patch
tick-management-core-functionality.patch
tick-management-broadcast-functionality.patch
tick-management-dyntick--highres-functionality.patch
tick-management-dyntick--highres-functionality-fix.patch
clockevents-i383-drivers.patch
clockevents-i383-drivers-fix.patch
i386-rework-local-apic-timer-calibration.patch
i386-prepare-for-dyntick.patch
i386-prepare-nmi-watchdog-for-dynticks.patch
i386-enable-dynticks-in-kconfig.patch
hrtimers-add-high-resolution-timer-support.patch
hrtimers-prevent-possible-itimer-dos.patch
add-debugging-feature-proc-timer_stat.patch
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add-sysrq-q-to-print-timer_list-debug-info.patch
hrt-dynticks-hotplug-fix.patch
hrt-dynticks-hotplug-fix-fix.patch
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lockdep-show-held-locks-when-showing-a-stackdump-fix.patch
lockdep-show-held-locks-when-showing-a-stackdump-fix-2.patch
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