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authorThomas Gleixner <tglx@linutronix.de>2007-09-22 22:29:06 +0000
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-09-22 17:15:34 -0700
commitb7e113dc9d52c4a37d2da6fafe77959f3a28eccf (patch)
tree51f7ff4350b684be360b9894b77f131933080145
parentb04e7bdb984e3b7f62fb7f44146a529f88cc7639 (diff)
downloadlinux-2.6.34-ux500-b7e113dc9d52c4a37d2da6fafe77959f3a28eccf.tar.gz
clockevents: remove the suspend/resume workaround^Wthinko
In a desparate attempt to fix the suspend/resume problem on Andrews VAIO I added a workaround which enforced the broadcast of the oneshot timer on resume. This was actually resolving the problem on the VAIO but was just a stupid workaround, which was not tackling the root cause: the assignement of lower idle C-States in the ACPI processor_idle code. The cpuidle patches, which utilize the dynamic tick feature and go faster into deeper C-states exposed the problem again. The correct solution is the previous patch, which prevents lower C-states across the suspend/resume. Remove the enforcement code, including the conditional broadcast timer arming, which helped to pamper over the real problem for quite a time. The oneshot broadcast flag for the cpu, which runs the resume code can never be set at the time when this code is executed. It only gets set, when the CPU is entering a lower idle C-State. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Andrew Morton <akpm@linux-foundation.org> Cc: Len Brown <lenb@kernel.org> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/time/tick-broadcast.c17
1 files changed, 1 insertions, 16 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index aab881c86a1..0962e057766 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -382,23 +382,8 @@ static int tick_broadcast_set_event(ktime_t expires, int force)
int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
{
- int cpu = smp_processor_id();
-
- /*
- * If the CPU is marked for broadcast, enforce oneshot
- * broadcast mode. The jinxed VAIO does not resume otherwise.
- * No idea why it ends up in a lower C State during resume
- * without notifying the clock events layer.
- */
- if (cpu_isset(cpu, tick_broadcast_mask))
- cpu_set(cpu, tick_broadcast_oneshot_mask);
-
clockevents_set_mode(bc, CLOCK_EVT_MODE_ONESHOT);
-
- if(!cpus_empty(tick_broadcast_oneshot_mask))
- tick_broadcast_set_event(ktime_get(), 1);
-
- return cpu_isset(cpu, tick_broadcast_oneshot_mask);
+ return 0;
}
/*