11 Aug, 2011
5 commits
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There's a number of edge cases when cancelling a alarm, so
to be sure we accurately do so, introduce try_to_cancel, which
returns proper failure errors if it cannot. Also modify cancel
to spin until the alarm is properly disabled.CC: Thomas Gleixner
Signed-off-by: John Stultz -
In order to allow for functionality like try_to_cancel, add
more refined state tracking (similar to hrtimers).CC: Thomas Gleixner
Signed-off-by: John Stultz -
Now that periodic alarmtimers are managed by the handler function,
remove the period value from the alarm structure and let the handlers
manage the interval on their own.CC: Thomas Gleixner
Signed-off-by: John Stultz -
In order to avoid wasting time expiring and re-adding very high freq
periodic alarmtimers, introduce alarm_forward() which is similar to
hrtimer_forward and moves the timer to the next future expiration time
and returns the number of overruns.CC: Thomas Gleixner
Signed-off-by: John Stultz -
In order to properly fix the denial of service issue with high freq
periodic alarm timers, we need to push the re-arming logic into the
alarm timer handler, much as the hrtimer code does.This patch introduces alarmtimer_restart enum and changes the
alarmtimer handler declarations to use it as a return value. Further,
to ease following changes, it extends the alarmtimer handler functions
to also take the time at expiration. No logic is yet modified.CC: Thomas Gleixner
Signed-off-by: John Stultz
29 Apr, 2011
1 commit
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This patch addresses a number of minor comment improvements and
other minor issues from Thomas' review of the alarmtimers code.CC: Thomas Gleixner
Signed-off-by: John Stultz
27 Apr, 2011
1 commit
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This provides the in kernel interface and infrastructure for
alarm-timers.Alarm-timers are a hybrid style timer, similar to hrtimers,
but when the system is suspended, the RTC device is set to
fire and wake the system for when the soonest alarm-timer
expires.The concept for Alarm-timers was inspired by the Android Alarm
driver (by Arve Hjønnevåg) found in the Android kernel tree.See: http://android.git.kernel.org/?p=kernel/common.git;a=blob;f=drivers/rtc/alarm.c;h=1250edfbdf3302f5e4ea6194847c6ef4bb7beb1c;hb=android-2.6.36
This in-kernel interface should be fairly compatible with the
Android alarm driver in-kernel interface, but has the advantage
of utilizing the new RTC timerqueue code instead of doing direct
RTC manipulation.CC: Arve Hjønnevåg
CC: Thomas Gleixner
CC: Alessandro Zummo
Acked-by: Arnd Bergmann
Signed-off-by: John Stultz