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| author | Thomas Gleixner <tglx@linutronix.de> | 2008-09-29 15:44:46 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-09-29 17:09:14 +0200 |
| commit | b00c1a99e7758f794923c61e5cd55268d61c9469 (patch) | |
| tree | aace17598caf3dfaa01f8f2f4c6e587bb1f9a2f8 /include/linux/hrtimer.h | |
| parent | 41e1022eae71707f1ce6801a746f70b1e57b7567 (diff) | |
| download | lwn-b00c1a99e7758f794923c61e5cd55268d61c9469.tar.gz lwn-b00c1a99e7758f794923c61e5cd55268d61c9469.zip | |
hrtimer: mark migration state
Impact: during migration active hrtimers can be seen as inactive
The migration code removes the hrtimers from the queues of the dead
CPU and sets the state temporary to INACTIVE. The enqueue code sets it
to ACTIVE/PENDING again.
Prevent that the wrong state can be seen by using a separate migration
state bit.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/hrtimer.h')
| -rw-r--r-- | include/linux/hrtimer.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index 6d93dce61cbb..bdd88df1b4e5 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -67,9 +67,10 @@ enum hrtimer_cb_mode { * 0x02 callback function running * 0x04 callback pending (high resolution mode) * - * Special case: + * Special cases: * 0x03 callback function running and enqueued * (was requeued on another CPU) + * 0x09 timer was migrated on CPU hotunplug * The "callback function running and enqueued" status is only possible on * SMP. It happens for example when a posix timer expired and the callback * queued a signal. Between dropping the lock which protects the posix timer @@ -87,6 +88,7 @@ enum hrtimer_cb_mode { #define HRTIMER_STATE_ENQUEUED 0x01 #define HRTIMER_STATE_CALLBACK 0x02 #define HRTIMER_STATE_PENDING 0x04 +#define HRTIMER_STATE_MIGRATE 0x08 /** * struct hrtimer - the basic hrtimer structure |