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| author | Ingo Molnar <mingo@elte.hu> | 2009-07-03 08:30:27 -0500 |
|---|---|---|
| committer | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2016-02-13 00:34:57 +0100 |
| commit | 019b4bd2908ee8e228b72c7d9d9f0dca9764b177 (patch) | |
| tree | 24ae62e7f3baa59cec94709feb04cae4a58434b2 | |
| parent | 15eb6958cd80815f1113489e3ccdc50d35368015 (diff) | |
| download | rt-linux-019b4bd2908ee8e228b72c7d9d9f0dca9764b177.tar.gz | |
stop_machine: convert stop_machine_run() to PREEMPT_RT
Instead of playing with non-preemption, introduce explicit
startup serialization. This is more robust and cleaner as
well.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bigeasy: XXX: stopper_lock -> stop_cpus_lock]
| -rw-r--r-- | kernel/stop_machine.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c index a3bbaee77c586e..4ef69a3cc8110d 100644 --- a/kernel/stop_machine.c +++ b/kernel/stop_machine.c @@ -450,6 +450,16 @@ repeat: struct cpu_stop_done *done = work->done; char ksym_buf[KSYM_NAME_LEN] __maybe_unused; + /* + * Wait until the stopper finished scheduling on all + * cpus + */ + lg_global_lock(&stop_cpus_lock); + /* + * Let other cpu threads continue as well + */ + lg_global_unlock(&stop_cpus_lock); + /* cpu stop callbacks are not allowed to sleep */ preempt_disable(); |