diff options
| author | Sebastian Andrzej Siewior <[email protected]> | 2017-05-24 10:15:28 +0200 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2017-05-26 10:10:42 +0200 |
| commit | 210e21331fc3a396af640cec652be769d146e49f (patch) | |
| tree | 6a93eece8fdbd2c9bf77aeeab2a42e84cb7899ec /kernel | |
| parent | f9a69931c3959940538884d5962b770c3db75df5 (diff) | |
cpu/hotplug: Use stop_machine_cpuslocked() in takedown_cpu()
takedown_cpu() is a cpu hotplug function invoking stop_machine(). The cpu
hotplug machinery holds the hotplug lock for write.
stop_machine() invokes get_online_cpus() as well. This is correct, but
prevents the conversion of the hotplug locking to a percpu rwsem.
Use stop_machine_cpuslocked() to avoid the nested call.
Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Tested-by: Paul E. McKenney <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cpu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index e4389ac55b65..142d889d9f69 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -701,7 +701,7 @@ static int takedown_cpu(unsigned int cpu) /* * So now all preempt/rcu users must observe !cpu_active(). */ - err = stop_machine(take_cpu_down, NULL, cpumask_of(cpu)); + err = stop_machine_cpuslocked(take_cpu_down, NULL, cpumask_of(cpu)); if (err) { /* CPU refused to die */ irq_unlock_sparse(); |