simplify cpu_hotplug_begin()/put_online_cpus()

cpu_hotplug_begin() must be always called under cpu_add_remove_lock, this
means that only one process can be cpu_hotplug.active_writer.  So we don't
need the cpu_hotplug.writer_queue, we can wake up the ->active_writer
directly.

Also, fix the comment.

Signed-off-by: Oleg Nesterov <[email protected]>
Cc: Dipankar Sarma <[email protected]>
Acked-by: Gautham R Shenoy <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Srivatsa Vaddagiri <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions