cpu/hotplug: Read_lock(tasklist_lock) doesn't need to disable irqs
cpu/hotplug: Read_lock(tasklist_lock) doesn't need to disable irqs

check_for_tasks() doesn't need to disable irqs, recursive
read_lock() from interrupt is fine.

While at it, s/do_each_thread/for_each_process_thread/.

Signed-off-by: Oleg Nesterov <20b70f0af00562e63758b9ee42012ecc96c58590@redhat.com>
Reviewed-by: Kirill Tkhai <e5b39230c99b4d3ebd6aa54f6d823f95134bc39d@odin.com>
Reviewed-by: Srikar Dronamraju <1f69195f6d934d4caf5816234bde319316df237e@linux.vnet.ibm.com>
Cc: Kirill Tkhai <e5b39230c99b4d3ebd6aa54f6d823f95134bc39d@parallels.com>
Cc: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>
Cc: Peter Zijlstra <3fddac958924aef220f202ca567388ddab3f14a8@infradead.org>
Cc: Thomas Gleixner <00e4cf8f46a57000a44449bf9dd8cbbcc209fd2a@linutronix.de>
Link: 76ff62f3a0a76877134354c54424d266f41c0019@redhat.com
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs