tree 922a0b9204b0cfcd5c59762f4d02e167d587ccd2
parent c2319540cd7330fa9066e5b9b84d357a2c8631a2
author Oleg Nesterov <oleg@tv-sign.ru> 1196295684 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1196357092 -0800

wait_task_stopped(): don't use task_pid_nr_ns() lockless

wait_task_stopped(WNOWAIT) does task_pid_nr_ns() without tasklist/rcu lock,
we can read an already freed memory.  Use the cached pid_t value.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Looks-good-to: Roland McGrath <roland@redhat.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>