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authorOleg Nesterov <oleg@tv-sign.ru>2006-06-26 00:26:08 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:27 -0700
commit7b1c6154fa8bb937e0b1b4f2adbb315d70270f10 (patch)
tree1d58e5e7da61330639ebe62671fb666596d1b00a /README
parentd5f70c00ad24cd1158d3678b44ff969b4c971d49 (diff)
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[PATCH] coredump: don't take tasklist_lock
This patch removes tasklist_lock from zap_threads(). This is safe wrt: do_exit: The caller holds mm->mmap_sem. This means that task which shares the same ->mm can't pass exit_mm(), so it can't be unhashed from init_task.tasks or ->thread_group lists. fork: None of sub-threads can fork after zap_process(leader). All processes which were created before this point should be visible to zap_threads() because copy_process() adds the new process to the tail of init_task.tasks list, and ->siglock lock/unlock provides a memory barrier. de_thread: It does list_replace_rcu(&leader->tasks, &current->tasks). So zap_threads() will see either old or new leader, it does not matter. However, it can change p->sighand, so we should use lock_task_sighand() in zap_process(). Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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