From: Oleg Nesterov Date: Fri, 29 Sep 2006 09:01:09 +0000 (-0700) Subject: [PATCH] set EXIT_DEAD state in do_exit(), not in schedule() X-Git-Tag: v2.6.19-rc1~701 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=29b884921634e1e01cbd276e1c9b8fc07a7e4a90;p=pandora-kernel.git [PATCH] set EXIT_DEAD state in do_exit(), not in schedule() schedule() checks PF_DEAD on every context switch and sets ->state = EXIT_DEAD to ensure that the exiting task will be deactivated. Note that this EXIT_DEAD is in fact a "random" value, we can use any bit except normal TASK_XXX values. It is better to set this state in do_exit() along with PF_DEAD flag and remove that check in schedule(). We are safe wrt concurrent try_to_wake_up() (for example ptrace, tkill), it can not change task's ->state: the 'state' argument of try_to_wake_up() can't have EXIT_DEAD bit. And in case when try_to_wake_up() sees a stale value of ->state == TASK_RUNNING it will do nothing. Signed-off-by: Oleg Nesterov Cc: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Reading git-diff-tree failed