From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 10 Dec 2014 23:55:20 +0000 (-0800)
Subject: exit: reparent: call forget_original_parent() under tasklist_lock
X-Git-Tag: omap-for-v3.19/fixes-rc1~142^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=482a3767e5087f6e6ad2486a6655aaa5f3d59301;p=pandora-kernel.git

exit: reparent: call forget_original_parent() under tasklist_lock

Shift "release dead children" loop from forget_original_parent() to its
caller, exit_notify().  It is safe to reap them even if our parent reaps
us right after we drop tasklist_lock, those children no longer have any
connection to the exiting task.

And this allows us to avoid write_lock_irq(tasklist_lock) right after it
was released by forget_original_parent(), we can simply call it with
tasklist_lock held.

While at it, move the comment about forget_original_parent() up to
this function.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Sterling Alexander <stalexan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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