From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 30 Apr 2008 07:52:51 +0000 (-0700)
Subject: signals: do_tkill: don't use tasklist_lock
X-Git-Tag: v2.6.26-rc1~292
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3547ff3aefbe092ca35506c60c02e2d17a4f2199;p=pandora-kernel.git

signals: do_tkill: don't use tasklist_lock

Convert do_tkill() to use rcu_read_lock() + lock_task_sighand() to avoid
taking tasklist lock.

Note that we don't return an error if lock_task_sighand() fails, we pretend
the task dies after receiving the signal.  Otherwise, we should fight with the
nasty races with mt-exec without having any advantage.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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