From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Wed, 17 Oct 2007 06:27:22 +0000 (-0700)
Subject: exec: simplify ->sighand switching
X-Git-Tag: v2.6.24-rc1~675
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0840a90d943bcde2fbfeabd3c256236eed2273cd;p=pandora-kernel.git

exec: simplify ->sighand switching

There is no any reason to do recalc_sigpending() after changing ->sighand.
To begin with, recalc_sigpending() does not take ->sighand into account.

This means we don't need to take newsighand->siglock while changing sighands.
rcu_assign_pointer() provides a necessary barrier, and if another process
reads the new ->sighand it should either take tasklist_lock or it should use
lock_task_sighand() which has a corresponding smp_read_barrier_depends().

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>
---

Reading git-diff-tree failed