From: Oleg Nesterov <oleg@redhat.com>
Date: Wed, 27 Apr 2011 19:18:10 +0000 (+0200)
Subject: signal: cleanup sys_rt_sigprocmask()
X-Git-Tag: v3.0-rc1~382^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bb7efee2ca63b08795ffb3cda96fc89d2e641b79;p=pandora-kernel.git

signal: cleanup sys_rt_sigprocmask()

sys_rt_sigprocmask() looks unnecessarily complicated, simplify it.
We can just read current->blocked lockless unconditionally before
anything else and then copy-to-user it if needed.  At worst we
copy 4 words on mips.

We could copy-to-user the old mask first and simplify the code even
more, but the patch tries to keep the current behaviour: we change
current->block even if copy_to_user(oset) fails.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Matt Fleming <matt.fleming@linux.intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
---

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