linux-kernel - Re: [PATCH v2 8/7] signal: cleanup sys_rt

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Message-ID: <20110425112633.GK17734@mtj.dyndns.org>
Date:	Mon, 25 Apr 2011 13:26:33 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikita V. Youshchenko" <nyoushchenko@...sta.com>,
	Matt Fleming <matt@...sole-pimps.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 8/7] signal: cleanup sys_rt_sigprocmask()

On Mon, Apr 18, 2011 at 03:47:00PM +0200, Oleg Nesterov wrote:
> 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@...hat.com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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