linux-kernel - Re: [PATCH 10/10] oom: Make find_lock_task

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Date:	Sat, 24 Mar 2012 17:43:27 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Russell King <linux@....linux.org.uk>,
	Mike Frysinger <vapier@...too.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Richard Weinberger <richard@....at>,
	Paul Mundt <lethal@...ux-sh.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	John Stultz <john.stultz@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linuxppc-dev@...ts.ozlabs.org, linux-sh@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net, linux-mm@...ck.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 10/10] oom: Make find_lock_task_mm() sparse-aware

On Sat, 2012-03-24 at 20:21 +0400, Anton Vorontsov wrote:

> Just wonder how do you see the feature implemented?
> 
> Something like this?
> 
> #define __ret_cond_locked(l, c)	__attribute__((ret_cond_locked(l, c)))
> #define __ret_value		__attribute__((ret_value))
> #define __ret_locked_nonnull(l)	__ret_cond_locked(l, __ret_value);
> 
> extern struct task_struct *find_lock_task_mm(struct task_struct *p)
> 	__ret_locked_nonnull(&__ret_value->alloc_lock);

Yeah, see the email I just CC'ed you on to linux-sparse.

Basically extend __attribute__((context())) to allow things similar to
what you proposed.
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