linux-kernel - Re: [PATCH 1/6] oom: Make find_lock_task

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Message-ID: <20120206185909.GB7741@oksana.dev.rtsoft.ru>
Date:	Mon, 6 Feb 2012 22:59:09 +0400
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	San Mehat <san@...gle.com>, Colin Cross <ccross@...roid.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, kernel-team@...roid.com,
	linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH 1/6] oom: Make find_lock_task_mm() sparse-aware

On Mon, Feb 06, 2012 at 08:35:42AM -0800, Greg KH wrote:
[...]
> > -extern struct task_struct *find_lock_task_mm(struct task_struct *p);
> > +extern struct task_struct *__find_lock_task_mm(struct task_struct *p);
> > +
> > +#define find_lock_task_mm(p)						\
> > +({									\
> > +	struct task_struct *__ret;					\
> > +									\
> > +	__cond_lock(&(p)->alloc_lock, __ret = __find_lock_task_mm(p));	\
> > +	__ret;								\
> > +})
> 
> Please use the proper "do...while" style thing here for multi-line,
> complex #defines like the rest of the kernel does so that you don't end
> up debugging horrible problems later.

Unfortunately this isn't possible in this case. Unlike '({})' GCC
extension, do-while statement does not evaluate to a value, i.e.
'x = do { 123; } while (0);' is illegal.

Thanks,

-- 
Anton Vorontsov
Email: cbouatmailru@...il.com
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