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

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Date:	Mon, 6 Feb 2012 11:18:54 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Anton Vorontsov <anton.vorontsov@...aro.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 10:59:09PM +0400, Anton Vorontsov wrote:
> 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.

Ah, you are right, my bad, sorry about that.

greg k-h
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