linux-kernel - Re: [PATCH 6/6] freezer: kill unused set_freezable_with

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Message-ID: <20110906152539.GA16899@redhat.com>
Date:	Tue, 6 Sep 2011 17:25:39 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	matthltc@...ibm.com, rjw@...k.pl, paul@...lmenage.org,
	containers@...ts.linux-foundation.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] freezer: kill unused set_freezable_with_signal()

On 09/06, Oleg Nesterov wrote:
>
> Yes, agreed. In this case I think it should be
>
> 	#define wait_event_freezable(wq, condition)				\
> 	({									\
> 		int __retval;							\
> 		for (;;) {							\
> 			__retval = wait_event_interruptible(wq, 		\
> 					(condition) || freezing(current));	\
> 			if (__retval || (condition))				\
> 				break;						\
> 			try_to_freeze();					\
> 		}								\
> 		__retval;							\
> 	})
>
> __retval/ERESTARTSYS is only needed for kthreads which play with allow_signal(),
> probably nobody should do this.

I meant, unless the caller plays with allow_signal(), it has all rights to do

	if (wait_event_freezable(...))
		BUG();

This becomes correct with the code above.

Oleg.

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