linux-kernel - Re: [RFC PATCH] freezer: revert 27920651fe "PM / Freezer: Make fake_signal_wake_up() wake TASK

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Message-ID: <20111101165535.GU18855@google.com>
Date:	Tue, 1 Nov 2011 09:55:35 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
Cc:	Jeff Layton <jlayton@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Steve French <sfrench@...ba.org>, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>, linux-pm@...r.kernel.org,
	linux-cifs@...r.kernel.org,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Neil Brown <neilb@...e.de>, linux-nfs@...r.kernel.org
Subject: Re: [RFC PATCH] freezer: revert 27920651fe "PM / Freezer: Make
 fake_signal_wake_up() wake TASK_KILLABLE tasks too"

Hello,

On Tue, Nov 01, 2011 at 12:49:31PM -0400, Trond Myklebust wrote:
> > #define wait_event_freezekillable(wq, condition)			\
> > do {									\
> > 	DEFINE_WAIT(__wait);						\
> > 	for (;;) {							\
> > 		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
> > 		if (condition || fatal_signal_pending(current))		\
> > 			break;						\
> > 		schedule();						\
> > 		try_to_freeze();					\
> > 	}								\
> > 	finish_wait(&wq, &__wait);					\
> > } while (0)
> 
> Err... Won't this end up busy-waiting if a non-fatal signal is received?

Ah... right, forgot about signal_pending_state() special case in
schedule().  Any better ideas, anyone?

-- 
tejun
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