linux-kernel - Re: [PATCH 01/12] mutex: add atomic_dec_and_mutex

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Message-ID: <20090429115943.GD11586@elte.hu>
Date:	Wed, 29 Apr 2009 13:59:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, hch@...radead.org,
	alan@...rguk.ukuu.org.uk, sfr@...b.auug.org.au,
	john@...nmccutchan.com, rlove@...ve.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 01/12] mutex: add atomic_dec_and_mutex_lock


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Mon, 27 Apr 2009 17:53:05 -0400
> Eric Paris <eparis@...hat.com> wrote:
> 
> > Much like the atomic_dec_and_lock() function in which we take and hold a
> > spin_lock if we drop the atomic to 0 this function takes and holds the
> > mutex if we dec the atomic to 0.
> 
> I sucked these patches into -mm, mainly for a bit of compile-time 
> and runtime testing.

the locking API bit is already in the locking tree:

  9ab772c: mutex: add atomic_dec_and_mutex_lock()

I added it 23 days ago. Please dont add it to -mm a second time ;-)

	Ingo
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