linux-kernel - Re: [PATCH 1/2 v2] kref: add kref_test_and

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Message-ID: <20110105155734.GC2072@kroah.com>
Date:	Wed, 5 Jan 2011 07:57:34 -0800
From:	Greg KH <greg@...ah.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	Jerome Marchand <jmarchan@...hat.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Jens Axboe <jaxboe@...ionio.com>,
	Satoru Takeuchi <takeuchi_satoru@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2 v2] kref: add kref_test_and_get

On Wed, Jan 05, 2011 at 05:43:22PM +0200, Alexey Dobriyan wrote:
> On Wed, Jan 5, 2011 at 5:02 PM, Jerome Marchand <jmarchan@...hat.com> wrote:
> > Add kref_test_and_get() function, which atomically add a reference only if
> > refcount is not zero. This prevent to add a reference to an object that is
> > already being removed.
> 
> Is kref supposed to be used only for "toy" structures where you aren't
> expected to do get possibly dead object?

Of course not, have you read the kref documentation?

{sigh}

Why do we even write these things if no one reads them...

greg k-h
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