linux-kernel - Re: [PATCH] cgroups: fix probable race with put_css_set[_taskexit] and find_css

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Message-ID: <6599ad830809121233l6c58f879l6a483f368fc09aa5@mail.gmail.com>
Date:	Fri, 12 Sep 2008 12:33:37 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Greg KH" <greg@...ah.com>
Cc:	"Li Zefan" <lizf@...fujitsu.com>,
	"Lai Jiangshan" <laijs@...fujitsu.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cgroups: fix probable race with put_css_set[_taskexit] and find_css_set

On Fri, Sep 12, 2008 at 8:58 AM, Greg KH <greg@...ah.com> wrote:
>> If you're opposed to the addition of kref_put_and_write_lock() then
>> yes, I'll replace kref with a custom refcount.
>
> It just seems messy, but if you want to try it, I'll be glad to look at
> the code.  Oh wait, was that the patch that you sent out last time?

Yes - that patch replaced kref with a plain refcount. We weren't
really using kref as anything other than an atomic_dec_and_test()
wrapper anyway.

Paul
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