linux-kernel - Re: [2.6.37-rc1] sys_ioprio

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Date:	Tue, 9 Nov 2010 13:50:44 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	Daniel J Blueman <daniel.blueman@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.37-rc1] sys_ioprio_set and RCU locking...

On Tue, Nov 09, 2010 at 09:35:10PM +0100, Jens Axboe wrote:
> On 2010-11-08 14:55, Jens Axboe wrote:
> >>>>> Take the RCU lock for read across acquiring the pointer to the task
> >>>>> credentials and dereferencing it.
> >>>>
> >>>> Jens, does this look sane?
> >>>
> >>> Yes, looks clean enough to me.
> >>
> >> Very good!  Are you willing to take the patch in your tree?
> > 
> > Certainly, I'm in the middle of patch monkeying now anyway. Will queue
> > it up.
> 
> The patch was buggy, I discovered that it does not do the proper
> RCU unlock if we fail the uid match. Merged version here:
> 
> http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=1a882abdbf9579ad0e5655f928e4ede30db301e6

Ouch!!!  I missed that one entirely, good catch!!!

							Thanx, Paul
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