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Re: [dm-devel] [PATCH 2/3] Introduce percpu rw semaphores
- From: "Paul E. McKenney" <paulmck linux vnet ibm com>
- To: Mikulas Patocka <mpatocka redhat com>
- Cc: Jens Axboe <axboe kernel dk>, Andrea Arcangeli <aarcange redhat com>, Jan Kara <jack suse cz>, Eric Dumazet <eric dumazet gmail com>, linux-kernel vger kernel org, Jeff Moyer <jmoyer redhat com>, dm-devel redhat com, Alexander Viro <viro zeniv linux org uk>, kosaki motohiro jp fujitsu com, linux-fsdevel vger kernel org, lwoodman redhat com, "Alasdair G. Kergon" <agk redhat com>
- Subject: Re: [dm-devel] [PATCH 2/3] Introduce percpu rw semaphores
- Date: Mon, 30 Jul 2012 10:00:13 -0700
On Sun, Jul 29, 2012 at 01:13:34AM -0400, Mikulas Patocka wrote:
> On Sat, 28 Jul 2012, Eric Dumazet wrote:
> > On Sat, 2012-07-28 at 12:41 -0400, Mikulas Patocka wrote:
[ . . . ]
> > (bdev->bd_block_size should be read exactly once )
>
> Rewrite all direct and non-direct io code so that it reads block size just
> once ...
For whatever it is worth, the 3.5 Linux kernel only has about ten mentions
of bd_block_size, at least according to cscope.
Thanx, Paul
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