Message-ID: <5154AF3C.4080104@redhat.com>
Date: Thu, 28 Mar 2013 16:59:40 -0400
From: Rik van Riel <riel@redhat.com>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0
MIME-Version: 1.0
To: Michel Lespinasse <walken@google.com>
CC: Alex Shi <alex.shi@intel.com>, Ingo Molnar <mingo@kernel.org>,
        David Howells <dhowells@redhat.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Thomas Gleixner <tglx@linutronix.de>,
        Yuanhan Liu <yuanhan.liu@linux.intel.com>,
        Peter Hurley <peter@hurleysoftware.com>,
        Dave Chinner <david@fromorbit.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 07/13] rwsem: use cmpxchg for trying to steal write
 lock
References: <1363344869-15732-1-git-send-email-walken@google.com> <1363344869-15732-8-git-send-email-walken@google.com>
In-Reply-To: <1363344869-15732-8-git-send-email-walken@google.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 573
Lines: 14

On 03/15/2013 06:54 AM, Michel Lespinasse wrote:
> Using rwsem_atomic_update to try stealing the write lock forced us to
> undo the adjustment in the failure path. We can have simpler and faster
> code by using cmpxchg instead.
>
> Signed-off-by: Michel Lespinasse <walken@google.com>

Acked-by: Rik van Riel <riel@redhat.com>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/