linux-kernel - Re: [PATCH v3] locking/qrwlock: Let qrwlock has same layout regardless of the endian

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Message-ID: <20160713204057.GM30927@twins.programming.kicks-ass.net>
Date:	Wed, 13 Jul 2016 22:40:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	mingo@...hat.com, arnd@...db.de, Waiman.Long@....com
Subject: Re: [PATCH v3] locking/qrwlock: Let qrwlock has same layout
 regardless of the endian

On Wed, Jul 13, 2016 at 09:54:23PM +0200, Peter Zijlstra wrote:

> Urgh, I hate this stuff :/

> + * Writer states & reader shift and bias.
> + *
> + *       | +0 | +1 | +2 | +3 |
> + *   ----+----+----+----+----+
> + *    LE | 12 | 34 | 56 | 78 | 0x12345678
> + *   ----+----+----+----+----+
> + *    BE | 78 | 56 | 34 | 12 | 0x12345678
> + *   ----+----+----+----+----+

And of course I got that wrong.. its 0x78563412 in both cases.