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

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Message-ID: <20160714094626.GN30927@twins.programming.kicks-ass.net>
Date:	Thu, 14 Jul 2016 11:46:26 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	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 Thu, Jul 14, 2016 at 11:37:33AM +0200, Peter Zijlstra wrote:
> static inline u8 *__qspinlock_lock_byte(struct qspinlock *lock)
> {
> 	return (u8 *)lock + 3 * IS_BUILTIN(__BIG_ENDIAN);
> }

Bugger, that doesn't actually work. IS_BUILTIN expects the symbol to be
defined to "1" and __BIG_ENDIAN is not (its "4321").