linux-kernel - Re: [PATCH] MTD: Fix Orion NAND driver compilation with ARM OABI

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Message-id: <alpine.LFD.2.00.1003201132500.31128@xanadu.home>
Date:	Sat, 20 Mar 2010 11:37:24 -0400 (EDT)
From:	Nicolas Pitre <nico@...xnic.net>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Paulius Zaleckas <paulius.zaleckas@...il.com>, rth@...ddle.net,
	lkml <linux-kernel@...r.kernel.org>,
	linux-mtd@...ts.infradead.org, u.kleine-koenig@...gutronix.de,
	simon.kagstrom@...insight.net,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] MTD: Fix Orion NAND driver compilation with ARM OABI

On Sat, 20 Mar 2010, Mikael Pettersson wrote:

> I missed the start of this thread, but looking at orion_nand.c I fail to
> see why you'd need to mess with inline asm for reading a sequence of u64
> values from an I/O location to an array.

The reason for doing so with inline asm in the first place was not 
discussed in this thread.

> Rewriting that to proper C generates a nice ldrd;strd loop with my gcc-4.4.3.

Sure, GCC version 4.4.3 does the right thing.  Not all of them do.


Nicolas
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