linux-kernel - Re: [Xen-devel] [PATCH] xen/block: Correctly define structures in public headers on ARM32 and ARM64

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Message-ID: <20131203155547.669b8627@alan.etchedpixels.co.uk>
Date:	Tue, 3 Dec 2013 15:55:47 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Julien Grall <julien.grall@...aro.org>,
	Jan Beulich <JBeulich@...e.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Roger Pau Monne <roger.pau@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<patches@...aro.org>, <linux-arm-kernel@...ts.infradead.org>,
	<xen-devel@...ts.xenproject.org>,
	"Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] xen/block: Correctly define structures in
 public headers on ARM32 and ARM64

> Just a random thought but what about using the CONFIG_$ARCH to define a
> more semantic name, like HAVE_4_BYTE_ALIGNED_QUAD_WORDS, or whichever
> terminology for an 8-byte type is appropriate in the context.
> 
> Maybe Linux even already has such a #define?

It doesn't need one. It's written in GNU C so we have __alignof__.

See

http://gcc.gnu.org/onlinedocs/gcc/Alignment.html

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