From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Vasut <marex@denx.de>
Date: Fri, 20 Jul 2012 13:31:47 +0200
Subject: [U-Boot] [PATCH 1/2] common.h: Introduce
	DEFINE_CACHE_ALIGN_BUFFER
In-Reply-To: <201207200001.19869.vapier@gentoo.org>
References: <1341716895-31089-1-git-send-email-marex@denx.de>
	<201207200001.19869.vapier@gentoo.org>
Message-ID: <201207201331.48086.marex@denx.de>
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Dear Mike Frysinger,

> On Saturday 07 July 2012 23:08:14 Marek Vasut wrote:
> > +/*
> > + * DEFINE_CACHE_ALIGN_BUFFER() is similar to ALLOC_CACHE_ALIGN_BUFFER,
> > but it's + * purpose is to allow allocating aligned buffers outside of
> > function scope. + * Usage of this macro shall be avoided or used with
> > extreme care! + */
> > +#define DEFINE_CACHE_ALIGN_BUFFER(type, name, size)			
\
> > +	static char __##name[roundup(size * sizeof(type), ARCH_DMA_MINALIGN)] \
> > +			__aligned(ARCH_DMA_MINALIGN);			\
> > +									\
> > +	static type *name = (type *)__##name;
> 
> how is this any different from doing:
> 	static __u8 foo[1234] __aligned(ARCH_DMA_MINALIGN);
> -mike

Does __aligned() align both start of the buffer downwards and end of it upwards 
?

Best regards,
Marek Vasut