Re: [U-Boot] [PATCH 1/2] common.h: Introduce DEFINE_CACHE_ALIGN_BUFFER

20 Jul 2012

      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