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common: add a macro to align an array on the stack 

The macro can be used for temporary stack buffers which need to meet
a minimum alignment requirement.

This will be used by bcm2835 mailbox users, where all buffers need to
be aligned.

Signed-off-by: Andre Heider <a.heider@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Andre Heider 2013-10-19 14:20:48 +02:00 committed by Sascha Hauer
parent 0fdd91d92b
commit 55f6869c33
1 changed files with 11 additions and 0 deletions
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11
include/common.h
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@ -192,6 +192,17 @@ int run_shell(void);
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
#define ARRAY_AND_SIZE(x) (x), ARRAY_SIZE(x)
/*
* The STACK_ALIGN_ARRAY macro is used to allocate a buffer on the stack that
* meets a minimum alignment requirement.
*
* Note that the size parameter is the number of array elements to allocate,
* not the number of bytes.
*/
#define STACK_ALIGN_ARRAY(type, name, size, align) \
char __##name[sizeof(type) * (size) + (align) - 1]; \
type *name = (type *)ALIGN((uintptr_t)__##name, align)
/**
* container_of - cast a member of a structure out to the containing structure
* @ptr: the pointer to the member.