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core: add convenience macros to local.h

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Move ARRAY_SIZE() from tplg_local.h to local.h and add container_of()
macro to local.h. Both macros are generic but are initially used by
topology.

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Liam Girdwood 2015-08-11 18:23:15 +01:00 • committed by Takashi Iwai
parent 634712d21c
commit ab9633d581
2 changed files with 7 additions and 1 deletions
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7
include/local.h
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@ -350,4 +350,11 @@ int snd_config_search_alias_hooks(snd_config_t *config,
int _snd_conf_generic_id(const char *id);
/* convenience macros */
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
#endif