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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-05-16 11:10:30 +0200
committerWolfgang Denk <wd@denx.de>2008-06-03 20:27:23 +0200
commit289011207d999b2e4085150d2aa30d547ad9b800 (patch)
tree0bd9e04764c76756b73176ff277f6c050333ba44 /include/common.h
parent110e006fe67fb4a6e1719ae6956c79b7ffc0148b (diff)
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Move definition of container_of() to common.h
AVR32 and AT91SAM9 both have their own identical definitions of container_of() taken from the Linux kernel. Move it to common.h so that all architectures can use it. container_of() is already used by some drivers, and will be used extensively by the new and improved SPI API. Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'include/common.h')
-rw-r--r--include/common.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h
index d0f5704..26e1b46 100644
--- a/include/common.h
+++ b/include/common.h
@@ -176,6 +176,17 @@ typedef void (interrupt_handler_t)(void *);
(__x > __y) ? __x : __y; })
+/**
+ * container_of - cast a member of a structure out to the containing structure
+ * @ptr: the pointer to the member.
+ * @type: the type of the container struct this is embedded in.
+ * @member: the name of the member within the struct.
+ *
+ */
+#define container_of(ptr, type, member) ({ \
+ const typeof( ((type *)0)->member ) *__mptr = (ptr); \
+ (type *)( (char *)__mptr - offsetof(type,member) );})
+
/*
* Function Prototypes
*/