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-rw-r--r--include/common.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/common.h b/include/common.h
index d0f57040ee..26e1b469a1 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
*/