From 289011207d999b2e4085150d2aa30d547ad9b800 Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Fri, 16 May 2008 11:10:30 +0200 Subject: 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 --- include/common.h | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'include/common.h') diff --git a/include/common.h b/include/common.h index d0f57040e..26e1b469a 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 */ -- cgit v1.2.3