Messages in this thread Patch in this message | | | Date | Mon, 11 Nov 2002 16:16:11 -0800 | From | Hanna Linder <> | Subject | [PATCH 2.4] Backport of container_of macro |
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This nifty little macro is used a lot in 2.5 but does not exist in 2.4 yet. Here is a patch to include it.
Hanna
kernel.h | 11 +++++++++++ 1 files changed, 11 insertions(+)
diff -Nru linux-2.4.20-rc1/include/linux/kernel.h linux-container_of/include/linux/kernel.h --- linux-2.4.20-rc1/include/linux/kernel.h Mon Nov 11 15:23:09 2002 +++ linux-container_of/include/linux/kernel.h Mon Nov 11 15:23:16 2002 @@ -174,6 +174,17 @@ extern void __out_of_line_bug(int line) ATTRIB_NORET; #define out_of_line_bug() __out_of_line_bug(__LINE__)
+/* + * 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) );}) + #endif /* __KERNEL__ */
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