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    Subject[PATCH 2.4] Backport of container_of macro

    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__ */

    #define SI_LOAD_SHIFT 16
    -
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