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Compared to __member2struct(), this macro has the following advantages: - It ensures that the type of the pointer is compatible with the member field of the structure (or a void pointer). - It works properly in combination with volatile and const, though unfortunately it drops these qualifiers from the returned value. mdf@ proposed to add the container_of() macro, just like Linux has. Eventually I decided against this, as <sys/param.h> is included all over the place. It seems container_of() on Linux is specific to the kernel, not userspace. I'd rather not pollute userspace with this. I also thought about adding __container_of(), but this would have two advantages. Xorg seems to already have a __container_of(), which is not compatible with this version. Also, the underscore in the middle conflicts with our existing macros (__offsetof, __rangeof, etc). I'm changing member2struct() to use its old code, as the extra strictness of this new macro conflicts with existing code (read: cxgb). MFC after: 1 month
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