K 10
svn:author
V 2
ed
K 8
svn:date
V 27
2012-09-13T08:13:01.860621Z
K 7
svn:log
V 1072
Rename __member2struct() to __containerof().

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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