Re: PATCH: type safe(r) list_entry repacement: generic_out_cast

Mikael Pettersson (mikpe@csd.uu.se)
Wed, 24 Jul 2002 02:51:58 +0200 (MET DST)

On Tue, 23 Jul 2002 18:58:52 -0400, Kevin O'Connor wrote:
>#define BackPtr(ptr, type, member) ({ \
> typeof( ((type *)0)->member ) *__mptr = (ptr); \
> ((type *)( (char *)__mptr - (unsigned long)(&((type *)0)->member) ));})

I've seen this sort of code several times now in the Linux kernel,
and I've never liked it. Is there some reason why you guys avoid
offsetof() like the plague?

/Mikael
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