From: Mikael Pettersson <mikpe@csd.uu.se>
To: kevin@koconnor.net, neilb@cse.unsw.edu.au
Cc: linux-kernel@vger.kernel.org, torvalds@transmeta.com
Subject: Re: PATCH: type safe(r) list_entry repacement: generic_out_cast
Date: Wed, 24 Jul 2002 02:51:58 +0200 (MET DST) [thread overview]
Message-ID: <200207240051.CAA16434@harpo.it.uu.se> (raw)
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
next reply other threads:[~2002-07-24 0:48 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-24 0:51 Mikael Pettersson [this message]
2002-07-24 1:04 ` Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2002-07-23 11:28 Neil Brown
2002-07-23 11:47 ` Jakob Oestergaard
2002-07-23 12:42 ` Brian Gerst
2002-07-23 16:29 ` Linus Torvalds
2002-07-24 5:25 ` Thunder from the hill
2002-07-23 16:36 ` Christoph Hellwig
2002-07-23 22:58 ` Kevin O'Connor
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