From: Peter Zijlstra <peterz@infradead.org>
To: Ian Abbott <abbotti@mev.co.uk>
Cc: Michal Nazarewicz <mina86@mina86.com>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>,
Borislav Petkov <bp@suse.de>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Johannes Berg <johannes.berg@intel.com>,
Alexander Potapenko <glider@google.com>
Subject: Re: [PATCH v2] kernel.h: handle pointers to arrays better in container_of()
Date: Tue, 23 May 2017 13:24:15 +0200 [thread overview]
Message-ID: <20170523112415.nmbazvqmlhy343f2@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <139f0546-9b0a-d119-6b96-a9b35559be4b@mev.co.uk>
On Tue, May 23, 2017 at 11:32:02AM +0100, Ian Abbott wrote:
> > #define container_of(ptr, type, member) ( \
> > _Static_assert(__builtin_types_compatible_p( \
> > typeof(*ptr), typeof( ((type *)0)->member )), "WUT"), \
> > ((type *)((char *)(ptr) - offsetof(type, member))); \
> > )
>
> It's a fine suggestion (if more parentheses are added), but _Static_assert
> is a C11 feature, and I thought the kernel was using gnu89 (unless it's been
> updated since).
We have BUILD_BUG_ON() that should be similar in functionality.
next prev parent reply other threads:[~2017-05-23 11:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-22 15:03 Ian Abbott
2017-05-22 17:58 ` Michal Nazarewicz
2017-05-23 10:32 ` Ian Abbott
2017-05-23 11:24 ` Peter Zijlstra [this message]
2017-05-23 12:02 ` Ian Abbott
2017-05-23 13:23 ` Ian Abbott
2017-05-23 14:14 ` Ian Abbott
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