linux-kernel - Re: [PATCH 1/1] bug: fix problem including <linux.bug.h> from linux/kernel.h

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Date:   Wed, 24 May 2017 15:37:59 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Ian Abbott <abbotti@....co.uk>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Nazarewicz <mina86@...a86.com>,
        Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
        Borislav Petkov <bp@...e.de>,
        Johannes Berg <johannes.berg@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH 1/1] bug: fix problem including <linux.bug.h> from linux/kernel.h

On 24 May 2017 at 15:21, Ian Abbott <abbotti@....co.uk> wrote:
> If "include/linux/kernel.h" includes <linux/bug.h>, a circular
> dependency is introduced

Then don't. Can't we just create linux/build_bug.h and have that
contain the BUILD_BUG related macros - they're really completely
unrelated to all the asm-cruft bug.h needs to know about. build_bug.h
can then include compiler.h and not much else to figure out how it may
implement its macros. Then kernel.h can include build_bug.h, and we
don't force each and every translation unit to include bug.h and
everything that then pulls in. We just got rid of a lot of header
bloat, let's try to keep it that way.

Rasmus