linux-kernel - Re: [PATCH v5 9/9] bug.h, compiler.h: Introduce compiletime_assert & BUILD_BUG_ON

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Date:	Thu, 15 Nov 2012 16:08:23 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Daniel Santos <daniel.santos@...ox.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christopher Li <sparse@...isli.org>,
	Daniel Santos <daniel.santos@...ox.com>,
	David Daney <david.daney@...ium.com>,
	David Howells <dhowells@...hat.com>,
	Joe Perches <joe@...ches.com>,
	Josh Triplett <josh@...htriplett.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	linux-sparse@...r.kernel.org,
	Michel Lespinasse <walken@...gle.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Pavel Pisa <pisa@....felk.cvut.cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v5 9/9] bug.h, compiler.h: Introduce compiletime_assert &
 BUILD_BUG_ON_MSG

On Tue, Nov 13, 2012 at 04:13:41PM -0600, danielfsantos@....net wrote:
> Introduce compiletime_assert to compiler.h, which moves the details of
> how to break a build and emit an error message for a specific compiler
> to the headers where these details should be. Following the tradition of
> the POSIX assert macro, compiletime_assert creates a build-time error
> when the supplied condition is *false*.
> 
> Next, we add BUILD_BUG_ON_MSG to bug.h which simply wraps
> compiletime_assert, inverting the logic, so that it fails when the
> condition is *true*, consistient with the language "build bug on." This
> macro allows you to specify the error message you want emitted when the
> supplied condition is true.
> 
> Finally, we remove all other code from bug.h that mucks with these
> details (BUILD_BUG & BUILD_BUG_ON), and have them all call
> BUILD_BUG_ON_MSG.  This not only reduces source code bloat, but also
> prevents the possibility of code being changed for one macro and not for
> the other (which was previously the case for BUILD_BUG and
> BUILD_BUG_ON).
> 
> Signed-off-by: Daniel Santos <daniel.santos@...ox.com>

Looks nice and clean.

Acked-by: Borislav Petkov <bp@...en8.de>

-- 
Regards/Gruss,
Boris.
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