linux-kernel - Re: [PATCH] sparse: Fix BUILD_BUG_ON

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Date:	Fri, 24 Jun 2011 23:48:44 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Randy Dunlap <rdunlap@...otime.net>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH] sparse: Fix BUILD_BUG_ON_{ZERO,NULL} definitions

On Fri, 2011-06-24 at 15:28 -0700, Randy Dunlap wrote:
> On Fri, 24 Jun 2011 22:45:12 +0100 Ben Hutchings wrote:
> 
> > Commit 903c0c7cdc21f2ccb7562a7bbc70289c0c2b16ad ('sparse: define dummy
> > BUILD_BUG_ON definition for sparse') left these two broken.  The ZERO
> > or NULL suffix specifies what the macro should expand to, not the
> > value that would indicate a bug.
> > 
> > Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> > ---
> > sparse currently reports a syntax error and no useful warnings for any
> > source file which uses one of these macros.  Since module_param() uses
> > BUILD_BUG_ON_ZERO(), that's a lot of source files.
> > 
> > Ben.
> 
> This patch from 2011-MAY-30 also fixes these warnings, but the typecasting
> in yours is probably better.  :)
>
> http://marc.info/?l=linux-kernel&m=130677145629121&w=2
> 
> Wait, 3.0-rc4 already has the above patch.  Is yours still needed?
[...]

Sorry, my baseline was a little out of date.

I'm not sure whether the type of BUILD_BUG_ON_ZERO() should be size_t;
that's just what the non-sparse definition works out as.  In some cases
it could make a difference whether it's signed or not.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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