linux-kernel - Re: [PATCH] video: constify geode ops structures

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Date:	Tue, 10 Nov 2015 14:17:12 -0800
From:	Joe Perches <joe@...ches.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Christoph Hellwig <hch@...radead.org>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	kernel-janitors@...r.kernel.org,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-geode@...ts.infradead.org, linux-fbdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] video: constify geode ops structures

On Wed, 2015-11-11 at 01:02 +0300, Dan Carpenter wrote:
> On Tue, Nov 10, 2015 at 12:49:29PM -0800, Joe Perches wrote:
> > Is there a warning/info message produced by gcc and the
> > plug-in when a non-const declaration is converted to
> > const because of this attribute?
> 
> I'm not sure I understand the question.  What would the warning say?

Perhaps something like:

declaration of struct <foo> converted to const by __attribute__((do_const))

> We'll hopefully automatically make over 3000 structs const.  I
> understand warning that people should make structs const when possible
> but I don't understand why we would want to remove auto consting?

I'm not suggesting removing the attribute.
It seems sensible enough.

I just think the plug-in should at least optionally
note the instances when non-const declarations are
converted to const.

> Putting __do_const in the .h file is basically the same as marking
> every struct of that type as const in the .c file.

Not for a reader of the code that doesn't first
inspect the header files.

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