linux-kernel - Re: [PATCH V2] sparse: Allow override of sizeof(bool) warning

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Date:	Thu, 27 Feb 2014 12:55:28 -0800
From:	Christopher Li <sparse@...isli.org>
To:	Joe Perches <joe@...ches.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ben Pfaff <blp@...ira.com>,
	Josh Triplett <josh@...htriplett.org>,
	Linux-Sparse <linux-sparse@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] sparse: Allow override of sizeof(bool) warning

On Thu, Feb 27, 2014 at 12:39 PM, Joe Perches <joe@...ches.com> wrote:
> Please use V3 as I stuffed up the alphabetic order
> of sizeof and shadow.

Please send it your V3 then :-)

>
> I'm not sure it matters much, but the linux-kernel
> Makefile wouldn't need to be changed if Wsizeof_bool
> is default 0.

It seems default to off is the right thing to do.

>
> Here's a couple of other nits:
>
> Maybe the evaluate.c "size = bits_in_char;" assignment
>
>         if (size == 1 && is_bool_type(type)) {
> -               warning(expr->pos, "expression using sizeof bool");
> +               if (Wsizeof_bool)
> +                       warning(expr->pos, "expression using sizeof bool");
>                 size = bits_in_char;
>         }
>
> should be
>
>         size = sizeof(_Bool) * 8;

The reason to use bits_in_xxxx is to allow sparse application to over write
the size of int etc. If you don't like the bits_in_char here. You can introduce
bits_in_bool and set that to sizeof(Bool)*8 by default. That way you don't
hard code it.

> And also, in sparse.1, Josh Triplett is shown as
> the maintainer.  Maybe that should be changed to
> Christopher Li

Maybe a separate patch.

Waiting for your V3.

Chris
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