linux-kernel - Re: [PATCH] fbcon: fix sparse warning about shadowing 'p' symbol

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Date:	Wed, 12 Dec 2007 20:37:28 +0100
From:	Marcin Ślusarz <marcin.slusarz@...il.com>
To:	Dave Jones <davej@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, adaplas@...il.com
Subject: Re: [PATCH] fbcon: fix sparse warning about shadowing 'p' symbol

On Tue, Dec 11, 2007 at 09:50:32PM -0500, Dave Jones wrote:
> On Tue, Dec 11, 2007 at 04:57:00PM -0800, Andrew Morton wrote:
>
>  > > --- a/drivers/video/console/fbcon.c
>  > > +++ b/drivers/video/console/fbcon.c
>  > > @@ -2795,7 +2795,7 @@ static int fbcon_scrolldelta(struct vc_data *vc, int lines)
>  > >  {
>  > >  	struct fb_info *info = registered_fb[con2fb_map[fg_console]];
>  > >  	struct fbcon_ops *ops = info->fbcon_par;
>  > > -	struct display *p = &fb_display[fg_console];
>  > > +	struct display *disp = &fb_display[fg_console];
>  >
>  > We have a global symbol called "p"?  That would be bad.  Where is it?
>
> in the same function.
> We have quite a few shadow warnings in that file.
>
> drivers/video/console/fbcon.c:337:25: warning: symbol '_x' shadows an earlier one
> drivers/video/console/fbcon.c:337:25: originally declared here
> drivers/video/console/fbcon.c:337:25: warning: symbol '_x' shadows an earlier one
> drivers/video/console/fbcon.c:337:25: originally declared here
> drivers/video/console/fbcon.c:337:25: warning: symbol '_y' shadows an earlier one
> drivers/video/console/fbcon.c:337:25: originally declared here
That's from max(A, max(B, C)) and max is defined as:
#define max(x,y) ({ \
        typeof(x) _x = (x);     \
        typeof(y) _y = (y);     \
        (void) (&_x == &_y);            \
        _x > _y ? _x : _y; })

Don't know how to fix it without making the code look uglier...

> drivers/video/console/fbcon.c:3336:6: warning: symbol 'rotate' shadows an earlier one
> drivers/video/console/fbcon.c:150:12: originally declared here
> drivers/video/console/fbcon.c:3361:6: warning: symbol 'rotate' shadows an earlier one
> drivers/video/console/fbcon.c:150:12: originally declared here
> drivers/video/console/fbcon.c:3385:6: warning: symbol 'rotate' shadows an earlier one
> drivers/video/console/fbcon.c:150:12: originally declared here
That's fixed in another patch.

Marcin
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