linux-kernel - Re: [PATCH] uvesafb: Fix warnings about unused variables on non-x86

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Date:	Fri, 9 Nov 2007 16:47:13 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frank Lichtenheld <frank@...htenheld.de>
Cc:	spock@...too.org, linux-kernel@...r.kernel.org,
	frank@...htenheld.de, linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: [PATCH] uvesafb: Fix warnings about unused variables on non-x86

On Fri,  9 Nov 2007 00:08:19 +0100
Frank Lichtenheld <frank@...htenheld.de> wrote:

> Variables that are only used in #ifdef CONFIG_X86 should also
> only be declared there.
> 
> Signed-off-by: Frank Lichtenheld <frank@...htenheld.de>
> ---
>  drivers/video/uvesafb.c |    6 ++++--
>  1 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c
> index b983d26..d1d6c0f 100644
> --- a/drivers/video/uvesafb.c
> +++ b/drivers/video/uvesafb.c
> @@ -926,8 +926,10 @@ static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
>  		int start, struct fb_info *info)
>  {
>  	struct uvesafb_ktask *task;
> +#ifdef CONFIG_X86
>  	struct uvesafb_par *par = info->par;
>  	int i = par->mode_idx;
> +#endif
>  	int err = 0;
>  
>  	/*
> @@ -1103,11 +1105,11 @@ static int uvesafb_pan_display(struct fb_var_screeninfo *var,
>  
>  static int uvesafb_blank(int blank, struct fb_info *info)
>  {
> -	struct uvesafb_par *par = info->par;
>  	struct uvesafb_ktask *task;
>  	int err = 1;
> -
>  #ifdef CONFIG_X86
> +	struct uvesafb_par *par = info->par;
> +
>  	if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
>  		int loop = 10000;
>  		u8 seq = 0, crtc17 = 0;

OK, but ug.  That's some quite nasty code you've found there.

it would come out better if that x86-specific code was pulled out into
separate functions like

#ifdef CONFIG_X86
static int do_x86_stuff(...)
{
	...
	return 1;
}
#else
static int do_x86_stuff(...)
{
	return 0;
}
#endif


static int uvesafb_setpalette(...)
{
	if (do_x86_stuff(...) == 0) {
		<do non-x86-specific-stuff>
	}
}

-
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