linux-kernel - Re: [PATCH -next] fbdev: radeon: Avoid 64 bit divide

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Date:	Sat, 06 Jun 2015 06:08:37 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tina Ruchandani <ruchandani.tina@...il.com>
Subject: Re: [PATCH -next] fbdev: radeon: Avoid 64 bit divide

On Fri, 2015-06-05 at 11:05 -0700, Guenter Roeck wrote:
> A 64 bit divide causes build failures with 32 bit builds, such as
> 
> ERROR: "__divdi3" [drivers/video/fbdev/aty/radeonfb.ko] undefined!
> 
> or
> 
> drivers/built-in.o: In function `radeon_probe_pll_params':
> radeon_base.c:(.text+0x16608b): undefined reference to `__divdi3'

What about using do_div() instead ?

> Fixes: ce8f4069dce8 ("fbdev: radeon: Remove 'struct timeval' usage")
> Cc: Tina Ruchandani <ruchandani.tina@...il.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
>  drivers/video/fbdev/aty/radeon_base.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/video/fbdev/aty/radeon_base.c b/drivers/video/fbdev/aty/radeon_base.c
> index b3612e30d74f..374e47532035 100644
> --- a/drivers/video/fbdev/aty/radeon_base.c
> +++ b/drivers/video/fbdev/aty/radeon_base.c
> @@ -492,7 +492,7 @@ static int radeon_probe_pll_params(struct radeonfb_info *rinfo)
>  	/* Return -1 if more than 10 seconds have elapsed */
>  	if (delta > (10*1000000))
>  		return -1;
> -	hz = 1000000/delta;
> +	hz = 1000000 / (int)delta;
>  
>  	hTotal = ((INREG(CRTC_H_TOTAL_DISP) & 0x1ff) + 1) * 8;
>  	vTotal = ((INREG(CRTC_V_TOTAL_DISP) & 0x3ff) + 1);


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