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

[Guenter Roeck]

On 06/05/2015 01:08 PM, Benjamin Herrenschmidt wrote:
> 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 ?

delta is known to be <= 10*1000000, so I figured that would have been overkill.
But, sure, at the end it is the same. Want me to resubmit ?

Guenter

> > Fixes: ce8f4069dce8 ("fbdev: radeon: Remove 'struct timeval' usage")
> > Cc: Tina Ruchandani <ruchandani.tina@xxxxxxxxx>
> > Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> > ---
> >   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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