From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Tina Ruchandani <ruchandani.tina@gmail.com>
Subject: Re: [PATCH -next] fbdev: radeon: Avoid 64 bit divide
Date: Mon, 08 Jun 2015 21:21:57 +0000 [thread overview]
Message-ID: <1433798517.4526.170.camel@kernel.crashing.org> (raw)
In-Reply-To: <5572053A.6060903@roeck-us.net>
On Fri, 2015-06-05 at 13:23 -0700, Guenter Roeck wrote:
> 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 ?
Don't bother.
> Guenter
>
> >> Fixes: ce8f4069dce8 ("fbdev: radeon: Remove 'struct timeval' usage")
> >> Cc: Tina Ruchandani <ruchandani.tina@gmail.com>
> >> Signed-off-by: Guenter Roeck <linux@roeck-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);
> >
> >
> >
prev parent reply other threads:[~2015-06-08 21:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-05 18:05 [PATCH -next] fbdev: radeon: Avoid 64 bit divide Guenter Roeck
2015-06-05 20:08 ` Benjamin Herrenschmidt
2015-06-05 20:23 ` Guenter Roeck
2015-06-08 21:21 ` Benjamin Herrenschmidt [this message]
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