On Wed, 27 Feb 2008 08:22:07 +0200 Adrian Bunk <bunk@xxxxxxxxxx> wrote:
> On Tue, Feb 26, 2008 at 04:04:39PM -0800, Andrew Morton wrote:
> > On Tue, 26 Feb 2008 21:52:40 +0300 Evgeniy Polyakov <johnpol@xxxxxxxxxxx> wrote:
> >
> > > Hi Adrian.
> > >
> > > On Tue, Feb 26, 2008 at 05:34:21PM +0200, Adrian Bunk (bunk@xxxxxxxxxx) wrote:
> > > > Using ndelay() with a 64bit variable as parameter can result in build
> > > > errors like the following on some 32bit systems when it results in a
> > > > 64bit division:
> > > >
> > > > <-- snip -->
> > > >
> > > > ...
> > > > MODPOST 759 modules
> > > > ERROR: "__divdi3" [drivers/crypto/hifn_795x.ko] undefined!
> > > >
> > > > <-- snip -->
> > > >
> > > > Reported by Martin Michlmayr.
> > > >
> > > > Signed-off-by: Adrian Bunk <bunk@xxxxxxxxxx>
> > >
> > > Yep, ndelay() uses division, thanks a lot Adrian for spotting this.
> >
> > hm. Where?
> >...
>
> include/linux/delay.h:35
>
well found.
Something like this:
--- a/include/linux/delay.h~a
+++ a/include/linux/delay.h
@@ -7,10 +7,12 @@
* Delay routines, using a pre-computed "loops_per_jiffy" value.
*/
-extern unsigned long loops_per_jiffy;
+#include <linux/kernel.h>
#include <asm/delay.h>
+extern unsigned long loops_per_jiffy;
+
/*
* Using udelay() for intervals greater than a few milliseconds can
* risk overflow for high loops_per_jiffy (high bogomips) machines. The
@@ -32,7 +34,11 @@ extern unsigned long loops_per_jiffy;
#endif
#ifndef ndelay
-#define ndelay(x) udelay(((x)+999)/1000)
+static inline void ndelay(unsigned long x)
+{
+ udelay(DIV_ROUND_UP(x, 1000));
+}
+#define ndelay(x) ndelay(x)
#endif
void calibrate_delay(void);
_
-
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