* 64-bit modulus operation in a 32-bit kernel
@ 2012-04-24 17:50 Alan Stern
2012-04-24 18:20 ` Takashi Iwai
2012-04-24 19:15 ` Andreas Schwab
0 siblings, 2 replies; 4+ messages in thread
From: Alan Stern @ 2012-04-24 17:50 UTC (permalink / raw)
To: Kernel development list
I need to compute the remainder when a 64-bit quantity is divided by a
small value (126 in this case). The % operator doesn't work in an
x86/32 kernel. What's the Right Way to do it?
Alan Stern
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 64-bit modulus operation in a 32-bit kernel
2012-04-24 17:50 64-bit modulus operation in a 32-bit kernel Alan Stern
@ 2012-04-24 18:20 ` Takashi Iwai
2012-04-24 18:57 ` Alan Stern
2012-04-24 19:15 ` Andreas Schwab
1 sibling, 1 reply; 4+ messages in thread
From: Takashi Iwai @ 2012-04-24 18:20 UTC (permalink / raw)
To: Alan Stern; +Cc: Kernel development list
At Tue, 24 Apr 2012 13:50:01 -0400 (EDT),
Alan Stern wrote:
>
> I need to compute the remainder when a 64-bit quantity is divided by a
> small value (126 in this case). The % operator doesn't work in an
> x86/32 kernel. What's the Right Way to do it?
div_u64_rem() in linux/math64.h?
Takashi
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 64-bit modulus operation in a 32-bit kernel
2012-04-24 18:20 ` Takashi Iwai
@ 2012-04-24 18:57 ` Alan Stern
0 siblings, 0 replies; 4+ messages in thread
From: Alan Stern @ 2012-04-24 18:57 UTC (permalink / raw)
To: Takashi Iwai; +Cc: Kernel development list
On Tue, 24 Apr 2012, Takashi Iwai wrote:
> At Tue, 24 Apr 2012 13:50:01 -0400 (EDT),
> Alan Stern wrote:
> >
> > I need to compute the remainder when a 64-bit quantity is divided by a
> > small value (126 in this case). The % operator doesn't work in an
> > x86/32 kernel. What's the Right Way to do it?
>
> div_u64_rem() in linux/math64.h?
Thanks for the pointer.
Alan Stern
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: 64-bit modulus operation in a 32-bit kernel
2012-04-24 17:50 64-bit modulus operation in a 32-bit kernel Alan Stern
2012-04-24 18:20 ` Takashi Iwai
@ 2012-04-24 19:15 ` Andreas Schwab
1 sibling, 0 replies; 4+ messages in thread
From: Andreas Schwab @ 2012-04-24 19:15 UTC (permalink / raw)
To: Alan Stern; +Cc: Kernel development list
Alan Stern <stern@rowland.harvard.edu> writes:
> I need to compute the remainder when a 64-bit quantity is divided by a
> small value (126 in this case). The % operator doesn't work in an
> x86/32 kernel. What's the Right Way to do it?
#include <asm/div64.h>
do_div(n,base) returns the remainder.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-04-24 19:15 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-04-24 17:50 64-bit modulus operation in a 32-bit kernel Alan Stern
2012-04-24 18:20 ` Takashi Iwai
2012-04-24 18:57 ` Alan Stern
2012-04-24 19:15 ` Andreas Schwab
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.