* problem using integer division in kernel modules
@ 2003-01-15 18:41 Thomas Schlichter
2003-01-15 19:11 ` Matti Aarnio
0 siblings, 1 reply; 3+ messages in thread
From: Thomas Schlichter @ 2003-01-15 18:41 UTC (permalink / raw)
To: linux-kernel
Hi,
I am writing at a small kernel module and have a problem now using / and %. If
I do so I get following unresolved symbols when the module should be loaded:
__divdi3
__moddi3
Could you please help me and tell me what I do wrong..?
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: problem using integer division in kernel modules
2003-01-15 18:41 problem using integer division in kernel modules Thomas Schlichter
@ 2003-01-15 19:11 ` Matti Aarnio
2003-01-21 9:26 ` george anzinger
0 siblings, 1 reply; 3+ messages in thread
From: Matti Aarnio @ 2003-01-15 19:11 UTC (permalink / raw)
To: Thomas Schlichter; +Cc: linux-kernel
On Wed, Jan 15, 2003 at 07:41:29PM +0100, Thomas Schlichter wrote:
> Hi,
>
> I am writing at a small kernel module and have a problem now using / and %. If
> I do so I get following unresolved symbols when the module should be loaded:
> __divdi3
> __moddi3
64-bit division with non-constant non-power-of-two divider.
> Could you please help me and tell me what I do wrong..?
The kernel is linked without gcc builtin libraries.
Reasons can be found from FAQ (see footer), or archives.
/Matti Aarnio
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: problem using integer division in kernel modules
2003-01-15 19:11 ` Matti Aarnio
@ 2003-01-21 9:26 ` george anzinger
0 siblings, 0 replies; 3+ messages in thread
From: george anzinger @ 2003-01-21 9:26 UTC (permalink / raw)
To: Matti Aarnio; +Cc: Thomas Schlichter, linux-kernel
Matti Aarnio wrote:
>
> On Wed, Jan 15, 2003 at 07:41:29PM +0100, Thomas Schlichter wrote:
> > Hi,
> >
> > I am writing at a small kernel module and have a problem now using / and %. If
> > I do so I get following unresolved symbols when the module should be loaded:
> > __divdi3
> > __moddi3
>
> 64-bit division with non-constant non-power-of-two divider.
>
> > Could you please help me and tell me what I do wrong..?
>
> The kernel is linked without gcc builtin libraries.
> Reasons can be found from FAQ (see footer), or archives.
You may want to check out .../include/asm-???/div64.h. It
allows some limited divides with 64-bit numbers. Look at
several so you understand what it does and does not do.
-g
>
> /Matti Aarnio
> -
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--
George Anzinger george@mvista.com
High-res-timers:
http://sourceforge.net/projects/high-res-timers/
Preemption patch:
http://www.kernel.org/pub/linux/kernel/people/rml
^ permalink raw reply [flat|nested] 3+ messages in thread
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2003-01-15 19:11 ` Matti Aarnio
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