[Click] kernel mode - 2.6.24.7

[rchertov at cs.ucsb.edu]

On 11:24 am 03/15/10 Mythili <msmythili at gmail.com> wrote:
> But how is it that any other file with floating point arithmetic works
> fine and can be loaded as a kernel module? I am not sure if I get what
> you are saying.

Please take a look at this.
http://lkml.indiana.edu/hypermail/linux/kernel/0405.3/1620.html
Typically, FP operations are not a good idea in the kernel.

Roman

> 
> Mythili
> 
> 
> On 15 March 2010 11:23, adam.greenhalgh at googlemail.com <
> a.greenhalgh at cs.ucl.ac.uk> wrote:
> 
> > I didn't think the kernel supported floating point arithmetic. I
> > could be wrong , but its difficult to look things up from a commuter
> > train.
> >
> > Adam
> >
> > -original message-
> > Subject: [Click] kernel mode - 2.6.24.7
> > From: "Mythili" <msmythili at gmail.com>
> > Date: 15/03/2010 6:15 pm
> >
> > Hi
> >    I am running click on linux 2.6.24.7 (source from kernel.org). The
> > kernel has been patched successfully with the latest version of
> > click. I am able to run click in the kernel mode. I need to run some
> > floating point arithmetic in a new element. I see multiple errors
> > when I run make install. And of course insmod fails as there are
> > undefined symbols in the .ko files created by the make install
> > command.
> >
> > WARNING: "__mulsf3" [/home/live/Desktop/click-1.8.0/linuxmodule/click.ko]
> >  undefined!
> > WARNING: "__floatsisf"
> > [/home/live/Desktop/click-1.8.0/linuxmodule/click.ko]
> > undefined!
> > WARNING: "__subsf3" [/home/live/Desktop/click-1.8.0/linuxmodule/click.ko]
> >  undefined!
> > WARNING: "__divsf3" [/home/live/Desktop/click-1.8.0/linuxmodule/click.ko]
> >  undefined!
> >
> > I am able to run click in the usermode. I also tried using the same
> > arithmetic in a c file and loading it as a kernel module. There are no
> > errors.
> >
> > So my guess is that click needs to be configured with some specific
> > flags/options to fix this. I currently tried with no flags as
> > /usr/src/linux
> > points to the correct source directory. ( I am a little unsure about
> > how grid elements don't cause this error as floating point numbers
> > are used there). I would really appreciate any help on this.
> >
> > Regards
> > Mythili
> > _______________________________________________
> > click mailing list
> > click at amsterdam.lcs.mit.edu
> > https://amsterdam.lcs.mit.edu/mailman/listinfo/click
> >
> >
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