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SubjectRe: kernel load issues (insmod segfault)
Toralf Lund wrote:

> Hi.
>
> I thought I might try this one again (with updated code and more
> compete info):

Right. I think maybe I've made some kind of stupid mistake. Sorry.

I looked, and looked again, and just couldn't find anything wrong with
the module (so it must be the kernel, right?), but I looked the wrong
place, of course. It was the build flags, not the source code...

[ ... ]

>
>
> # make itifg8tst.o
> gcc -pipe -Wall -O2 -DLinux -mcpu=i686 -I../../include -fno-common
> -fno-strict-aliasing -fomit-frame-pointer -nostdinc -I.
> -I/lib/modules/2.6.11.4-0.EL.toralf/build/include
> -I/usr/lib/gcc/i386-redhat-linux/3.4.3/include -D__KERNEL__ -DMODULE
> -I/lib/modules/2.6.11.4-0.EL.toralf/build/include/asm-i386/mach-default
> -o itifg8tst.o -c itifg8tst.c

It seems like this is not quite right. I've now changed this build flags
based on the module build setup of the kernel sources, so that I have

gcc -DLinux -mpreferred-stack-boundary=2 -fno-unit-at-a-time
-march=i686 -mregparm=3 -I../../include -fno-strict-aliasing
-fno-common -ffreestanding -fomit-frame-pointer -nostdinc -I.
-I/lib/modules/2.6.11.4-0.EL.toralf/build/include -isystem
/usr/lib/gcc/i386-redhat-linux/3.4.3/include -D__KERNEL__ -DMODULE
-I/lib/modules/2.6.11.4-0.EL.toralf/build/include/asm-i386/mach-default
-o itifg8.mod.o -c itifg8.mod.c

and the module works!

I'm not sure what exactly did the trick, though. (Although I guess the
distinction between -march and just -mcpu might be significant.). If
someone would like to explain more about the different flags, just go
ahead....

- Toralf

-
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