[Linux-ia64] kernel modules

[Linux-ia64] kernel modules

[Christian Groessler]

Hi,

I'm asking, whether loadable modules support is working and if not,
what's still missing.

I tried the current RH6.2 beta, and compiled the parport code
as module. (which compiled after I copied include/asm-i386/parport.h
to include/asm-ia64).

But it crashed at load time. The crash seems to be happening at
a function call itself, as a printk exactly before the call is
displayed and a printk right at the beginning of the called
function isn't. Seems like the module hasn't been linked
correctly.

I upgraded the kernel then to 2.4.0-test4, but no change.

Then I upgraded modutils to 2.3.12, and now when I do lsmod
it aborts with "get_kernel_syms: Function not implemented".

As far as I can tell, browsing thru the kernel code, there is
a handler for this function and also in the sys_call_table.
But I couldn't find the place where this error is generated.

Any insights would be greatly appreciated.

regards,
chris

RE: [Linux-ia64] kernel modules

[Stephens, Mike]

-----Original Message-----
> From: Christian Groessler [mailto:cpg@aladdin.de]
> Sent: Wednesday, July 19, 2000 6:45 AM
> To: linux-ia64@linuxia64.org
> Subject: [Linux-ia64] kernel modules
>
> Hi,
>
> I'm asking, whether loadable modules support is working and if not,
> what's still missing.
Yes modules can be made to work. However there are still a work in
progress, i.e. there are still bugs that need to be fix.

>
> I tried the current RH6.2 beta, and compiled the parport code
> as module. (which compiled after I copied include/asm-i386/parport.h
> to include/asm-ia64).
>
> But it crashed at load time. The crash seems to be happening at
> a function call itself, as a printk exactly before the call is
> displayed and a printk right at the beginning of the called
> function isn't. Seems like the module hasn't been linked
> correctly.
Unless you make changes to the Makefile they don't get linked correctly.
The current IA64 version modutils can't load a module if it (or the kernel)
was compiled with the -mconstant-gp flag, which is part of the CFLAGS define
in arch/ia64/Makefile.

Using a 2.4.0-test1 + 0609 patch (or newer kernel) and compile without the
constant-gp flag about 95% of the modules I have tried work. 

>
> I upgraded the kernel then to 2.4.0-test4, but no change.
>
> Then I upgraded modutils to 2.3.12, and now when I do lsmod
> it aborts with "get_kernel_syms: Function not implemented".
This is caused by a problems in the configure and makefile that
cause the modutils to get link wrong for IA64. The quick fix is
add USE_SYSCALL=n to the top of util/Makefile.

I hope to have a patch to fix this and a couple of other bugs
out some time this week.

>
> As far as I can tell, browsing thru the kernel code, there is
> a handler for this function and also in the sys_call_table.
> But I couldn't find the place where this error is generated.
>
> Any insights would be greatly appreciated.
>
> regards,
> chris


regards

Mike

_______________________
mike.stephens@intel.com

RE: [Linux-ia64] kernel modules

[Christian Groessler]

Hi,

On 07/19/2000 04:44:08 PM GMT "Stephens, Mike" wrote:
>
>> But it crashed at load time. The crash seems to be happening at
>> a function call itself, as a printk exactly before the call is
>> displayed and a printk right at the beginning of the called
>> function isn't. Seems like the module hasn't been linked
>> correctly.
>Unless you make changes to the Makefile they don't get linked correctly.
>The current IA64 version modutils can't load a module if it (or the
kernel)
>was compiled with the -mconstant-gp flag, which is part of the CFLAGS
define
>in arch/ia64/Makefile.
>
>Using a 2.4.0-test1 + 0609 patch (or newer kernel) and compile without the
>constant-gp flag about 95% of the modules I have tried work.

Thanks. When compiling w/o constant-gp the parport modules work, but...

>>
>> Then I upgraded modutils to 2.3.12, and now when I do lsmod
>> it aborts with "get_kernel_syms: Function not implemented".
>This is caused by a problems in the configure and makefile that
>cause the modutils to get link wrong for IA64. The quick fix is
>add USE_SYSCALL=n to the top of util/Makefile.

Regardless of USE_SYSCALL=n is there or not, I get the "Function
not implemeted" error with modutils-2.3.12.
I reverted to using the (precompiled) modutils which came on
the RedHat CD...

regards,
chris