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SubjectRe: basic module bug
Also I don't know if I mentioned this is on the alpha architecture.
I've tried egcs 2.91.66, gcc-2.96-85 (redhat), binutils-
All kernel versions I've tried (2.4.4, 2.4.5, 2.4.7, 2.4.9, 2.2.19)
generate the same message. What am I doing wrong?

Where can I find a "skeleton" kernel module for comparison?

Bob McElrath [] wrote:
> Evgeny Polyakov [] wrote:
> > How do you compile this module?
> > I've just trying to do this with the following command and all is OK:
> > gcc ./test.c -c -o ./test.o -D__KERNEL__ -DMODULE.
> That's because if you -D__KERNEL__ the whole file is ifdef'ed out. ;)
> Remove the #ifdef __KERNEL__ stuff if you want to compile it that way.

Here's a simpler case more compatible with the options passed to gcc
when the kernel is compiled:

/* test module. Compile with: gcc -c -I/usr/src/linux/include
* -D__KERNEL__ -DMODULE test.c */
#include <linux/module.h>
#include <linux/kernel.h>
#include <asm/current.h>
#ifdef MODULE
int init_module(void)
int test_init(void)
return 0;
#ifdef MODULE
void cleanup_module(void)

(0)<mcelrath@draal:/home/mcelrath> gcc -c -I/usr/src/linux/include -D__KERNEL__ -DMODULE test.c
In file included from test.c:5:
/usr/src/linux/include/asm/current.h:4: warning: call-clobbered register used for global register variable

Yet a simpler case:

#include <asm/current.h>
int main() {}

Generates the same warning message. Why does this message not occur
when compiling the kernel?

-- Bob

Bob McElrath (
Univ. of Wisconsin at Madison, Department of Physics
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