extern variables in .c and .h files

[<threadhead@web.de>]

hi!

i've been been coding a LKM that should be
able to use variables, that are declared as extern.
i am using a 2.4.20 kernel.

the module is based on some code of
kernel/module.c.
(http://lxr.linux.no/source/kernel/module.c)

well, i tried different stuff with that LKM now.
take as an example:
i have the tulip module loaded. with my LKM i can make use of
extern const char * const medianame[];
(http://lxr.linux.no/source/drivers/net/tulip/tulip.h)
and display it, when using the same declaration in my LKM.

but for some strange reason i cannot use
variables that were declared a similar way in .c files in the
kernel source tree.
for example:
extern const struct exception_table_entry __start___ex_table[]; (kernel/module.c)

why can i access extern vars from header files and not
from source C files, that have been compiled as
part of my current kernel?

thank you for your time!

regards, threadhead
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