While trying to compile a new driver for an 802.11 pci card, I started
work on upgrading the linux-wlan utilites to 2.4.0. Other than the
usual small things (like replacing references to kfree_s with kfree) the
work was going pretty smoothly.
I spent a good hour though, trying to debug one problem. The device
driver depends on having netlink in the kernel. When I attempted to
load the driver however, it would give me an unresolved symbol error
for netlink_broadcast, and netlink_kernel_create.
A quick fgrep of /proc/ksyms showed the error.. No version information
was included in the kernel symbol table.
e.g. When loading usb-storage.o, with an SMP compiled kernel + modversions :
insmod usb-storage
Using /lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved sd
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_deregister
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_free_dev
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_free_urb
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_inc_dev_use
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_alloc_urb
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_register
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_reset_device
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_string
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_submit_urb
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_control_msg
/lib/modules/2.4.1-SMP/kernel/drivers/usb/storage/usb-storage.o:
unresolved symbol usb_unlink_urb
A quick peek at /proc/ksyms shows :
fgrep usb_match_id /proc/ksyms
c02817f0 usb_match_id_R__ver_usb_match_id
~ ~ ~
The solution was to add the #include <linux/modversions.h> header
into each of the drivers affected. However, I have a feeling that
there are a lot of these "gotchas" still out there in 2.4.
Thoughts?
Martin.
[EMAIL PROTECTED]
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