CODEWITHSUNDEEP
linuxlinux-kernelkernel-module
luis tavares
luis tavares

Reputation: 51

How to make one Linux kernel module depend on another external module with depmod?

I'm writing a kernel module which depends on one existing kernel module. I'm building my module out of the tree (as an external module).

How can I declare the dependency, so that it is recognized by depmod?

Upvotes: 5

Views: 10017

Answers (2)

ctuffli
ctuffli

Reputation: 3580

While not entirely satisfying, the best I've come up with to make modprobe work is either adding an entry to modules.dep

# tail -1 modules.dep
../../../../home/ctuffli/mymod/mymod.ko: kernel/drivers/scsi/libsas/libsas.ko kernel/drivers/scsi/scsi_transport_sas.ko

or alternatively, symbolically linking the out-of-tree module to /lib/modules/ and let depmod figure out the dependencies

# ln -s /home/ctuffli/mymod/mymod.ko /lib/modules/2.6.31-19-server/kernel/drivers/scsi/
# depmod
# grep mymod /lib/modules/2.6.31-19-server/modules.dep
kernel/drivers/scsi/mymod.ko: kernel/drivers/scsi/libsas/libsas.ko kernel/drivers/scsi/scsi_transport_sas.ko

Upvotes: 4

stsquad
stsquad

Reputation: 6030

You don't need to. depmod will run through all modules in the current /lib/modules/ directory and build it's dependency tree based on unresolved symbols.

By default it will assume any symbol not provided by another module is in the kernel however you can use the -e/-F options to check that is the case too.

Upvotes: 0

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