[xfrm6_mode_transport]: untracked dependency

[Alexey Fomenko]

Hi, all.

Looks like module xfrm6_mode_transport should depend on ipv6 module.
While running kernel with ipv6 compiled as a module, and not loaded,
it's impossible to just "modprobe xfrm6_mode_transport", it complains
about wrong address family which is not supported. After manual
inserting ("modprobe ipv6"), subject module can be normally loaded. Same
case with compiled-in kernel IPv6 support: subject module can be
normally loaded.

So the question : what is the proper way to fix this? Normally depmod
should take care of discovering exported and used symbols but modinfo
shows that xfrm6_mode_transport doesn't have a dependency inside. I
didn't find normal way (i.e. like macros MODULE_DEPEND or so) to mark a
dependency manually in module sources.

Best regards
Alexey Fomenko

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