Pre 5.1-rc1 build issue

Commit https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d2c5c103b1337f590b7edf1509a6e294bdf22402
removed net/netfilter/nf_nat_core.h, which breaks wireguard builds for 5.1.0-0.rc0.git5.2.fc31.x86_64.

It sounds like it isn't needed any more from the commit message.
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There are also some rcu changes that I just guessed on fixes for. I think this change was covered in Paul McKenney's LCA talk in January.

I got something that seems to be working. So I'm good until the real fixes are ready.
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Perhaps your [fake?!] fixes could become the real fixes if you ran git send-email to the mailing list?

Jason
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I'll look at what I did to make sure I didn't make an unwanted rcu change. From Paul's talk it looks like there is a bit of a merger of a couple of rcu types to keep developers from getting confused and I think the unknown functions (that used to be known) should now call the non _bh version.

For the network include file I didn't include it any more. The correct fix is probably an ifdef based on kernel version or something like that.

So it might be useful to look at the changes I did, but I would be wary of committing them as is. It'll take me maybe an hour to double check and try it again on another system.
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