Merge ra7137b238a07 into the 12.0 branch

[tstellar]

Bugzilla Link	50631
Resolution	FIXED
Resolved on	Jun 10, 2021 16:09
Version	12.0
OS	All
Blocks	#48661
CC	@yonghong-song
Fixed by commit(s)	a7137b2 319a27b

Extended Description

Is it OK to merge the following revision(s) to the 12.0 branch?

[tstellar]

assigned to @4ast

[tstellar]

https://reviews.llvm.org/rLa7137b238a07

[tstellar]

Alexei,

What do you think about backporting this? It fixes some of the kernel bpf selftests with LLVM12 according to selftests/bpf/README.rst.

https://reviews.llvm.org/rGa7137b238a07

[4ast]

I don't see why backporting BTF for FLOAT shouldn't be done. The kernel has float vars, so it's more valid to emit them into BTF instead of faking them as INTs. libbpf supports FLOATs too. Just make sure to run libbpf that knows about it. There could be weird combinations of older libbpf and older kernel that don't know about FLOAT, but it's better to have a clear err on unrecognized FLOAT.

[tstellar]

Merged: 319a27b