Dear stable kernel maintainers, (Woah, two in one day; have I exceeded my limit?)
Please consider the attached patch for 5.4 and 4.19 for commit b8a9092330da ("Kbuild: do not emit debug info for assembly with LLVM_IAS=1"), which fixes a significant number of warnings under arch/ when assembling a kernel with Clang.
These backports have already been shipped in Android; I would like to revert them and take them from syncing with stable. CrOS also has the patches staged, but I would prefer for them to sync them from stable as well.
b8a9092330da just landed in v5.10-rc7. I recently read https://lwn.net/Articles/838819/, which mentions a discussion about letting patches have more time to soak in mainline, so I accept if your decision is to wait, though I'll note these have been soaking in Android for 2 days shy of one month (Nov 10).
There were minor conflicts due to missing Kbuild support for compressed debug info, which is a feature I implemented but don't plan to backport to stable.
We plan to use Clang's integrated assembler for Android and CrOS for 4.19+.
See also: https://github.com/ClangBuiltLinux/linux/issues/716.