On Tue, Oct 14, 2025 at 07:26:35PM -0400, Sasha Levin wrote: > This series adds support for Clang's Source-based Code Coverage to the > Linux kernel, enabling more accurate coverage measurement at the source > level compared to gcov. This is particularly valuable for safety-critical > use cases (automotive, medical, aerospace) where MC/DC coverage is required > for certification. > > Changes since previous patchset [1]: > - Rebased on v6.18-rc1 > - Adapted to lib/crypto reorganization (curve25519 exclusion moved to > lib/crypto/Makefile) > - Minor correctness fixes throughout the codebase > > The implementation has been tested with a kernel build using Clang 18+ and > boots successfully in a KVM environment with instrumentation enabled. > > [1] > https://lore.kernel.org/all/[email protected]/ > > Wentao Zhang (4): > llvm-cov: add Clang's Source-based Code Coverage support > llvm-cov: add Clang's MC/DC support > x86: disable llvm-cov instrumentation > x86: enable llvm-cov support > > Makefile | 9 ++ > arch/Kconfig | 1 + > arch/x86/Kconfig | 2 + > arch/x86/crypto/Makefile | 1 + > arch/x86/kernel/vmlinux.lds.S | 2 + > include/asm-generic/vmlinux.lds.h | 36 +++++ > kernel/Makefile | 1 + > kernel/llvm-cov/Kconfig | 121 ++++++++++++++ > kernel/llvm-cov/Makefile | 8 + > kernel/llvm-cov/fs.c | 253 ++++++++++++++++++++++++++++++ > kernel/llvm-cov/llvm-cov.h | 157 ++++++++++++++++++ > lib/crypto/Makefile | 3 +- > scripts/Makefile.lib | 23 +++ > scripts/mod/modpost.c | 2 +
I'm thinking I'm going to NAK this based on the fact that I'm not interested in playing file based games. As long as this thing doesn't honour noinstr I don't want this near x86. And we have kcov support, and gcov and now llvm-cov, surely 3 coverage solutions is like 2 too many?
