Support for -fpatchable-function-entry on ppc64le was added in Clang with [1]. Faced a couple of issues while building the linux kernel with Clang though. Patches 1 & 2 address those issues. The last patch provides workaround to ensure, an open issue [2] in Clang with -fpatchable-function-entry support, does not impact the linux ftrace subsystem.
[1] https://github.com/llvm/llvm-project/pull/151569 [2] https://github.com/llvm/llvm-project/issues/163706 Hari Bathini (3): powerpc64: make clang cross-build friendly powerpc64/ftrace: fix OOL stub count with clang powerpc64/ftrace: workaround clang recording GEP in __patchable_function_entries arch/powerpc/Kconfig | 5 ++-- arch/powerpc/kernel/trace/ftrace.c | 26 ++++++++++++++++--- ....sh => check-fpatchable-function-entry.sh} | 0 arch/powerpc/tools/ftrace-gen-ool-stubs.sh | 4 +-- 4 files changed, 27 insertions(+), 8 deletions(-) rename arch/powerpc/tools/{gcc-check-fpatchable-function-entry.sh => check-fpatchable-function-entry.sh} (100%) -- 2.51.1
