From: Nick Desaulniers ndesaulniers@google.com
This is _not_ an upstream commit and just for 4.19.y only. It is based on commit 32ef9e5054ec0321b9336058c58ec749e9c6b0fe upstream.
Alexey reported that the fraction of unknown filename instances in kallsyms grew from ~0.3% to ~10% recently; Bill and Greg tracked it down to assembler defined symbols, which regressed as a result of:
commit b8a9092330da ("Kbuild: do not emit debug info for assembly with LLVM_IAS=1")
In that commit, I allude to restoring debug info for assembler defined symbols in a follow up patch, but it seems I forgot to do so in
commit a66049e2cf0e ("Kbuild: make DWARF version a choice")
Fixes: b8a9092330da ("Kbuild: do not emit debug info for assembly with LLVM_IAS=1") Signed-off-by: Nick Desaulniers ndesaulniers@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Makefile | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/Makefile +++ b/Makefile @@ -744,7 +744,9 @@ KBUILD_CFLAGS += $(call cc-option, -gs else KBUILD_CFLAGS += -g endif -ifneq ($(LLVM_IAS),1) +ifeq ($(LLVM_IAS),1) +KBUILD_AFLAGS += -g +else KBUILD_AFLAGS += -Wa,-gdwarf-2 endif endif