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Makefile.debug: re-enable debug info for .S files

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This is _not_ an upstream commit and just for 5.4.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>
This commit is contained in:
Nick Desaulniers 2022-10-24 13:34:14 -07:00 • committed by Greg Kroah-Hartman
commit 2f1b3377b6
1 changed files with 3 additions and 1 deletions
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4
Makefile
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@ -802,7 +802,9 @@ DEBUG_CFLAGS += -gsplit-dwarf
else
DEBUG_CFLAGS += -g
endif
ifneq ($(LLVM_IAS),1)
ifeq ($(LLVM_IAS),1)
KBUILD_AFLAGS += -g
else
KBUILD_AFLAGS += -Wa,-gdwarf-2
endif
endif