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kbuild: move -fno-dwarf2-cfi-asm to powerpc only

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Better dwarf2 unwind information is a good thing, it allows better
debugging with kgdb and crash and helps systemtap.

Commit 003086497f ("Build with
-fno-dwarf2-cfi-asm") disabled some CFI information globally to work
around a module loader bug on powerpc.

But this disables the better unwind tables for all architectures, not just
powerpc.  Move the workaround to powerpc and also add a suitable comment
that's it really a workaround.

This improves dwarf2 unwind tables on x86 at least.

Signed-off-by: Andi Kleen <[email protected]>
Cc: Kyle McMartin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Acked-by: Benjamin Herrenschmidt <[email protected]>
Signed-off-by: Michal Marek <[email protected]>
This commit is contained in:
Andi Kleen 2010-02-02 14:40:02 -08:00 • committed by Michal Marek
commit d0679c7303
2 changed files with 5 additions and 3 deletions
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Makefile
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@ -579,9 +579,6 @@ KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
# disable invalid "can't wrap" optimizations for signed / pointers
KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
# revert to pre-gcc-4.4 behaviour of .eh_frame
KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
# conserve stack if available
KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)