diff options
| author | Andi Kleen <andi@firstfloor.org> | 2010-02-02 14:40:02 -0800 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2010-02-05 23:21:18 +0100 |
| commit | d0679c730395d0bde9a46939e7ba255b4ba7dd7c (patch) | |
| tree | d6b6514d90826a2a52c463a944a301e267aeb30f | |
| parent | 59dde3853e07aaadc2b63abd16c954d5b0606cf1 (diff) | |
| download | linux-d0679c730395d0bde9a46939e7ba255b4ba7dd7c.tar.bz2 | |
kbuild: move -fno-dwarf2-cfi-asm to powerpc only
Better dwarf2 unwind information is a good thing, it allows better
debugging with kgdb and crash and helps systemtap.
Commit 003086497f07f7f1e67c0c295e261740f822b377 ("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 <ak@linux.intel.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>
| -rw-r--r-- | Makefile | 3 | ||||
| -rw-r--r-- | arch/powerpc/Makefile | 5 |
2 files changed, 5 insertions, 3 deletions
@@ -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) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 1a54a3b3a3fa..42dcd3f4ad7b 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -112,6 +112,11 @@ KBUILD_CFLAGS += $(call cc-option,-mspe=no) # kernel considerably. KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time) +# FIXME: the module load should be taught about the additional relocs +# generated by this. +# revert to pre-gcc-4.4 behaviour of .eh_frame +KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm) + # Never use string load/store instructions as they are # often slow when they are implemented at all KBUILD_CFLAGS += -mno-string |