forked from mirrors/nixpkgs
64 lines
2.3 KiB
Diff
64 lines
2.3 KiB
Diff
http://www.mail-archive.com/armedslack@lists.armedslack.org/msg00212.html
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From d0679c730395d0bde9a46939e7ba255b4ba7dd7c Mon Sep 17 00:00:00 2001
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From: Andi Kleen <andi@firstfloor.org>
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Date: Tue, 2 Feb 2010 14:40:02 -0800
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Subject: [PATCH] kbuild: move -fno-dwarf2-cfi-asm to powerpc only
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Better dwarf2 unwind information is a good thing, it allows better
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debugging with kgdb and crash and helps systemtap.
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Commit 003086497f07f7f1e67c0c295e261740f822b377 ("Build with
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-fno-dwarf2-cfi-asm") disabled some CFI information globally to work
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around a module loader bug on powerpc.
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But this disables the better unwind tables for all architectures, not just
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powerpc. Move the workaround to powerpc and also add a suitable comment
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that's it really a workaround.
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This improves dwarf2 unwind tables on x86 at least.
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Signed-off-by: Andi Kleen <ak@linux.intel.com>
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Cc: Kyle McMartin <kyle@mcmartin.ca>
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Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Signed-off-by: Michal Marek <mmarek@suse.cz>
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---
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Makefile | 3 ---
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arch/powerpc/Makefile | 5 +++++
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2 files changed, 5 insertions(+), 3 deletions(-)
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diff --git a/Makefile b/Makefile
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index 03053c6..2e74a68 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -579,6 +579,9 @@ KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
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# disable invalid "can't wrap" optimizations for signed / pointers
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KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
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+# revert to pre-gcc-4.4 behaviour of .eh_frame
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+KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
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+
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# conserve stack if available
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KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
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diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
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index 1a54a3b..42dcd3f 100644
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--- a/arch/powerpc/Makefile
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+++ b/arch/powerpc/Makefile
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@@ -112,11 +112,6 @@ KBUILD_CFLAGS += $(call cc-option,-mspe=no)
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# kernel considerably.
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KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
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-# FIXME: the module load should be taught about the additional relocs
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-# generated by this.
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-# revert to pre-gcc-4.4 behaviour of .eh_frame
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-KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
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-
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# Never use string load/store instructions as they are
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# often slow when they are implemented at all
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KBUILD_CFLAGS += -mno-string
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--
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1.7.3.1
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