The patch titled
kbuild: move -fno-dwarf2-cfi-asm to powerpc only
has been removed from the -mm tree. Its filename was
kbuild-move-fno-dwarf2-cfi-asm-to-powerpc-only.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: kbuild: move -fno-dwarf2-cfi-asm to powerpc only
From: Andi Kleen <andi@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Cc: Kyle McMartin <kyle@xxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Marek <mmarek@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Makefile | 3 ---
arch/powerpc/Makefile | 5 +++++
2 files changed, 5 insertions(+), 3 deletions(-)
diff -puN Makefile~kbuild-move-fno-dwarf2-cfi-asm-to-powerpc-only Makefile
--- a/Makefile~kbuild-move-fno-dwarf2-cfi-asm-to-powerpc-only
+++ a/Makefile
@@ -579,9 +579,6 @@ KBUILD_CFLAGS += $(call cc-option,-Wno-p
# 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 -puN arch/powerpc/Makefile~kbuild-move-fno-dwarf2-cfi-asm-to-powerpc-only arch/powerpc/Makefile
--- a/arch/powerpc/Makefile~kbuild-move-fno-dwarf2-cfi-asm-to-powerpc-only
+++ a/arch/powerpc/Makefile
@@ -112,6 +112,11 @@ KBUILD_CFLAGS += $(call cc-option,-mspe=
# 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
_
Patches currently in -mm which might be from andi@xxxxxxxxxxxxxx are
linux-next.patch
hardware-latency-detector-remove-default-m.patch
mm-add-swap-slot-free-callback-to-block_device_operations.patch
modpost-support-objects-with-more-than-64k-sections.patch
mm-introduce-dump_page-and-print-symbolic-flag-names.patch
readahead-introduce-fmode_random-for-posix_fadv_random.patch
lib-more-scalable-list_sort.patch
lib-more-scalable-list_sort-fix.patch
lib-revise-list_sort-header-comment.patch
lib-build-list_sort-only-if-needed.patch
coredump-unify-dump_seek-implementations-for-each-binfmt_c.patch
coredump-move-dump_write-and-dump_seek-into-a-header-file.patch
elf-coredump-replace-elf_core_extra_-macros-by-functions.patch
elf-coredump-make-offset-calculation-process-and-writing-process-explicit.patch
elf-coredump-add-extended-numbering-support.patch
tracehooks-kill-some-pt_ptraced-checks.patch
tracehooks-check-pt_ptraced-before-reporting-the-single-step.patch
ptrace_signal-check-pt_ptraced-before-reporting-a-signal.patch
export-__ptrace_detach-and-do_notify_parent_cldstop.patch
reorder-the-code-in-kernel-ptracec.patch
implement-utrace-ptrace.patch
utrace-core.patch
rcu-add-rcustring-adt-for-rcu-protected-strings.patch
add-a-kernel_address-that-works-for-data-too.patch
sysctl-add-proc_rcu_string-to-manage-sysctls-using-rcu-strings.patch
sysctl-use-rcu-strings-for-core_pattern-sysctl.patch
sysctl-add-call_usermodehelper_cleanup.patch
sysctl-convert-modprobe_path-to-proc_rcu_string.patch
sysctl-convert-poweroff_command-to-proc_rcu_string.patch
sysctl-convert-hotplug-helper-string-to-proc_rcu_string.patch
sysctl-use-rcu-protected-sysctl-for-ocfs-group-add-helper.patch
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