The patch titled kbuild: move -fno-dwarf2-cfi-asm to powerpc only has been added to the -mm tree. Its filename is kbuild-move-fno-dwarf2-cfi-asm-to-powerpc-only.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this 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 @@ -577,9 +577,6 @@ 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 hardware-latency-detector-remove-default-m.patch kbuild-move-fno-dwarf2-cfi-asm-to-powerpc-only.patch mm-introduce-dump_page-and-print-symbolic-flag-names.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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html