Commit-ID: 6447facba36e3fff77ab4c68f46297a5dab024c8 Gitweb: http://git.kernel.org/tip/6447facba36e3fff77ab4c68f46297a5dab024c8 Author: Andy Lutomirski <luto@xxxxxxx> AuthorDate: Mon, 23 May 2011 09:31:29 -0400 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Tue, 24 May 2011 14:51:29 +0200 x86-64: Turn off -pg and turn on -foptimize-sibling-calls for vDSO The vDSO isn't part of the kernel, so profiling and kernel backtraces don't really matter. Signed-off-by: Andy Lutomirski <luto@xxxxxxx> Cc: Andi Kleen <andi@xxxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx> Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Link: http://lkml.kernel.org/r/%3C23087b738c037342abb53f2f07b9bef89ceaeea3.1306156808.git.luto%40mit.edu%3E Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> --- arch/x86/vdso/Makefile | 15 ++++++++++++++- 1 files changed, 14 insertions(+), 1 deletions(-) diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile index a651861..bef0bc9 100644 --- a/arch/x86/vdso/Makefile +++ b/arch/x86/vdso/Makefile @@ -37,11 +37,24 @@ $(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg FORCE $(call if_changed,objcopy) +# +# Don't omit frame pointers for ease of userspace debugging, but do +# optimize sibling calls. +# CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ - $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) + $(filter -g%,$(KBUILD_CFLAGS)) $(call cc-option, -fno-stack-protector) \ + -fno-omit-frame-pointer -foptimize-sibling-calls $(vobjs): KBUILD_CFLAGS += $(CFL) +# +# vDSO code runs in userspace and -pg doesn't help with profiling anyway. +# +CFLAGS_REMOVE_vdso-note.o = -pg +CFLAGS_REMOVE_vclock_gettime.o = -pg +CFLAGS_REMOVE_vgetcpu.o = -pg +CFLAGS_REMOVE_vvar.o = -pg + targets += vdso-syms.lds obj-$(VDSO64-y) += vdso-syms.lds -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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