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Date:	Thu, 6 Mar 2014 09:51:56 -0800
From:	"tip-bot for H. Peter Anvin" <>
Subject: [tip:x86/vdso] x86, vdso32: Disable stack protector,
  adjust optimizations

Commit-ID:  7ed5ee279499a02bf35c77f0a91d657c24f6474e
Author:     H. Peter Anvin <>
AuthorDate: Thu, 6 Mar 2014 09:47:20 -0800
Committer:  H. Peter Anvin <>
CommitDate: Thu, 6 Mar 2014 09:47:20 -0800

x86, vdso32: Disable stack protector, adjust optimizations

For the 32-bit VDSO, match the 64-bit VDSO in:

1. Disable the stack protector.
2. Use -fno-omit-frame-pointer for user space debugging sanity.
3. Use -foptimize-sibling-calls like the 64-bit VDSO does.

Reported-by: Ingo Molnar <>
Cc: Stefani Seibold <>
Cc: Andy Lutomirski <>
Signed-off-by: H. Peter Anvin <>
 arch/x86/vdso/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile
index 6cef7a1..55e76eb 100644
--- a/arch/x86/vdso/Makefile
+++ b/arch/x86/vdso/Makefile
@@ -151,6 +151,9 @@ KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
 KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
+KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector) 
+KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
+KBUILD_CFLAGS_32 += -fno-omit-frame-pointer
 $(vdso32-images:%=$(obj)/%.dbg): KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
 $(vdso32-images:%=$(obj)/%.dbg): $(obj)/ FORCE \
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