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From: H. Peter Anvin on 5 Aug 2010 16:40
Hi Linus,

The following changes since commit cdd854bc42b5e6c79bbbc40c6600d995ffe6e747:

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc (2010-08-05 09:03:46 -0700)

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-build-for-linus

H. Peter Anvin (2):
x86, vdso: Error out if the vdso contains external references
x86, vdso: Don't quote $nm in the script for checking vdso references

arch/x86/vdso/Makefile | 3 ++-
arch/x86/vdso/checkundef.sh | 10 ++++++++++
2 files changed, 12 insertions(+), 1 deletions(-)
create mode 100755 arch/x86/vdso/checkundef.sh

Merge made by recursive.
arch/x86/vdso/Makefile | 3 ++-
arch/x86/vdso/checkundef.sh | 10 ++++++++++
2 files changed, 12 insertions(+), 1 deletions(-)
create mode 100755 arch/x86/vdso/checkundef.sh
diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile
index 6b4ffed..4a2afa1 100644
--- a/arch/x86/vdso/Makefile
+++ b/arch/x86/vdso/Makefile
@@ -120,7 +120,8 @@ $(obj)/vdso32-syms.lds: $(vdso32.so-y:%=$(obj)/vdso32-%-syms.lds) FORCE
quiet_cmd_vdso = VDSO $@
cmd_vdso = $(CC) -nostdlib -o $@ \
$(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \
- -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^)
+ -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \
+ sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@'

VDSO_LDFLAGS = -fPIC -shared $(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
GCOV_PROFILE := n
diff --git a/arch/x86/vdso/checkundef.sh b/arch/x86/vdso/checkundef.sh
new file mode 100755
index 0000000..7ee90a9
--- /dev/null
+++ b/arch/x86/vdso/checkundef.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+nm="$1"
+file="$2"
+$nm "$file" | grep '^ *U' > /dev/null 2>&1
+if [ $? -eq 1 ]; then
+ exit 0
+else
+ echo "$file: undefined symbols found" >&2
+ exit 1
+fi
--
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