[patch 04/24] x86_64: Pass -32 to the assembler when compiling the 32bit vsyscall pages

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------

This quietens warnings and actually fixes a bug. The unwind tables would
come out wrong without -32, causing pthread cancellation during them 
to crash in the gcc runtime.

The problem seems to only happen with newer binutils
(it doesn't happen with 2.16.91.0.2 but happens wit 2.16.91.0.5) 

Thanks to Brian Baker @ HP for test case and initial analysis.

Cc: brian.b@xxxxxx

Signed-off-by: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>


---
 arch/x86_64/ia32/Makefile |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-2.6.16.11.orig/arch/x86_64/ia32/Makefile
+++ linux-2.6.16.11/arch/x86_64/ia32/Makefile
@@ -27,5 +27,5 @@ $(obj)/vsyscall-sysenter.so $(obj)/vsysc
 $(obj)/vsyscall-%.so: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE
 	$(call if_changed,syscall)
 
-AFLAGS_vsyscall-sysenter.o = -m32
-AFLAGS_vsyscall-syscall.o = -m32
+AFLAGS_vsyscall-sysenter.o = -m32 -Wa,-32
+AFLAGS_vsyscall-syscall.o = -m32 -Wa,-32

--
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