Patch "arm64: vdso: fix build error when switching from LE to BE" has been added to the 3.14-stable tree

Patch "arm64: vdso: fix build error when switching from LE to BE" has been added to the 3.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    arm64: vdso: fix build error when switching from LE to BE

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm64-vdso-fix-build-error-when-switching-from-le-to-be.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 1915e2ad1cf548217c963121e4076b3d44dd0169 Mon Sep 17 00:00:00 2001
From: Arun Chandran <achandran@mvista.com>
Date: Thu, 26 Jun 2014 15:16:03 +0530
Subject: arm64: vdso: fix build error when switching from LE to BE

From: Arun Chandran <achandran@mvista.com>

commit 1915e2ad1cf548217c963121e4076b3d44dd0169 upstream.

Building a kernel with CPU_BIG_ENDIAN fails if there are stale objects
from a !CPU_BIG_ENDIAN build. Due to a missing FORCE prerequisite on an
if_changed rule in the VDSO Makefile, we attempt to link a stale LE
object into the new BE kernel.

According to Documentation/kbuild/makefiles.txt, FORCE is required for
if_changed rules and forgetting it is a common mistake, so fix it by
'Forcing' the build of vdso. This patch fixes build errors like these:

arch/arm64/kernel/vdso/note.o: compiled for a little endian system and target is big endian
failed to merge target specific data of file arch/arm64/kernel/vdso/note.o

arch/arm64/kernel/vdso/sigreturn.o: compiled for a little endian system and target is big endian
failed to merge target specific data of file arch/arm64/kernel/vdso/sigreturn.o

Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Arun Chandran <achandran@mvista.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/arm64/kernel/vdso/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -43,7 +43,7 @@ $(obj)/vdso-offsets.h: $(obj)/vdso.so.db
 	$(call if_changed,vdsosym)
 
 # Assembly rules for the .S files
-$(obj-vdso): %.o: %.S
+$(obj-vdso): %.o: %.S FORCE
 	$(call if_changed_dep,vdsoas)
 
 # Actual build commands


Patches currently in stable-queue which might be from achandran@mvista.com are

queue-3.14/arm64-vdso-fix-build-error-when-switching-from-le-to-be.patch