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

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

From: Josh Poimboeuf <jpoim...@redhat.com>

commit e17cf3a80d4ba0c4e40bf1a89deb1354c2e10e14 upstream.

Running "make O=foo" (with a relative directory path) fails with:

  scripts/Makefile.include:3: *** O=foo does not exist.  Stop.
  /home/jpoimboe/git/linux/Makefile:1547: recipe for target 'tools/objtool' 
failed

The tools Makefile gets confused by the relative path and tries to build
objtool in tools/foo.  Convert the output directory to an absolute path
before passing it to the tools Makefile.

Reported-by: Sudip Mukherjee <sudipm.mukher...@gmail.com>
Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Stephen Rothwell <s...@canb.auug.org.au>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: linux-n...@vger.kernel.org
Cc: li...@roeck-us.net
Cc: live-patch...@vger.kernel.org
Link: 
http://lkml.kernel.org/r/94a078c6c998fac9f01a14f574008bf7dff40191.1457016803.git.jpoim...@redhat.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 Makefile |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/Makefile
+++ b/Makefile
@@ -1506,11 +1506,11 @@ image_name:
 # Clear a bunch of variables before executing the submake
 tools/: FORCE
        $(Q)mkdir -p $(objtree)/tools
-       $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) 
subdir=tools -C $(src)/tools/
+       $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" 
O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
 
 tools/%: FORCE
        $(Q)mkdir -p $(objtree)/tools
-       $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(O) 
subdir=tools -C $(src)/tools/ $*
+       $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" 
O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
 
 # Single targets
 # ---------------------------------------------------------------------------


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