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

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

From: Andrea Arcangeli <aarca...@redhat.com>


[ Upstream commit 46aa6a302b53f543f8e8b8e1714dc5e449ad36a6 ]

linux/tools/testing/selftests/vm $ make

  gcc -Wall -I ../../../../usr/include     compaction_test.c -lrt -o 
/compaction_test
  
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.4/../../../../x86_64-pc-linux-gnu/bin/ld: 
cannot open output file /compaction_test: Permission denied
  collect2: error: ld returned 1 exit status
  make: *** [../lib.mk:54: /compaction_test] Error 1

Since commit a8ba798bc8ec ("selftests: enable O and KBUILD_OUTPUT")
selftests/vm build fails if run from the "selftests/vm" directory, but
it works in the selftests/ directory.  It's quicker to be able to do a
local vm-only build after a tree wipe and this patch allows for it
again.

Link: http://lkml.kernel.org/r/20170302173738.18994-4-aarca...@redhat.com
Signed-off-by: Andrea Arcangeli <aarca...@redhat.com>
Cc: Mike Rapoport <r...@linux.vnet.ibm.com>
Cc: "Dr. David Alan Gilbert" <dgilb...@redhat.com>
Cc: Mike Kravetz <mike.krav...@oracle.com>
Cc: Pavel Emelyanov <xe...@parallels.com>
Cc: Hillf Danton <hillf...@alibaba-inc.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 tools/testing/selftests/vm/Makefile |    4 ++++
 1 file changed, 4 insertions(+)

--- a/tools/testing/selftests/vm/Makefile
+++ b/tools/testing/selftests/vm/Makefile
@@ -1,5 +1,9 @@
 # Makefile for vm selftests
 
+ifndef OUTPUT
+  OUTPUT := $(shell pwd)
+endif
+
 CFLAGS = -Wall -I ../../../../usr/include $(EXTRA_CFLAGS)
 BINARIES = compaction_test
 BINARIES += hugepage-mmap


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