From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: userfaultfd: selftest: vm: allow to build in vm/ directory
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-aarcange@xxxxxxxxxx
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: "Dr. David Alan Gilbert" <dgilbert@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/vm/Makefile | 4 ++++
1 file changed, 4 insertions(+)
diff -puN tools/testing/selftests/vm/Makefile~userfaultfd-selftest-vm-allow-to-build-in-vm-directory tools/testing/selftests/vm/Makefile
--- a/tools/testing/selftests/vm/Makefile~userfaultfd-selftest-vm-allow-to-build-in-vm-directory
+++ a/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)
LDLIBS = -lrt
TEST_GEN_FILES = compaction_test
_
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