selftests: avoid KBUILD_OUTPUT dir cluttering with selftest objects

Running "make kselftest" or building selftests when KBUILD_OUTPUT
is set, will create selftest objects in the KBUILD_OUTPUT directory.
This could be undesirable especially when user didn't intend to
relocate selftest objects.

Use KBUILD_OUTPUT/kselftest to create selftest objects instead of
cluttering the main directory.

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index c71a63b923d4..9781ca79794a 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -71,6 +71,9 @@ override LDFLAGS =
 override MAKEFLAGS =
 endif
 
+# Append kselftest to KBUILD_OUTPUT to avoid cluttering
+# KBUILD_OUTPUT with selftest objects and headers installed
+# by selftests Makefile or lib.mk.
 ifneq ($(KBUILD_SRC),)
 override LDFLAGS =
 endif
@@ -79,7 +82,7 @@ ifneq ($(O),)
         BUILD := $(O)
 else
         ifneq ($(KBUILD_OUTPUT),)
-                BUILD := $(KBUILD_OUTPUT)
+                BUILD := $(KBUILD_OUTPUT)/kselftest
         else
                 BUILD := $(shell pwd)
                 DEFAULT_INSTALL_HDR_PATH := 1