linux-kernel - [PATCH v2] Makefile: kselftest and kselftest-clean fail for make O=dir case

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Date:   Wed, 20 Sep 2017 11:32:46 -0600
From:   Shuah Khan <shuahkh@....samsung.com>
To:     yamada.masahiro@...ionext.com, mmarek@...e.com, shuah@...nel.org,
        tglx@...utronix.de, mingo@...hat.com, peterz@...radead.org,
        bamvor.zhangjian@...aro.org, emilio.lopez@...labora.co.uk,
        corbet@....net
Cc:     Shuah Khan <shuahkh@....samsung.com>, tytso@....edu,
        ebiederm@...ssion.com, Tim.Bird@...y.com,
        gregkh@...uxfoundation.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v2] Makefile: kselftest and kselftest-clean fail for make O=dir case

kselftest and kselftest-clean targets fail when object directory is
specified to relocate objects. Fix it so it can find the source tree
to build from.

make O=/tmp/kselftest_top kselftest

make[1]: Entering directory '/tmp/kselftest_top'
make[2]: Entering directory '/tmp/kselftest_top'
make[2]: *** tools/testing/selftests: No such file or directory.  Stop.
make[2]: Leaving directory '/tmp/kselftest_top'
./linux-kselftest/Makefile:1185: recipe for target
'kselftest' failed
make[1]: *** [kselftest] Error 2
make[1]: Leaving directory '/tmp/kselftest_top'
Makefile:145: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2

Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
---
Changes v1 - V2: Simplify logic - use $(srctree)

 Makefile | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Makefile b/Makefile
index 64cbc66cebca..7735fc32b24e 100644
--- a/Makefile
+++ b/Makefile
@@ -1169,14 +1169,13 @@ headers_check: headers_install
 
 # ---------------------------------------------------------------------------
 # Kernel selftest
-
 PHONY += kselftest
 kselftest:
-	$(Q)$(MAKE) -C tools/testing/selftests run_tests
+	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
 
 PHONY += kselftest-clean
 kselftest-clean:
-	$(Q)$(MAKE) -C tools/testing/selftests clean
+	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
 
 PHONY += kselftest-merge
 kselftest-merge:
-- 
2.11.0