As per Michael Ellerman's comments, we don't need to specify the rule
in the Makefile, the implicit one will do the same. Also, the
"__EXPORTED_HEADERS__" include is not needed, because we build the
test against the installed kernel headers, not the kernel headers.
Include <unistd.h> rather than the rather specific
<asm-generic/unistd.h> (the former header is located in a standard
location and includes the latter).

My own cleanups: re-use "$(TEST_PROGS)" in the clean target rather than
spelling the executable twice. Include <syscall.h> rather than
<sys/syscall.h> (the former header is located in a standard location
and includes the latter).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
CC: Michael Ellerman <m...@ellerman.id.au>
CC: Andrew Morton <a...@linux-foundation.org>
CC: linux-...@vger.kernel.org
CC: Pranith Kumar <bobby.pr...@gmail.com>
CC: Shuah Khan <shua...@osg.samsung.com>
--
Changes since v1:
- Add Changelog.
---
 tools/testing/selftests/membarrier/Makefile          | 7 +++----
 tools/testing/selftests/membarrier/membarrier_test.c | 5 +----
 2 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/membarrier/Makefile 
b/tools/testing/selftests/membarrier/Makefile
index 877a503..a1a9708 100644
--- a/tools/testing/selftests/membarrier/Makefile
+++ b/tools/testing/selftests/membarrier/Makefile
@@ -1,11 +1,10 @@
 CFLAGS += -g -I../../../../usr/include/
 
-all:
-       $(CC) $(CFLAGS) membarrier_test.c -o membarrier_test
-
 TEST_PROGS := membarrier_test
 
+all: $(TEST_PROGS)
+
 include ../lib.mk
 
 clean:
-       $(RM) membarrier_test
+       $(RM) $(TEST_PROGS)
diff --git a/tools/testing/selftests/membarrier/membarrier_test.c 
b/tools/testing/selftests/membarrier/membarrier_test.c
index dde3125..535f0fe 100644
--- a/tools/testing/selftests/membarrier/membarrier_test.c
+++ b/tools/testing/selftests/membarrier/membarrier_test.c
@@ -1,9 +1,6 @@
 #define _GNU_SOURCE
-#define __EXPORTED_HEADERS__
-
 #include <linux/membarrier.h>
-#include <asm-generic/unistd.h>
-#include <sys/syscall.h>
+#include <syscall.h>
 #include <stdio.h>
 #include <errno.h>
 #include <string.h>
-- 
1.9.1

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