[PATCH 5.3 058/148] selftests: pidfd: Fix undefined reference to pthread_create()

[Greg Kroah-Hartman]

From: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>

commit 3969e76909d3aa06715997896184ee684f68d164 upstream.

Fix build failure:

undefined reference to `pthread_create'
collect2: error: ld returned 1 exit status

Fix CFLAGS to include pthread correctly.

Fixes: 740378dc7834 ("pidfd: add polling selftests")
Signed-off-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20190924195237.30519-1-skhan@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Christian Brauner <christian.brauner@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 tools/testing/selftests/pidfd/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/tools/testing/selftests/pidfd/Makefile
+++ b/tools/testing/selftests/pidfd/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
-CFLAGS += -g -I../../../../usr/include/ -lpthread
+CFLAGS += -g -I../../../../usr/include/ -pthread
 
 TEST_GEN_PROGS := pidfd_test pidfd_open_test