[PATCH 03/12] selftests/mm: map_populate: conform test to TAP format output

[Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>]

Conform the layout, informational and status messages to TAP. No
functional change is intended other than the layout of output messages.
Minor cleanups have also been included.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
---
 tools/testing/selftests/mm/map_populate.c | 37 ++++++++++++++---------
 1 file changed, 23 insertions(+), 14 deletions(-)

diff --git a/tools/testing/selftests/mm/map_populate.c b/tools/testing/selftests/mm/map_populate.c
index 7945d07548751..5c8a53869b1bd 100644
--- a/tools/testing/selftests/mm/map_populate.c
+++ b/tools/testing/selftests/mm/map_populate.c
@@ -16,19 +16,21 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include "../kselftest.h"
 
 #define MMAP_SZ		4096
 
-#define BUG_ON(condition, description)					\
-	do {								\
-		if (condition) {					\
-			fprintf(stderr, "[FAIL]\t%s:%d\t%s:%s\n", __func__, \
-				__LINE__, (description), strerror(errno)); \
-			exit(1);					\
-		}							\
+#define BUG_ON(condition, description)						\
+	do {									\
+		if (condition)							\
+			ksft_exit_fail_msg("[FAIL]\t%s:%d\t%s:%s\n",		\
+					   __func__, __LINE__, (description),	\
+					   strerror(errno));			\
 	} while (0)
 
-static int parent_f(int sock, unsigned long *smap, int child)
+#define TESTS_IN_CHILD 2
+
+static void parent_f(int sock, unsigned long *smap, int child)
 {
 	int status, ret;
 
@@ -43,9 +45,10 @@ static int parent_f(int sock, unsigned long *smap, int child)
 	BUG_ON(ret <= 0, "write(sock)");
 
 	waitpid(child, &status, 0);
-	BUG_ON(!WIFEXITED(status), "child in unexpected state");
 
-	return WEXITSTATUS(status);
+	/* The ksft macros don't keep counters between processes */
+	ksft_cnt.ksft_pass = WEXITSTATUS(status);
+	ksft_cnt.ksft_fail = TESTS_IN_CHILD - WEXITSTATUS(status);
 }
 
 static int child_f(int sock, unsigned long *smap, int fd)
@@ -64,10 +67,11 @@ static int child_f(int sock, unsigned long *smap, int fd)
 	ret = read(sock, &buf, sizeof(int));
 	BUG_ON(ret <= 0, "read(sock)");
 
-	BUG_ON(*smap == 0x22222BAD, "MAP_POPULATE didn't COW private page");
-	BUG_ON(*smap != 0xdeadbabe, "mapping was corrupted");
+	ksft_test_result(*smap != 0x22222BAD, "MAP_POPULATE COW private page\n");
+	ksft_test_result(*smap == 0xdeadbabe, "The mapping state\n");
 
-	return 0;
+	/* The ksft macros don't keep counters between processes */
+	return ksft_cnt.ksft_pass;
 }
 
 int main(int argc, char **argv)
@@ -76,6 +80,9 @@ int main(int argc, char **argv)
 	FILE *ftmp;
 	unsigned long *smap;
 
+	ksft_print_header();
+	ksft_set_plan(TESTS_IN_CHILD);
+
 	ftmp = tmpfile();
 	BUG_ON(!ftmp, "tmpfile()");
 
@@ -101,7 +108,9 @@ int main(int argc, char **argv)
 		ret = close(sock[0]);
 		BUG_ON(ret, "close()");
 
-		return parent_f(sock[1], smap, child);
+		parent_f(sock[1], smap, child);
+
+		ksft_finished();
 	}
 
 	ret = close(sock[1]);
-- 
2.42.0