[PATCH v2 02/12] selftests/mm: map_hugetlb: 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.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
---
 tools/testing/selftests/mm/map_hugetlb.c | 42 +++++++++++-------------
 1 file changed, 20 insertions(+), 22 deletions(-)

diff --git a/tools/testing/selftests/mm/map_hugetlb.c b/tools/testing/selftests/mm/map_hugetlb.c
index 86e8f2048a409..a1f005a90a4f0 100644
--- a/tools/testing/selftests/mm/map_hugetlb.c
+++ b/tools/testing/selftests/mm/map_hugetlb.c
@@ -16,6 +16,7 @@
 #include <sys/mman.h>
 #include <fcntl.h>
 #include "vm_util.h"
+#include "../kselftest.h"
 
 #define LENGTH (256UL*1024*1024)
 #define PROTECTION (PROT_READ | PROT_WRITE)
@@ -31,7 +32,7 @@
 
 static void check_bytes(char *addr)
 {
-	printf("First hex is %x\n", *((unsigned int *)addr));
+	ksft_print_msg("First hex is %x\n", *((unsigned int *)addr));
 }
 
 static void write_bytes(char *addr, size_t length)
@@ -42,23 +43,21 @@ static void write_bytes(char *addr, size_t length)
 		*(addr + i) = (char)i;
 }
 
-static int read_bytes(char *addr, size_t length)
+static void read_bytes(char *addr, size_t length)
 {
 	unsigned long i;
 
 	check_bytes(addr);
 	for (i = 0; i < length; i++)
-		if (*(addr + i) != (char)i) {
-			printf("Mismatch at %lu\n", i);
-			return 1;
-		}
-	return 0;
+		if (*(addr + i) != (char)i)
+			ksft_exit_fail_msg("Mismatch at %lu\n", i);
+
+	ksft_test_result_pass("Read correct data\n");
 }
 
 int main(int argc, char **argv)
 {
 	void *addr;
-	int ret;
 	size_t hugepage_size;
 	size_t length = LENGTH;
 	int flags = FLAGS;
@@ -69,6 +68,9 @@ int main(int argc, char **argv)
 	if (hugepage_size > length)
 		length = hugepage_size;
 
+	ksft_print_header();
+	ksft_set_plan(1);
+
 	if (argc > 1)
 		length = atol(argv[1]) << 20;
 	if (argc > 2) {
@@ -78,27 +80,23 @@ int main(int argc, char **argv)
 	}
 
 	if (shift)
-		printf("%u kB hugepages\n", 1 << (shift - 10));
+		ksft_print_msg("%u kB hugepages\n", 1 << (shift - 10));
 	else
-		printf("Default size hugepages\n");
-	printf("Mapping %lu Mbytes\n", (unsigned long)length >> 20);
+		ksft_print_msg("Default size hugepages\n");
+	ksft_print_msg("Mapping %lu Mbytes\n", (unsigned long)length >> 20);
 
 	addr = mmap(ADDR, length, PROTECTION, flags, -1, 0);
-	if (addr == MAP_FAILED) {
-		perror("mmap");
-		exit(1);
-	}
+	if (addr == MAP_FAILED)
+		ksft_exit_fail_msg("mmap: %s\n", strerror(errno));
 
-	printf("Returned address is %p\n", addr);
+	ksft_print_msg("Returned address is %p\n", addr);
 	check_bytes(addr);
 	write_bytes(addr, length);
-	ret = read_bytes(addr, length);
+	read_bytes(addr, length);
 
 	/* munmap() length of MAP_HUGETLB memory must be hugepage aligned */
-	if (munmap(addr, length)) {
-		perror("munmap");
-		exit(1);
-	}
+	if (munmap(addr, length))
+		ksft_exit_fail_msg("munmap: %s\n", strerror(errno));
 
-	return ret;
+	ksft_finished();
 }
-- 
2.42.0