[PATCH v4 1/7] selftests/mm: hugepage-shm: conform test to TAP format output

[Muhammad Usama Anjum]

Conform the layout, informational and status messages to TAP. No
functional change is intended other than the layout of output messages.

The "." was being printed inside for loop to indicate the writes
progress. This was extraneous and hence removed in the patch.

Signed-off-by: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx>
---
Changes since v3:
- Rebased on top of next-20230125
---
 tools/testing/selftests/mm/hugepage-shm.c | 47 +++++++++++------------
 1 file changed, 22 insertions(+), 25 deletions(-)

diff --git a/tools/testing/selftests/mm/hugepage-shm.c b/tools/testing/selftests/mm/hugepage-shm.c
index 478bb1e989e9f..f949dbbc34540 100644
--- a/tools/testing/selftests/mm/hugepage-shm.c
+++ b/tools/testing/selftests/mm/hugepage-shm.c
@@ -34,11 +34,10 @@
 #include <sys/ipc.h>
 #include <sys/shm.h>
 #include <sys/mman.h>
+#include "../kselftest.h"
 
 #define LENGTH (256UL*1024*1024)
 
-#define dprintf(x)  printf(x)
-
 /* Only ia64 requires this */
 #ifdef __ia64__
 #define ADDR (void *)(0x8000000000000000UL)
@@ -54,44 +53,42 @@ int main(void)
 	unsigned long i;
 	char *shmaddr;
 
+	ksft_print_header();
+	ksft_set_plan(1);
+
 	shmid = shmget(2, LENGTH, SHM_HUGETLB | IPC_CREAT | SHM_R | SHM_W);
-	if (shmid < 0) {
-		perror("shmget");
-		exit(1);
-	}
-	printf("shmid: 0x%x\n", shmid);
+	if (shmid < 0)
+		ksft_exit_fail_msg("shmget: %s\n", strerror(errno));
+
+	ksft_print_msg("shmid: 0x%x\n", shmid);
 
 	shmaddr = shmat(shmid, ADDR, SHMAT_FLAGS);
 	if (shmaddr == (char *)-1) {
-		perror("Shared memory attach failure");
 		shmctl(shmid, IPC_RMID, NULL);
-		exit(2);
+		ksft_exit_fail_msg("Shared memory attach failure: %s\n", strerror(errno));
 	}
-	printf("shmaddr: %p\n", shmaddr);
 
-	dprintf("Starting the writes:\n");
-	for (i = 0; i < LENGTH; i++) {
+	ksft_print_msg("shmaddr: %p\n", shmaddr);
+
+	ksft_print_msg("Starting the writes:");
+	for (i = 0; i < LENGTH; i++)
 		shmaddr[i] = (char)(i);
-		if (!(i % (1024 * 1024)))
-			dprintf(".");
-	}
-	dprintf("\n");
+	ksft_print_msg("Done.\n");
 
-	dprintf("Starting the Check...");
+	ksft_print_msg("Starting the Check...");
 	for (i = 0; i < LENGTH; i++)
-		if (shmaddr[i] != (char)i) {
-			printf("\nIndex %lu mismatched\n", i);
-			exit(3);
-		}
-	dprintf("Done.\n");
+		if (shmaddr[i] != (char)i)
+			ksft_exit_fail_msg("\nIndex %lu mismatched\n", i);
+	ksft_print_msg("Done.\n");
 
 	if (shmdt((const void *)shmaddr) != 0) {
-		perror("Detach failure");
 		shmctl(shmid, IPC_RMID, NULL);
-		exit(4);
+		ksft_exit_fail_msg("Detach failure: %s\n", strerror(errno));
 	}
 
 	shmctl(shmid, IPC_RMID, NULL);
 
-	return 0;
+	ksft_test_result_pass("Completed test\n");
+
+	ksft_finished();
 }
-- 
2.42.0