selftests/mm: mremap_dontunmap: conform test to TAP format output

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

Link: https://lkml.kernel.org/r/20240202113119.2047740-8-usama.anjum@collabora.comSigned-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

tools/testing/selftests/mm/mremap_dontunmap.c

@@ -30,10 +30,10 @@ static void dump_maps(void)
 #define BUG_ON(condition, description)						\
 	do {									\
 		if (condition) {						\
-			fprintf(stderr, "[FAIL]\t%s():%d\t%s:%s\n", __func__, \
-				__LINE__, (description), strerror(errno));    \
 			dump_maps();						\
-			exit(1);					      \
+			ksft_exit_fail_msg("[FAIL]\t%s:%d\t%s:%s\n",		\
+					   __func__, __LINE__, (description),	\
+					   strerror(errno));			\
 		}								\
 	} while (0)
 
@@ -122,6 +122,7 @@ static void mremap_dontunmap_simple()
 	       "unable to unmap destination mapping");
 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
 	       "unable to unmap source mapping");
+	ksft_test_result_pass("%s\n", __func__);
 }
 
 // This test validates that MREMAP_DONTUNMAP on a shared mapping works as expected.
@@ -173,6 +174,7 @@ static void mremap_dontunmap_simple_shmem()
 	       "unable to unmap destination mapping");
 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
 	       "unable to unmap source mapping");
+	ksft_test_result_pass("%s\n", __func__);
 }
 
 // This test validates MREMAP_DONTUNMAP will move page tables to a specific
@@ -219,6 +221,7 @@ static void mremap_dontunmap_simple_fixed()
 	       "unable to unmap destination mapping");
 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
 	       "unable to unmap source mapping");
+	ksft_test_result_pass("%s\n", __func__);
 }
 
 // This test validates that we can MREMAP_DONTUNMAP for a portion of an
@@ -269,6 +272,7 @@ static void mremap_dontunmap_partial_mapping()
 	       "unable to unmap destination mapping");
 	BUG_ON(munmap(source_mapping, num_pages * page_size) == -1,
 	       "unable to unmap source mapping");
+	ksft_test_result_pass("%s\n", __func__);
 }
 
 // This test validates that we can remap over only a portion of a mapping.
@@ -328,19 +332,24 @@ static void mremap_dontunmap_partial_mapping_overwrite(void)
 	       "unable to unmap destination mapping");
 	BUG_ON(munmap(source_mapping, 5 * page_size) == -1,
 	       "unable to unmap source mapping");
+	ksft_test_result_pass("%s\n", __func__);
 }
 
 int main(void)
 {
+	ksft_print_header();
+
 	page_size = sysconf(_SC_PAGE_SIZE);
 
 	// test for kernel support for MREMAP_DONTUNMAP skipping the test if
 	// not.
 	if (kernel_support_for_mremap_dontunmap() != 0) {
-		printf("No kernel support for MREMAP_DONTUNMAP\n");
-		return KSFT_SKIP;
+		ksft_print_msg("No kernel support for MREMAP_DONTUNMAP\n");
+		ksft_finished();
 	}
 
+	ksft_set_plan(5);
+
 	// Keep a page sized buffer around for when we need it.
 	page_buffer =
 	    mmap(NULL, page_size, PROT_READ | PROT_WRITE,
@@ -356,6 +365,5 @@ int main(void)
 	BUG_ON(munmap(page_buffer, page_size) == -1,
 	       "unable to unmap page buffer");
 
-	printf("OK\n");
-	return 0;
+	ksft_finished();
 }