selftests/mm: transhuge-stress: conform 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/20240202113119.2047740-12-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/transhuge-stress.c

@@ -16,6 +16,7 @@
 #include <string.h>
 #include <sys/mman.h>
 #include "vm_util.h"
+#include "../kselftest.h"
 
 int backing_fd = -1;
 int mmap_flags = MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE;
@@ -34,6 +35,8 @@ int main(int argc, char **argv)
 	int pagemap_fd;
 	int duration = 0;
 
+	ksft_print_header();
+
 	ram = sysconf(_SC_PHYS_PAGES);
 	if (ram > SIZE_MAX / psize() / 4)
 		ram = SIZE_MAX / 4;
@@ -43,7 +46,8 @@ int main(int argc, char **argv)
 
 	while (++i < argc) {
 		if (!strcmp(argv[i], "-h"))
-			errx(1, "usage: %s [-f <filename>] [-d <duration>] [size in MiB]", argv[0]);
+			ksft_exit_fail_msg("usage: %s [-f <filename>] [-d <duration>] [size in MiB]\n",
+					   argv[0]);
 		else if (!strcmp(argv[i], "-f"))
 			name = argv[++i];
 		else if (!strcmp(argv[i], "-d"))
@@ -52,10 +56,12 @@ int main(int argc, char **argv)
 			len = atoll(argv[i]) << 20;
 	}
 
+	ksft_set_plan(1);
+
 	if (name) {
 		backing_fd = open(name, O_RDWR);
 		if (backing_fd == -1)
-			errx(2, "open %s", name);
+			ksft_exit_fail_msg("open %s\n", name);
 		mmap_flags = MAP_SHARED;
 	}
 
@@ -65,21 +71,21 @@ int main(int argc, char **argv)
 
 	pagemap_fd = open("/proc/self/pagemap", O_RDONLY);
 	if (pagemap_fd < 0)
-		err(2, "open pagemap");
+		ksft_exit_fail_msg("open pagemap\n");
 
 	len -= len % HPAGE_SIZE;
 	ptr = mmap(NULL, len + HPAGE_SIZE, PROT_RW, mmap_flags, backing_fd, 0);
 	if (ptr == MAP_FAILED)
-		err(2, "initial mmap");
+		ksft_exit_fail_msg("initial mmap");
 	ptr += HPAGE_SIZE - (uintptr_t)ptr % HPAGE_SIZE;
 
 	if (madvise(ptr, len, MADV_HUGEPAGE))
-		err(2, "MADV_HUGEPAGE");
+		ksft_exit_fail_msg("MADV_HUGEPAGE");
 
 	map_len = ram >> (HPAGE_SHIFT - 1);
 	map = malloc(map_len);
 	if (!map)
-		errx(2, "map malloc");
+		ksft_exit_fail_msg("map malloc\n");
 
 	clock_gettime(CLOCK_MONOTONIC, &start);
 
@@ -103,7 +109,7 @@ int main(int argc, char **argv)
 				if (idx >= map_len) {
 					map = realloc(map, idx + 1);
 					if (!map)
-						errx(2, "map realloc");
+						ksft_exit_fail_msg("map realloc\n");
 					memset(map + map_len, 0, idx + 1 - map_len);
 					map_len = idx + 1;
 				}
@@ -114,17 +120,19 @@ int main(int argc, char **argv)
 
 			/* split transhuge page, keep last page */
 			if (madvise(p, HPAGE_SIZE - psize(), MADV_DONTNEED))
-				err(2, "MADV_DONTNEED");
+				ksft_exit_fail_msg("MADV_DONTNEED");
 		}
 		clock_gettime(CLOCK_MONOTONIC, &b);
 		s = b.tv_sec - a.tv_sec + (b.tv_nsec - a.tv_nsec) / 1000000000.;
 
-		warnx("%.3f s/loop, %.3f ms/page, %10.3f MiB/s\t"
-		      "%4d succeed, %4d failed, %4d different pages",
+		ksft_print_msg("%.3f s/loop, %.3f ms/page, %10.3f MiB/s\t"
+			       "%4d succeed, %4d failed, %4d different pages\n",
 			       s, s * 1000 / (len >> HPAGE_SHIFT), len / s / (1 << 20),
 			       nr_succeed, nr_failed, nr_pages);
 
-		if (duration > 0 && b.tv_sec - start.tv_sec >= duration)
-			return 0;
+		if (duration > 0 && b.tv_sec - start.tv_sec >= duration) {
+			ksft_test_result_pass("Completed\n");
+			ksft_finished();
+		}
 	}
 }

tools/testing/selftests/mm/vm_util.c

@@ -232,17 +232,17 @@ int64_t allocate_transhuge(void *ptr, int pagemap_fd)
 	if (mmap(ptr, HPAGE_SIZE, PROT_READ | PROT_WRITE,
 		 MAP_FIXED | MAP_ANONYMOUS |
 		 MAP_NORESERVE | MAP_PRIVATE, -1, 0) != ptr)
-		errx(2, "mmap transhuge");
+		ksft_exit_fail_msg("mmap transhuge\n");
 
 	if (madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE))
-		err(2, "MADV_HUGEPAGE");
+		ksft_exit_fail_msg("MADV_HUGEPAGE\n");
 
 	/* allocate transparent huge page */
 	*(volatile void **)ptr = ptr;
 
 	if (pread(pagemap_fd, ent, sizeof(ent),
 		  (uintptr_t)ptr >> (pshift() - 3)) != sizeof(ent))
-		err(2, "read pagemap");
+		ksft_exit_fail_msg("read pagemap\n");
 
 	if (PAGEMAP_PRESENT(ent[0]) && PAGEMAP_PRESENT(ent[1]) &&
 	    PAGEMAP_PFN(ent[0]) + 1 == PAGEMAP_PFN(ent[1]) &&