Message-Id: <20250515-selftests-mm-gup-longterm-dups-v1-1-05f8f731cf63@kernel.org>
Date: Thu, 15 May 2025 10:57:43 +0200
From: Mark Brown <broonie@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 Shuah Khan <shuah@...nel.org>
Cc: linux-mm@...ck.org, linux-kselftest@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH] selftests/mm: Fix test result reporting in gup_longterm

The kselftest framework uses the string logged when a test result is
reported as the unique identifier for a test, using it to track test
results between runs. The gup_longterm test completely fails to follow
this pattern, it runs a single test function repeatedly with various
parameters but each result report is a string logging an error message
which is fixed between runs.

Since the code already logs each test uniquely before it starts refactor
to also print this to a buffer, then use that name as the test result.
This isn't especially pretty, really this test could use a more
substantial cleanup.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/mm/gup_longterm.c | 163 ++++++++++++++++++++----------
 1 file changed, 107 insertions(+), 56 deletions(-)

diff --git a/tools/testing/selftests/mm/gup_longterm.c b/tools/testing/selftests/mm/gup_longterm.c
index 21595b20bbc3..a849537f9372 100644
--- a/tools/testing/selftests/mm/gup_longterm.c
+++ b/tools/testing/selftests/mm/gup_longterm.c
@@ -35,6 +35,8 @@ static int nr_hugetlbsizes;
 static size_t hugetlbsizes[10];
 static int gup_fd;
 
+static char test_name[1024];
+
 static __fsword_t get_fs_type(int fd)
 {
 	struct statfs fs;
@@ -93,33 +95,48 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 	__fsword_t fs_type = get_fs_type(fd);
 	bool should_work;
 	char *mem;
+	int result = KSFT_PASS;
 	int ret;
 
+	if (fd < 0) {
+		result = KSFT_FAIL;
+		goto report;
+	}
+
 	if (ftruncate(fd, size)) {
 		if (errno == ENOENT) {
 			skip_test_dodgy_fs("ftruncate()");
 		} else {
-			ksft_test_result_fail("ftruncate() failed (%s)\n", strerror(errno));
+			ksft_print_msg("ftruncate() failed (%s)\n",
+				       strerror(errno));
+			result = KSFT_FAIL;
+			goto report;
 		}
 		return;
 	}
 
 	if (fallocate(fd, 0, 0, size)) {
-		if (size == pagesize)
-			ksft_test_result_fail("fallocate() failed (%s)\n", strerror(errno));
-		else
-			ksft_test_result_skip("need more free huge pages\n");
-		return;
+		if (size == pagesize) {
+			ksft_print_msg("fallocate() failed (%s)\n", strerror(errno));
+			result = KSFT_FAIL;
+		} else {
+			ksft_print_msg("need more free huge pages\n");
+			result = KSFT_SKIP;
+		}
+		goto report;
 	}
 
 	mem = mmap(NULL, size, PROT_READ | PROT_WRITE,
 		   shared ? MAP_SHARED : MAP_PRIVATE, fd, 0);
 	if (mem == MAP_FAILED) {
-		if (size == pagesize || shared)
-			ksft_test_result_fail("mmap() failed (%s)\n", strerror(errno));
-		else
-			ksft_test_result_skip("need more free huge pages\n");
-		return;
+		if (size == pagesize || shared) {
+			ksft_print_msg("mmap() failed (%s)\n", strerror(errno));
+			result = KSFT_FAIL;
+		} else {
+			ksft_print_msg("need more free huge pages\n");
+			result = KSFT_SKIP;
+		}
+		goto report;
 	}
 
 	/* Fault in the page such that GUP-fast can pin it directly. */
@@ -134,7 +151,8 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 		 */
 		ret = mprotect(mem, size, PROT_READ);
 		if (ret) {
-			ksft_test_result_fail("mprotect() failed (%s)\n", strerror(errno));
+			ksft_print_msg("mprotect() failed (%s)\n", strerror(errno));
+			result = KSFT_FAIL;
 			goto munmap;
 		}
 		/* FALLTHROUGH */
@@ -147,12 +165,14 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 				type == TEST_TYPE_RW_FAST;
 
 		if (gup_fd < 0) {
-			ksft_test_result_skip("gup_test not available\n");
+			ksft_print_msg("gup_test not available\n");
+			result = KSFT_SKIP;
 			break;
 		}
 
 		if (rw && shared && fs_is_unknown(fs_type)) {
-			ksft_test_result_skip("Unknown filesystem\n");
+			ksft_print_msg("Unknown filesystem\n");
+			result = KSFT_SKIP;
 			return;
 		}
 		/*
@@ -169,14 +189,19 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 		args.flags |= rw ? PIN_LONGTERM_TEST_FLAG_USE_WRITE : 0;
 		ret = ioctl(gup_fd, PIN_LONGTERM_TEST_START, &args);
 		if (ret && errno == EINVAL) {
-			ksft_test_result_skip("PIN_LONGTERM_TEST_START failed (EINVAL)n");
+			ksft_print_msg("PIN_LONGTERM_TEST_START failed (EINVAL)n");
+			result = KSFT_SKIP;
 			break;
 		} else if (ret && errno == EFAULT) {
-			ksft_test_result(!should_work, "Should have failed\n");
+			if (should_work)
+				result = KSFT_FAIL;
+			else
+				result = KSFT_PASS;
 			break;
 		} else if (ret) {
-			ksft_test_result_fail("PIN_LONGTERM_TEST_START failed (%s)\n",
-					      strerror(errno));
+			ksft_print_msg("PIN_LONGTERM_TEST_START failed (%s)\n",
+				       strerror(errno));
+			result = KSFT_FAIL;
 			break;
 		}
 
@@ -189,7 +214,10 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 		 * some previously unsupported filesystems, we might want to
 		 * perform some additional tests for possible data corruptions.
 		 */
-		ksft_test_result(should_work, "Should have worked\n");
+		if (should_work)
+			result = KSFT_PASS;
+		else
+			result = KSFT_FAIL;
 		break;
 	}
 #ifdef LOCAL_CONFIG_HAVE_LIBURING
@@ -199,8 +227,9 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 
 		/* io_uring always pins pages writable. */
 		if (shared && fs_is_unknown(fs_type)) {
-			ksft_test_result_skip("Unknown filesystem\n");
-			return;
+			ksft_print_msg("Unknown filesystem\n");
+			result = KSFT_SKIP;
+			goto report;
 		}
 		should_work = !shared ||
 			      fs_supports_writable_longterm_pinning(fs_type);
@@ -208,8 +237,9 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 		/* Skip on errors, as we might just lack kernel support. */
 		ret = io_uring_queue_init(1, &ring, 0);
 		if (ret < 0) {
-			ksft_test_result_skip("io_uring_queue_init() failed (%s)\n",
-					      strerror(-ret));
+			ksft_print_msg("io_uring_queue_init() failed (%s)\n",
+				       strerror(-ret));
+			result = KSFT_SKIP;
 			break;
 		}
 		/*
@@ -222,17 +252,28 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 		/* Only new kernels return EFAULT. */
 		if (ret && (errno == ENOSPC || errno == EOPNOTSUPP ||
 			    errno == EFAULT)) {
-			ksft_test_result(!should_work, "Should have failed (%s)\n",
-					 strerror(errno));
+			if (should_work) {
+				ksft_print_msg("Should have failed (%s)\n",
+					       strerror(errno));
+				result = KSFT_FAIL;
+			} else {
+				result = KSFT_PASS;
+			}
 		} else if (ret) {
 			/*
 			 * We might just lack support or have insufficient
 			 * MEMLOCK limits.
 			 */
-			ksft_test_result_skip("io_uring_register_buffers() failed (%s)\n",
-					      strerror(-ret));
+			ksft_print_msg("io_uring_register_buffers() failed (%s)\n",
+				       strerror(-ret));
+			result = KSFT_SKIP;
 		} else {
-			ksft_test_result(should_work, "Should have worked\n");
+			if (should_work) {
+				result = KSFT_PASS;
+			} else {
+				ksft_print_msg("Should have worked\n");
+				result = KSFT_FAIL;
+			}
 			io_uring_unregister_buffers(&ring);
 		}
 
@@ -246,21 +287,32 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
 
 munmap:
 	munmap(mem, size);
+report:
+	ksft_test_result(result, "%s\n", test_name);
 }
 
 typedef void (*test_fn)(int fd, size_t size);
 
+static void log_test_start(const char *name, ...)
+{
+	va_list args;
+	va_start(args, name);
+
+	vsnprintf(test_name, sizeof(test_name), name, args);
+	ksft_print_msg("[RUN] %s\n", test_name);
+
+	va_end(args);
+}
+
 static void run_with_memfd(test_fn fn, const char *desc)
 {
 	int fd;
 
-	ksft_print_msg("[RUN] %s ... with memfd\n", desc);
+	log_test_start("%s ... with memfd", desc);
 
 	fd = memfd_create("test", 0);
-	if (fd < 0) {
-		ksft_test_result_fail("memfd_create() failed (%s)\n", strerror(errno));
-		return;
-	}
+	if (fd < 0)
+		ksft_print_msg("memfd_create() failed (%s)\n", strerror(errno));
 
 	fn(fd, pagesize);
 	close(fd);
@@ -271,23 +323,23 @@ static void run_with_tmpfile(test_fn fn, const char *desc)
 	FILE *file;
 	int fd;
 
-	ksft_print_msg("[RUN] %s ... with tmpfile\n", desc);
+	log_test_start("%s ... with tmpfile", desc);
 
 	file = tmpfile();
 	if (!file) {
-		ksft_test_result_fail("tmpfile() failed (%s)\n", strerror(errno));
-		return;
-	}
-
-	fd = fileno(file);
-	if (fd < 0) {
-		ksft_test_result_fail("fileno() failed (%s)\n", strerror(errno));
-		goto close;
+		ksft_print_msg("tmpfile() failed (%s)\n", strerror(errno));
+		fd = -1;
+	} else {
+		fd = fileno(file);
+		if (fd < 0) {
+			ksft_print_msg("fileno() failed (%s)\n", strerror(errno));
+		}
 	}
 
 	fn(fd, pagesize);
-close:
-	fclose(file);
+
+	if (file)
+		fclose(file);
 }
 
 static void run_with_local_tmpfile(test_fn fn, const char *desc)
@@ -295,22 +347,22 @@ static void run_with_local_tmpfile(test_fn fn, const char *desc)
 	char filename[] = __FILE__"_tmpfile_XXXXXX";
 	int fd;
 
-	ksft_print_msg("[RUN] %s ... with local tmpfile\n", desc);
+	log_test_start("%s ... with local tmpfile", desc);
 
 	fd = mkstemp(filename);
-	if (fd < 0) {
-		ksft_test_result_fail("mkstemp() failed (%s)\n", strerror(errno));
-		return;
-	}
+	if (fd < 0)
+		ksft_print_msg("mkstemp() failed (%s)\n", strerror(errno));
 
 	if (unlink(filename)) {
-		ksft_test_result_fail("unlink() failed (%s)\n", strerror(errno));
-		goto close;
+		ksft_print_msg("unlink() failed (%s)\n", strerror(errno));
+		close(fd);
+		fd = -1;
 	}
 
 	fn(fd, pagesize);
-close:
-	close(fd);
+
+	if (fd >= 0)
+		close(fd);
 }
 
 static void run_with_memfd_hugetlb(test_fn fn, const char *desc,
@@ -319,15 +371,14 @@ static void run_with_memfd_hugetlb(test_fn fn, const char *desc,
 	int flags = MFD_HUGETLB;
 	int fd;
 
-	ksft_print_msg("[RUN] %s ... with memfd hugetlb (%zu kB)\n", desc,
+	log_test_start("%s ... with memfd hugetlb (%zu kB)", desc,
 		       hugetlbsize / 1024);
 
 	flags |= __builtin_ctzll(hugetlbsize) << MFD_HUGE_SHIFT;
 
 	fd = memfd_create("test", flags);
 	if (fd < 0) {
-		ksft_test_result_skip("memfd_create() failed (%s)\n", strerror(errno));
-		return;
+		ksft_print_msg("memfd_create() failed (%s)\n", strerror(errno));
 	}
 
 	fn(fd, hugetlbsize);

---
base-commit: 82f2b0b97b36ee3fcddf0f0780a9a0825d52fec3
change-id: 20250514-selftests-mm-gup-longterm-dups-68aa4e0fcc88

Best regards,
-- 
Mark Brown <broonie@...nel.org>

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