selftests/memfd: fix -Wmaybe-uninitialized warning in memfd_test

Patch series "selftests/memfd: fix compilation warnings".

This patchset fixes warnings about unused but initialized variables, and
unused dummy buffer passed to pwrite() syscall in the tests.

This patch (of 2):

  memfd_test.c: In function 'mfd_fail_grow_write.part.0':
  memfd_test.c:685:13: warning: '<unknown>' may be used uninitialized
  [-Wmaybe-uninitialized]
    685 |         l = pwrite(fd, buf, mfd_def_size * 8, 0);
        |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

pwrite() is declared with attribute 'access (read_only, 2, 3)', so GCC
knows it reads from the buffer.  malloc() returns uninitialized memory,
hence the warning.  Use calloc() to zero-initialize the buffer.  The
actual contents don't matter here since the test verifies that pwrite()
fails on a sealed memfd.

Link: https://lore.kernel.org/20260524193732.48853-1-eva.kurchatova@virtuozzo.com
Link: https://lore.kernel.org/20260524193732.48853-2-eva.kurchatova@virtuozzo.com
Signed-off-by: Konstantin Khorenko <khorenko@virtuozzo.com>
Signed-off-by: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
Cc: Aristeu Rozanski <aris@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c
index 2ca07ea7202a5fd9ce81c02d840f328df4593f8d..cdab3a8376244a228a196db6691de6dd36899221 100644 (file)
--- a/tools/testing/selftests/memfd/memfd_test.c
+++ b/tools/testing/selftests/memfd/memfd_test.c
@@ -688,9 +688,9 @@ static void mfd_assert_grow_write(int fd)
        if (hugetlbfs_test)
                return;
 
-       buf = malloc(mfd_def_size * 8);
+       buf = calloc(1, mfd_def_size * 8);
        if (!buf) {
-               printf("malloc(%zu) failed: %m\n", mfd_def_size * 8);
+               printf("calloc(1, %zu) failed: %m\n", mfd_def_size * 8);
                abort();
        }