[merged mm-stable] selftests-mm-mlock-print-error-on-failure.patch removed from -mm tree

[merged mm-stable] selftests-mm-mlock-print-error-on-failure.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: selftests/mm/mlock: print error on failure
has been removed from the -mm tree.  Its filename was
     selftests-mm-mlock-print-error-on-failure.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Brendan Jackman <jackmanb@google.com>
Subject: selftests/mm/mlock: print error on failure
Date: Tue, 11 Mar 2025 13:18:23 +0000

It's not really possible to start diagnosing this without knowing the
actual error.

Also update the mlock2 helper to behave like libc would by setting errno
and returning -1.

Link: https://lkml.kernel.org/r/20250311-mm-selftests-v4-12-dec210a658f5@google.com
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/mlock-random-test.c |    4 ++--
 tools/testing/selftests/mm/mlock2.h            |    8 +++++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

--- a/tools/testing/selftests/mm/mlock2.h~selftests-mm-mlock-print-error-on-failure
+++ a/tools/testing/selftests/mm/mlock2.h
@@ -6,7 +6,13 @@
 
 static int mlock2_(void *start, size_t len, int flags)
 {
-	return syscall(__NR_mlock2, start, len, flags);
+	int ret = syscall(__NR_mlock2, start, len, flags);
+
+	if (ret) {
+		errno = ret;
+		return -1;
+	}
+	return 0;
 }
 
 static FILE *seek_to_smaps_entry(unsigned long addr)
--- a/tools/testing/selftests/mm/mlock-random-test.c~selftests-mm-mlock-print-error-on-failure
+++ a/tools/testing/selftests/mm/mlock-random-test.c
@@ -161,9 +161,9 @@ static void test_mlock_within_limit(char
 				       MLOCK_ONFAULT);
 
 		if (ret)
-			ksft_exit_fail_msg("%s() failure at |%p(%d)| mlock:|%p(%d)|\n",
+			ksft_exit_fail_msg("%s() failure (%s) at |%p(%d)| mlock:|%p(%d)|\n",
 					   is_mlock ? "mlock" : "mlock2",
-					   p, alloc_size,
+					   strerror(errno), p, alloc_size,
 					   p + start_offset, lock_size);
 	}
 
_

Patches currently in -mm which might be from jackmanb@google.com are

scripts-gdb-add-lx_per_cpu_ptr.patch