[merged mm-stable] selftests-mm-verify-droppable-mappings-cannot-be-locked.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: selftests/mm: verify droppable mappings cannot be locked
has been removed from the -mm tree.  Its filename was
     selftests-mm-verify-droppable-mappings-cannot-be-locked.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: Anthony Yznaga <anthony.yznaga@oracle.com>
Subject: selftests/mm: verify droppable mappings cannot be locked
Date: Tue, 10 Mar 2026 08:58:21 -0700

Verify that a mapping created with MAP_DROPPABLE cannot be locked via
mlock(), and that it will not be locked if it's created after
mlockall(MCL_FUTURE).

Link: https://lkml.kernel.org/r/20260310155821.17869-2-anthony.yznaga@oracle.com
Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: Pedro Falcato <pfalcato@suse.de>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Tested-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jann Horn <jannh@google.com>
Cc: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/mlock2-tests.c |   78 +++++++++++++++++---
 1 file changed, 69 insertions(+), 9 deletions(-)

--- a/tools/testing/selftests/mm/mlock2-tests.c~selftests-mm-verify-droppable-mappings-cannot-be-locked
+++ a/tools/testing/selftests/mm/mlock2-tests.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0
 #define _GNU_SOURCE
 #include <sys/mman.h>
+#include <linux/mman.h>
 #include <stdint.h>
 #include <unistd.h>
 #include <string.h>
@@ -163,14 +164,17 @@ static int lock_check(unsigned long addr
 	return (vma_rss == vma_size);
 }
 
-static int unlock_lock_check(char *map)
+static int unlock_lock_check(char *map, bool mlock_supported)
 {
-	if (is_vmflag_set((unsigned long)map, LOCKED)) {
+	if (!is_vmflag_set((unsigned long)map, LOCKED))
+		return 0;
+
+	if (mlock_supported)
 		ksft_print_msg("VMA flag %s is present on page 1 after unlock\n", LOCKED);
-		return 1;
-	}
+	else
+		ksft_print_msg("VMA flag %s is present on an unsupported VMA\n", LOCKED);
 
-	return 0;
+	return 1;
 }
 
 static void test_mlock_lock(void)
@@ -196,7 +200,7 @@ static void test_mlock_lock(void)
 		ksft_exit_fail_msg("munlock(): %s\n", strerror(errno));
 	}
 
-	ksft_test_result(!unlock_lock_check(map), "%s: Unlocked\n", __func__);
+	ksft_test_result(!unlock_lock_check(map, true), "%s: Unlocked\n", __func__);
 	munmap(map, 2 * page_size);
 }
 
@@ -296,7 +300,7 @@ static void test_munlockall0(void)
 		ksft_exit_fail_msg("munlockall(): %s\n", strerror(errno));
 	}
 
-	ksft_test_result(!unlock_lock_check(map), "%s: No locked memory\n", __func__);
+	ksft_test_result(!unlock_lock_check(map, true), "%s: No locked memory\n", __func__);
 	munmap(map, 2 * page_size);
 }
 
@@ -336,7 +340,61 @@ static void test_munlockall1(void)
 		ksft_exit_fail_msg("munlockall() %s\n", strerror(errno));
 	}
 
-	ksft_test_result(!unlock_lock_check(map), "%s: No locked memory\n", __func__);
+	ksft_test_result(!unlock_lock_check(map, true), "%s: No locked memory\n", __func__);
+	munmap(map, 2 * page_size);
+}
+
+/*
+ * Droppable memory should not be lockable.
+ */
+static void test_mlock_droppable(void)
+{
+	char *map;
+	unsigned long page_size = getpagesize();
+
+	/*
+	 * Ensure MCL_FUTURE is not set.
+	 */
+	if (mlockall(MCL_CURRENT))
+		ksft_exit_fail_msg("mlockall(MCL_CURRENT): %s\n", strerror(errno));
+	if (munlockall())
+		ksft_exit_fail_msg("munlockall() %s\n", strerror(errno));
+
+	map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
+		   MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0);
+	if (map == MAP_FAILED)
+		ksft_exit_fail_msg("mmap error: %s", strerror(errno));
+
+	if (mlock2_(map, 2 * page_size, 0)) {
+		munmap(map, 2 * page_size);
+		ksft_exit_fail_msg("mlock2(0): %s\n", strerror(errno));
+	}
+
+	ksft_test_result(!unlock_lock_check(map, false), "%s: droppable memory not locked\n",
+			__func__);
+
+	munmap(map, 2 * page_size);
+}
+
+static void test_mlockall_future_droppable(void)
+{
+	char *map;
+	unsigned long page_size = getpagesize();
+
+	if (mlockall(MCL_CURRENT | MCL_FUTURE))
+		ksft_exit_fail_msg("mlockall(MCL_CURRENT | MCL_FUTURE): %s\n", strerror(errno));
+
+	map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
+		   MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0);
+
+	ksft_test_result(!unlock_lock_check(map, false), "%s: droppable memory not locked\n",
+			__func__);
+
+	if (munlockall()) {
+		munmap(map, 2 * page_size);
+		ksft_exit_fail_msg("munlockall() %s\n", strerror(errno));
+	}
+
 	munmap(map, 2 * page_size);
 }
 
@@ -442,7 +500,7 @@ int main(int argc, char **argv)
 
 	munmap(map, size);
 
-	ksft_set_plan(13);
+	ksft_set_plan(15);
 
 	test_mlock_lock();
 	test_mlock_onfault();
@@ -451,6 +509,8 @@ int main(int argc, char **argv)
 	test_lock_onfault_of_present();
 	test_vma_management(true);
 	test_mlockall();
+	test_mlock_droppable();
+	test_mlockall_future_droppable();
 
 	ksft_finished();
 }
_

Patches currently in -mm which might be from anthony.yznaga@oracle.com are