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charset="utf-8" On configs where MAP_DROPPABLE is not supported (currently any 32-bit config except for PPC32), mmap fails with errno set to ENOTSUPP. However, ENOTSUPP is not a standard error value that userspace knows about. The acceptable userspace-visible errno to use is EOPNOTSUPP. checkpatch.pl has a warning to this affect. Fixes: 9651fcedf7b9 ("mm: add MAP_DROPPABLE for designating always lazily f= reeable mappings") Cc: Signed-off-by: Anthony Yznaga Acked-by: David Hildenbrand (Arm) --- mm/mmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/mmap.c b/mm/mmap.c index 5754d1c36462..2311ae7c2ff4 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -504,7 +504,7 @@ unsigned long do_mmap(struct file *file, unsigned long = addr, break; case MAP_DROPPABLE: if (VM_DROPPABLE =3D=3D VM_NONE) - return -ENOTSUPP; + return -EOPNOTSUPP; /* * A locked or stack area makes no sense to be droppable. * --=20 2.47.3 From nobody Sun Jun 14 08:21:08 2026 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E39751E9B3D; Thu, 2 Apr 2026 00:34:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.165.32 ARC-Seal: i=1; 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charset="utf-8" For configs that support MAP_DROPPABLE 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). Signed-off-by: Anthony Yznaga --- tools/testing/selftests/mm/mlock2-tests.c | 91 ++++++++++++++++++++--- 1 file changed, 82 insertions(+), 9 deletions(-) diff --git a/tools/testing/selftests/mm/mlock2-tests.c b/tools/testing/self= tests/mm/mlock2-tests.c index b474f2b20def..2750a3d6e8e4 100644 --- a/tools/testing/selftests/mm/mlock2-tests.c +++ b/tools/testing/selftests/mm/mlock2-tests.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #define _GNU_SOURCE #include +#include #include #include #include @@ -163,14 +164,17 @@ static int lock_check(unsigned long addr) return (vma_rss =3D=3D vma_size); } =20 -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); =20 - return 0; + return 1; } =20 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)); } =20 - 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); } =20 @@ -296,7 +300,7 @@ static void test_munlockall0(void) ksft_exit_fail_msg("munlockall(): %s\n", strerror(errno)); } =20 - ksft_test_result(!unlock_lock_check(map), "%s: No locked memory\n", __fun= c__); + ksft_test_result(!unlock_lock_check(map, true), "%s: No locked memory\n",= __func__); munmap(map, 2 * page_size); } =20 @@ -336,7 +340,74 @@ static void test_munlockall1(void) ksft_exit_fail_msg("munlockall() %s\n", strerror(errno)); } =20 - ksft_test_result(!unlock_lock_check(map), "%s: No locked memory\n", __fun= c__); + 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 =3D 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 =3D mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); + if (map =3D=3D MAP_FAILED) { + if (errno =3D=3D EOPNOTSUPP) { + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); + return; + } + ksft_exit_fail_msg("mmap error: %s\n", 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 no= t locked\n", + __func__); + + munmap(map, 2 * page_size); +} + +static void test_mlockall_future_droppable(void) +{ + char *map; + unsigned long page_size =3D getpagesize(); + + if (mlockall(MCL_CURRENT | MCL_FUTURE)) + ksft_exit_fail_msg("mlockall(MCL_CURRENT | MCL_FUTURE): %s\n", strerror(= errno)); + + map =3D mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); + + if (map =3D=3D MAP_FAILED) { + if (errno =3D=3D EOPNOTSUPP) { + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); + return; + } + ksft_exit_fail_msg("mmap error: %s\n", strerror(errno)); + } + + ksft_test_result(!unlock_lock_check(map, false), "%s: droppable memory no= t locked\n", + __func__); + + if (munlockall()) { + munmap(map, 2 * page_size); + ksft_exit_fail_msg("munlockall() %s\n", strerror(errno)); + } + munmap(map, 2 * page_size); } =20 @@ -442,7 +513,7 @@ int main(int argc, char **argv) =20 munmap(map, size); =20 - ksft_set_plan(13); + ksft_set_plan(15); =20 test_mlock_lock(); test_mlock_onfault(); @@ -451,6 +522,8 @@ int main(int argc, char **argv) test_lock_onfault_of_present(); test_vma_management(true); test_mlockall(); + test_mlock_droppable(); + test_mlockall_future_droppable(); =20 ksft_finished(); } --=20 2.47.3