[Devel] [PATCH RHEL10 COMMIT] ms/selftests/mm: fix -Wmaybe-uninitialized warnings

[Konstantin Khorenko]

The commit is pushed to "branch-rh10-6.12.0-55.52.1.4.x.vz10-ovz" and will appear at git at bitbucket.org:openvz/vzkernel.git
after rh10-6.12.0-55.52.1.4.11.vz10
------>
commit ad0d6ce907a92d3dc5a80a7230f514e3afa9c4b5
Author: Kevin Brodsky <kevin.brodsky at arm.com>
Date:   Mon Mar 23 18:07:31 2026 +0100

    ms/selftests/mm: fix -Wmaybe-uninitialized warnings
    
    A few -Wmaybe-uninitialized warnings show up when building the mm tests
    with -O2.  None of them looks worrying; silence them by initialising the
    problematic variables.
    
    Link: https://lkml.kernel.org/r/20241209095019.1732120-3-kevin.brodsky@arm.com
    Signed-off-by: Kevin Brodsky <kevin.brodsky at arm.com>
    Cc: Aruna Ramakrishna <aruna.ramakrishna at oracle.com>
    Cc: Catalin Marinas <catalin.marinas at arm.com>
    Cc: Dave Hansen <dave.hansen at linux.intel.com>
    Cc: Joey Gouly <joey.gouly at arm.com>
    Cc: Keith Lucas <keith.lucas at oracle.com>
    Cc: Ryan Roberts <ryan.roberts at arm.com>
    Cc: Shuah Khan <shuah at kernel.org>
    Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
    
    (cherry picked from commit 516fb516383ef39d881d116c6447826356883ad0)
    Applied cleanly (minor context adjustment in uffd-unit-tests.c).
    
    https://virtuozzo.atlassian.net/browse/VSTOR-127529
    Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
    Reviewed-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
    Reviewed-by: Vasileios Almpanis <vasileios.almpanis at virtuozzo.com>
    
    Feature: fix selftests
---
 tools/testing/selftests/mm/ksm_tests.c       | 2 +-
 tools/testing/selftests/mm/mremap_test.c     | 2 +-
 tools/testing/selftests/mm/soft-dirty.c      | 2 +-
 tools/testing/selftests/mm/uffd-unit-tests.c | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c
index b748c48908d9d..dcdd5bb20f3d8 100644
--- a/tools/testing/selftests/mm/ksm_tests.c
+++ b/tools/testing/selftests/mm/ksm_tests.c
@@ -776,7 +776,7 @@ static int ksm_cow_time(int merge_type, int mapping, int prot, int timeout, size
 
 int main(int argc, char *argv[])
 {
-	int ret, opt;
+	int ret = 0, opt;
 	int prot = 0;
 	int ksm_scan_limit_sec = KSM_SCAN_LIMIT_SEC_DEFAULT;
 	int merge_type = KSM_MERGE_TYPE_DEFAULT;
diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index d207a52f2b5be..bb84476a177f1 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -384,7 +384,7 @@ static void mremap_move_within_range(unsigned int pattern_seed, char *rand_addr)
 static long long remap_region(struct config c, unsigned int threshold_mb,
 			      char *rand_addr)
 {
-	void *addr, *src_addr, *dest_addr, *dest_preamble_addr;
+	void *addr, *src_addr, *dest_addr, *dest_preamble_addr = NULL;
 	unsigned long long t, d;
 	struct timespec t_start = {0, 0}, t_end = {0, 0};
 	long long  start_ns, end_ns, align_mask, ret, offset;
diff --git a/tools/testing/selftests/mm/soft-dirty.c b/tools/testing/selftests/mm/soft-dirty.c
index bdfa5d085f009..8e1462ce05326 100644
--- a/tools/testing/selftests/mm/soft-dirty.c
+++ b/tools/testing/selftests/mm/soft-dirty.c
@@ -128,7 +128,7 @@ static void test_mprotect(int pagemap_fd, int pagesize, bool anon)
 {
 	const char *type[] = {"file", "anon"};
 	const char *fname = "./soft-dirty-test-file";
-	int test_fd;
+	int test_fd = 0;
 	char *map;
 
 	if (anon) {
diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c
index a2e71b1636e7c..795bba310151e 100644
--- a/tools/testing/selftests/mm/uffd-unit-tests.c
+++ b/tools/testing/selftests/mm/uffd-unit-tests.c
@@ -1122,7 +1122,7 @@ uffd_move_test_common(uffd_test_args_t *targs, unsigned long chunk_size,
 	char c;
 	unsigned long long count;
 	struct uffd_args args = { 0 };
-	char *orig_area_src, *orig_area_dst;
+	char *orig_area_src = NULL, *orig_area_dst = NULL;
 	unsigned long step_size, step_count;
 	unsigned long src_offs = 0;
 	unsigned long dst_offs = 0;