Merge tag 'mm-hotfixes-stable-2026-07-06-17-49' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mmHEADmaster

Pull misc fixes from Andrew Morton:
 "20 hotfixes. 17 are for MM. 12 are cc:stable and the remaining 8
  address post-7.1 issues or aren't considered suitable for backporting.

  Two patches from SJ addresses a couple of quite old DAMON issues. And
  two patches from Yichong Chen fixes tools/virtio build issues. The
  remaining patches are singletons"

* tag 'mm-hotfixes-stable-2026-07-06-17-49' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  tools/include: include stdint.h for SIZE_MAX in overflow.h
  tools/virtio: add missing compat definitions for vhost_net_test
  mm: do file ownership checks with the proper mount idmap
  samples/damon/mtier: fail early if address range parameters are invalid
  mm: a second pagecache maintainer
  mm/damon: add a kernel-doc comment for damon_ctx->rnd_state
  mm/damon: add a kernel-doc comment for damon_ctx->probes
  mailmap: add entries for Radu Rendec
  selftests/mm: hmm-tests: include linux/mman.h to access MADV_COLLAPSE
  selftests/mm: pagemap_ioctl: use the correct page size for transact_test()
  fs/proc: fix KPF_KSM reported for all anonymous pages
  mm: page_ext: add count limit to page_ext_iter_next to prevent invalid PFN access
  mm/damon/ops-common: handle extreme intervals in damon_hot_score()
  MAINTAINERS: add Lance as an rmap reviewer
  mm/compaction: handle free_pages_prepare() properly in compaction_free()
  mm/damon/sysfs-schemes: put stats for scheme_add_dirs() internal error
  mm/damon/sysfs-schemes: fix dir put orders in access_pattern_add_dirs()
  mm: shrinker: fix NULL pointer dereference in debugfs
  mm: shrinker: fix shrinker_info teardown race with expansion
  selftests/mm: fix ksft_process_madv.sh test category

1 files changed, 3 insertions, 4 deletions

diff --git a/mm/compaction.c b/mm/compaction.c
index b776f35ad020..f08765ade014 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1875,15 +1875,14 @@ static void compaction_free(struct folio *dst, unsigned long data)
 	int order = folio_order(dst);
 	struct page *page = &dst->page;
 
-	if (folio_put_testzero(dst)) {
-		free_pages_prepare(page, order);
+	if (folio_put_testzero(dst) && free_pages_prepare(page, order)) {
 		list_add(&dst->lru, &cc->freepages[order]);
 		cc->nr_freepages += 1 << order;
 	}
 	cc->nr_migratepages += 1 << order;
 	/*
-	 * someone else has referenced the page, we cannot take it back to our
-	 * free list.
+	 * someone else has referenced the page or free_pages_prepare() fails,
+	 * we cannot take it back to our free list.
 	 */
 }