diff options
| author | Longlong Xia <xialonglong@kylinos.cn> | 2026-08-23 12:40:51 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-09-17 22:42:40 -0700 |
| commit | a363c62a653cc8b3e21da9545fa4e028ef50f9c3 (patch) | |
| tree | 58385b504d4647430aa79521dc718a361e2ccebe | |
| parent | 7891fbb9512f127826e1d5dbf380ee212bd15eb0 (diff) | |
| download | linux-next-a363c62a653cc8b3e21da9545fa4e028ef50f9c3.tar.gz linux-next-a363c62a653cc8b3e21da9545fa4e028ef50f9c3.zip | |
mm/hugetlb: do not dissolve gigantic pages without runtime support
dissolve_free_hugetlb_folio() doesn't check
hstate_is_gigantic_no_runtime(h) though remove_hugetlb_folio()/
update_and_free_hugetlb_folio() silently bail for such folios, so it frees
a still-listed folio and, on vmemmap restore failure, the
add_hugetlb_folio() rollback corrupts the free list.
Link: https://lore.kernel.org/20260823044118.1097121-2-xialonglong2025@163.com
Fixes: 6eb4e88a6d27 ("hugetlb: create remove_hugetlb_page() to separate functionality")
Signed-off-by: Longlong Xia <xialonglong@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Assisted-by: Codex:gpt-5.6-sol
Acked-by: Muchun Song <muchun.song@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: <stable@vger.kernel.org>
| -rw-r--r-- | mm/hugetlb.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 4f6f58bf3db6..d28972cd33f5 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1967,6 +1967,15 @@ retry: struct hstate *h = folio_hstate(folio); bool adjust_surplus = false; + /* + * remove_hugetlb_folio()/update_and_free_hugetlb_folio() bail + * for gigantic hstates without runtime support, so dissolving one + * here would leave it on the free list and, on vmemmap restore + * failure, the add_hugetlb_folio() rollback corrupts that list. + */ + if (hstate_is_gigantic_no_runtime(h)) + goto out; + if (!available_huge_pages(h)) goto out; |