On 18.06.25 01:34, Andrew Morton wrote:
On Tue, 17 Jun 2025 16:35:32 +0200 David Hildenbrand <david@xxxxxxxxxx> wrote:is_zero_pfn() does not work for the huge zero folio. Fix it by using is_huge_zero_pmd(). Found by code inspection. Fixes: 52526ca7fdb9 ("fs/proc/task_mmu: implement IOCTL to get and optionally clear info about PTEs") Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Muhammad Usama Anjum <usama.anjum@xxxxxxxxxxxxx> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx> --- Probably we should Cc stable, thoughts?Depends on the userspace effects. I'm thinking these are "This can cause the PAGEMAP_SCAN ioctl against /proc/pid/pagemap to omit pages" so yup, cc:stable.
I think it will be included as PAGE_IS_PRESENT, but not as PAGE_IS_PFNZERO. That makes it a bit harder to judge the impact.
In any case, it's a simple patch and backporting should not really be hard (automatic).
-- Cheers, David / dhildenb
