diff options
| author | Steve Sistare <steven.sistare@oracle.com> | 2024-09-03 07:25:20 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-09-26 14:01:43 -0700 |
| commit | 9289f020da47ef04b28865589eeee3d56d4bafea (patch) | |
| tree | ae6d67b30630c49d5633035711789164ebde35f4 /mm/pagewalk.c | |
| parent | 26a8ea80929c518bdec5e53a5776f95919b7c88e (diff) | |
mm/gup: fix memfd_pin_folios hugetlb page allocation
When memfd_pin_folios -> memfd_alloc_folio creates a hugetlb page, the
index is wrong. The subsequent call to filemap_get_folios_contig thus
cannot find it, and fails, and memfd_pin_folios loops forever. To fix,
adjust the index for the huge_page_order.
memfd_alloc_folio also forgets to unlock the folio, so the next touch of
the page calls hugetlb_fault which blocks forever trying to take the lock.
Unlock it.
Link: https://lkml.kernel.org/r/1725373521-451395-5-git-send-email-steven.sistare@oracle.com
Fixes: 89c1905d9c14 ("mm/gup: introduce memfd_pin_folios() for pinning memfd folios")
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Acked-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/pagewalk.c')
0 files changed, 0 insertions, 0 deletions