6.15-stable review patch. If anyone has any objections, please let me know.
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From: David Hildenbrand david@redhat.com
commit 517f496e1e61bd169d585dab4dd77e7147506322 upstream.
After commit 1aaf8c122918 ("mm: gup: fix infinite loop within __get_longterm_locked") we are able to longterm pin folios that are not supposed to get longterm pinned, simply because they temporarily have the LRU flag cleared (esp. temporarily isolated).
For example, two __get_longterm_locked() callers can race, or __get_longterm_locked() can race with anything else that temporarily isolates folios.
The introducing commit mentions the use case of a driver that uses vm_ops->fault to insert pages allocated through cma_alloc() into the page tables, assuming they can later get longterm pinned. These pages/ folios would never have the LRU flag set and consequently cannot get isolated. There is no known in-tree user making use of that so far, fortunately.
To handle that in the future -- and avoid retrying forever to isolate/migrate them -- we will need a different mechanism for the CMA area *owner* to indicate that it actually already allocated the page and is fine with longterm pinning it. The LRU flag is not suitable for that.
Probably we can lookup the relevant CMA area and query the bitmap; we only have have to care about some races, probably. If already allocated, we could just allow longterm pinning)
Anyhow, let's fix the "must not be longterm pinned" problem first by reverting the original commit.
Link: https://lkml.kernel.org/r/20250611131314.594529-1-david@redhat.com Fixes: 1aaf8c122918 ("mm: gup: fix infinite loop within __get_longterm_locked") Signed-off-by: David Hildenbrand david@redhat.com Closes: https://lore.kernel.org/all/20250522092755.GA3277597@tiffany/ Reported-by: Hyesoo Yu hyesoo.yu@samsung.com Reviewed-by: John Hubbard jhubbard@nvidia.com Cc: Jason Gunthorpe jgg@ziepe.ca Cc: Peter Xu peterx@redhat.com Cc: Zhaoyang Huang zhaoyang.huang@unisoc.com Cc: Aijun Sun aijun.sun@unisoc.com Cc: Alistair Popple apopple@nvidia.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- mm/gup.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-)
--- a/mm/gup.c +++ b/mm/gup.c @@ -2320,13 +2320,13 @@ static void pofs_unpin(struct pages_or_f /* * Returns the number of collected folios. Return value is always >= 0. */ -static void collect_longterm_unpinnable_folios( +static unsigned long collect_longterm_unpinnable_folios( struct list_head *movable_folio_list, struct pages_or_folios *pofs) { + unsigned long i, collected = 0; struct folio *prev_folio = NULL; bool drain_allow = true; - unsigned long i;
for (i = 0; i < pofs->nr_entries; i++) { struct folio *folio = pofs_get_folio(pofs, i); @@ -2338,6 +2338,8 @@ static void collect_longterm_unpinnable_ if (folio_is_longterm_pinnable(folio)) continue;
+ collected++; + if (folio_is_device_coherent(folio)) continue;
@@ -2359,6 +2361,8 @@ static void collect_longterm_unpinnable_ NR_ISOLATED_ANON + folio_is_file_lru(folio), folio_nr_pages(folio)); } + + return collected; }
/* @@ -2435,9 +2439,11 @@ static long check_and_migrate_movable_pages_or_folios(struct pages_or_folios *pofs) { LIST_HEAD(movable_folio_list); + unsigned long collected;
- collect_longterm_unpinnable_folios(&movable_folio_list, pofs); - if (list_empty(&movable_folio_list)) + collected = collect_longterm_unpinnable_folios(&movable_folio_list, + pofs); + if (!collected) return 0;
return migrate_longterm_unpinnable_folios(&movable_folio_list, pofs);