[PATCH v4 1/4] mm/filemap: return early if failed to allocate memory for split

Kairui Song
2024-04-16T07:17:48Z

xas_split_alloc could fail with NOMEM, and in such case, it should abort
early instead of keep going and fail the xas_split below.

Signed-off-by: Kairui Song <kasong@tencent.com>
Acked-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
mm/filemap.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 30de18c4fd28..d447b36ffd41 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -880,9 +880,12 @@ noinline int __filemap_add_folio(struct address_space *mapping,
unsigned int order = xa_get_order(xas.xa, xas.xa_index);
void *entry, *old = NULL;

- if (order > folio_order(folio))
+ if (order > folio_order(folio)) {
xas_split_alloc(&xas, xa_load(xas.xa, xas.xa_index),
order, gfp);
+ if (xas_error(&xas))
+ goto error;
+ }
xas_lock_irq(&xas);
xas_for_each_conflict(&xas, entry) {
old = entry;
--
2.44.0