[PATCH io_uring-7.1 10/16] io_uring/zcrx: warn on alloc with non-empty pp cache
From: Pavel Begunkov <asml.silence@gmail.com>
Date: 2026-03-23 12:44:16
Also in:
io-uring
Subsystem:
io_uring, io_uring zcrx, the rest · Maintainers:
Jens Axboe, Pavel Begunkov, Linus Torvalds
Page pool ensures the cache is empty before asking to refill it. Warn if the assumption is violated. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> --- io_uring/zcrx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index b4352c7b2d84..04718a3f2831 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c@@ -1073,8 +1073,8 @@ static netmem_ref io_pp_zc_alloc_netmems(struct page_pool *pp, gfp_t gfp) struct io_zcrx_ifq *ifq = io_pp_to_ifq(pp); /* pp should already be ensuring that */ - if (unlikely(pp->alloc.count)) - goto out_return; + if (WARN_ON_ONCE(pp->alloc.count)) + return 0; io_zcrx_ring_refill(pp, ifq); if (likely(pp->alloc.count))
--
2.53.0