From: Paolo Abeni <pabeni@redhat.com>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
"Jakub Kicinski" <kuba@kernel.org>,
"Jesper Dangaard Brouer" <hawk@kernel.org>,
"Saeed Mahameed" <saeedm@nvidia.com>,
"Leon Romanovsky" <leon@kernel.org>,
"Tariq Toukan" <tariqt@nvidia.com>,
"Andrew Lunn" <andrew+netdev@lunn.ch>,
"Eric Dumazet" <edumazet@google.com>,
"Ilias Apalodimas" <ilias.apalodimas@linaro.org>,
"Simon Horman" <horms@kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Mina Almasry" <almasrymina@google.com>,
"Yonglong Liu" <liuyonglong@huawei.com>,
"Yunsheng Lin" <linyunsheng@huawei.com>,
"Pavel Begunkov" <asml.silence@gmail.com>,
"Matthew Wilcox" <willy@infradead.org>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-rdma@vger.kernel.org, linux-mm@kvack.org,
Qiuling Ren <qren@redhat.com>, Yuying Ma <yuma@redhat.com>
Subject: Re: [PATCH net-next v5 2/2] page_pool: Track DMA-mapped pages and unmap them when destroying the pool
Date: Tue, 1 Apr 2025 10:52:17 +0200 [thread overview]
Message-ID: <38b9af46-0d03-424d-8ecc-461b7daf216c@redhat.com> (raw)
In-Reply-To: <20250328-page-pool-track-dma-v5-2-55002af683ad@redhat.com>
On 3/28/25 1:19 PM, Toke Høiland-Jørgensen wrote:
> @@ -463,13 +462,21 @@ page_pool_dma_sync_for_device(const struct page_pool *pool,
> netmem_ref netmem,
> u32 dma_sync_size)
> {
> - if (pool->dma_sync && dma_dev_need_sync(pool->p.dev))
> - __page_pool_dma_sync_for_device(pool, netmem, dma_sync_size);
> + if (pool->dma_sync && dma_dev_need_sync(pool->p.dev)) {
Lacking a READ_ONCE() here, I think it's within compiler's right do some
unexpected optimization between this read and the next one. Also it will
make the double read more explicit.
Thanks,
Paolo
next prev parent reply other threads:[~2025-04-01 8:52 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-28 12:19 [PATCH net-next v5 0/2] Fix late DMA unmap crash for page pool Toke Høiland-Jørgensen
2025-03-28 12:19 ` [PATCH net-next v5 1/2] page_pool: Move pp_magic check into helper functions Toke Høiland-Jørgensen
2025-03-28 12:19 ` [PATCH net-next v5 2/2] page_pool: Track DMA-mapped pages and unmap them when destroying the pool Toke Høiland-Jørgensen
2025-03-31 16:35 ` Alexander Lobakin
2025-03-31 17:27 ` Zhu Yanjun
2025-04-01 9:24 ` Yunsheng Lin
2025-04-01 11:56 ` Alexander Lobakin
2025-04-02 11:15 ` Yunsheng Lin
2025-04-01 8:56 ` Paolo Abeni
2025-04-01 9:51 ` Pavel Begunkov
2025-04-01 12:06 ` Jesper Dangaard Brouer
2025-04-01 8:52 ` Paolo Abeni [this message]
2025-04-01 9:12 ` Toke Høiland-Jørgensen
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