From: Jakub Kicinski <kuba@kernel.org>
To: "Toke Høiland-Jørgensen" <toke@redhat.com>
Cc: "David S. Miller" <davem@davemloft.net>,
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>,
Paolo Abeni <pabeni@redhat.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>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-rdma@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH net-next v2 2/3] page_pool: Turn dma_sync and dma_sync_cpu fields into a bitmap
Date: Wed, 26 Mar 2025 04:23:47 -0700 [thread overview]
Message-ID: <20250326042347.279f23a8@kernel.org> (raw)
In-Reply-To: <87cye4qkgd.fsf@toke.dk>
On Wed, 26 Mar 2025 09:12:34 +0100 Toke Høiland-Jørgensen wrote:
> > I don't see why we'd need to wipe them atomically.
> > In fact I don't see why we're touching dma_sync_cpu, at all,
> > it's driver-facing and the driver is gone in the problematic
> > scenario.
>
> No you're right, but it felt weird to change just one of them, so
> figured I'd go with both. But keeping them both as bool, and just making
> dma_sync a full-width bool works, so I'll respin with that and leave
> dma_sync_cpu as-is.
Opinion on dma_sync_cpu clearing probably depends on mental model.
No strong feelings but perhaps add a comment next to clearing it
for the likes of myself saying that this technically shouldn't be
needed as we only expect drivers to ask for CPU sync?
next prev parent reply other threads:[~2025-03-26 11:23 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-25 15:45 [PATCH net-next v2 0/3] Fix late DMA unmap crash for page pool Toke Høiland-Jørgensen
2025-03-25 15:45 ` [PATCH net-next v2 1/3] page_pool: Move pp_magic check into helper functions Toke Høiland-Jørgensen
2025-03-25 15:45 ` [PATCH net-next v2 2/3] page_pool: Turn dma_sync and dma_sync_cpu fields into a bitmap Toke Høiland-Jørgensen
2025-03-25 22:17 ` Jakub Kicinski
2025-03-26 8:12 ` Toke Høiland-Jørgensen
2025-03-26 11:23 ` Jakub Kicinski [this message]
2025-03-26 11:29 ` Jakub Kicinski
2025-03-26 18:00 ` Saeed Mahameed
2025-03-25 15:45 ` [PATCH net-next v2 3/3] page_pool: Track DMA-mapped pages and unmap them when destroying the pool Toke Høiland-Jørgensen
2025-03-26 13:54 ` Jesper Dangaard Brouer
2025-03-26 18:22 ` Saeed Mahameed
2025-03-26 20:02 ` Mina Almasry
2025-03-27 0:29 ` Saeed Mahameed
2025-03-27 1:37 ` Mina Almasry
2025-03-27 3:53 ` Yunsheng Lin
2025-03-27 4:59 ` Mina Almasry
2025-03-27 7:21 ` Yunsheng Lin
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