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Message-ID: <20251020084852.1a26a330@kernel.org>
Date: Mon, 20 Oct 2025 08:48:52 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Jiawen Wu <jiawenwu@...stnetic.com>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew+netdev@...n.ch>, "David S.
Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo
Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>, Mengyuan Lou
<mengyuanlou@...-swift.com>
Subject: Re: [PATCH net-next 2/3] net: txgbe: support TX head write-back
mode
On Mon, 20 Oct 2025 16:26:08 +0800 Jiawen Wu wrote:
> + tx_ring->headwb_mem = dma_alloc_coherent(tx_ring->dev,
> + sizeof(u32),
> + &tx_ring->headwb_dma,
> + GFP_KERNEL);
> + if (!tx_ring->headwb_mem) {
> + dev_info(tx_ring->dev, "Allocate headwb memory failed, disable it\n");
> + return;
> + }
> +
> + memset(tx_ring->headwb_mem, 0, sizeof(u32));
drivers/net/ethernet/wangxun/libwx/wx_lib.c:2932:23-41: WARNING: dma_alloc_coherent used in tx_ring -> headwb_mem already zeroes out memory, so memset is not needed
--
pw-bot: cr
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