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Mon, 09 Mar 2026 04:08:22 -0700 (PDT) Received: from oss.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-829a48dfc17sm11868886b3a.64.2026.03.09.04.08.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Mar 2026 04:08:22 -0700 (PDT) Date: Mon, 9 Mar 2026 16:38:12 +0530 From: Mohd Ayaan Anwar To: "Russell King (Oracle)" Cc: Andrew Lunn , Alexandre Torgue , Andrew Lunn , AngeloGioacchino Del Regno , Chen-Yu Tsai , "David S. Miller" , Eric Dumazet , Frank Li , imx@lists.linux.dev, Jakub Kicinski , Jan Petrous , Jonathan Hunter , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, Maxime Chevallier , netdev@vger.kernel.org, Paolo Abeni , Pengutronix Kernel Team , s32@nxp.com, Samuel Holland , Sascha Hauer , Yao Zi Subject: Re: [PATCH net-next v2 1/7] net: stmmac: provide plat_dat->dma_cfg in stmmac_plat_dat_alloc() Message-ID: References: Precedence: bulk X-Mailing-List: imx@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Proofpoint-ORIG-GUID: RmKtiRHdCgmRdwiHoVJz7i3M_-uT1NAW X-Proofpoint-GUID: RmKtiRHdCgmRdwiHoVJz7i3M_-uT1NAW X-Authority-Analysis: v=2.4 cv=OOQqHCaB c=1 sm=1 tr=0 ts=69aeaa28 cx=c_pps a=oF/VQ+ItUULfLr/lQ2/icg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=kj9zAlcOel0A:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=gowsoOTTUOVcmtlkKump:22 a=PHq6YzTAAAAA:8 a=EUspDBNiAAAA:8 a=EL_Z8gHO3nUhwFgt7b4A:9 a=CjuIK1q_8ugA:10 a=zZCYzV9kfG8A:10 a=3WC7DwWrALyhR5TkjVHa:22 a=ZKzU8r6zoKMcqsNulkmm:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzA5MDEwMiBTYWx0ZWRfX+d8U6o8shSzz ftVLq0uGXxQx+jCGM4nIVqu+xR1Yo+wVTJ+lBnXKlS/BQKnqvnte1TmMDluJ5jjR0rRpCgIOQ5X UN8V3G4LRsc+1uuh74llvhiTK2UNzAdw0cDrxrWhr/9dKUb15MaxgB7qXtna20lQKXLvFyvU/eK 4gbc6HE4YTZ4CQLtnCPERtqKh7n5j40CYmm9ierLy9eIxi2FYB/8N8ByDYt5iMo3vdxp0pDeBmk c204FUainKJRAf/cdFtOyAxaArB9tQQmb26FYC24LCLElV4h1FArhRozvc7zsbie2i465s+S99x p82Th6ODaaCxCWHd5DsF8/WwNePvmjWPUkBMcL6k3ZFOEdizThknf0CXIMMn151d5pabjWfQKm+ 6jsnVQqnXJzeSBpnMqFO6czo3SCWeJRnHmWsruXaj0GTv9GP0NOgP32Mfb9LCkw5N4a+tJuQMQ+ xqwEeBR1DCIx1ru1Yqw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-09_03,2026-03-06_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 impostorscore=0 suspectscore=0 spamscore=0 malwarescore=0 bulkscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603090102 On Mon, Mar 09, 2026 at 09:39:18AM +0000, Russell King (Oracle) wrote: > plat_dat->dma_cfg is unconditionally required for the operation of the > driver, so it would make sense to allocate it along with the plat_dat. > > On Arm64, sizeof(*plat_dat) has recently shrunk from 880 to 816 bytes > and sizeof(*plat_dat->dma_cfg) has shrunk from 32 to 20 bytes. > > Given that dma_cfg is required, and it is now less than a cache line, > It doesn't make sense to allocate this separateny, so place it at the > end of struct plat_stmmacenet_data, and set plat_dat->dma_cfg to point > at that to avoid mass changes. > > Signed-off-by: Russell King (Oracle) > --- Reviewed-by: Mohd Ayaan Anwar Ayaan