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Thu, 15 Jan 2026 19:44:16 +0000 Received: from AS8PR04MB8948.eurprd04.prod.outlook.com ([fe80::843f:752e:60d:3e5e]) by AS8PR04MB8948.eurprd04.prod.outlook.com ([fe80::843f:752e:60d:3e5e%4]) with mapi id 15.20.9499.002; Thu, 15 Jan 2026 19:44:15 +0000 Date: Thu, 15 Jan 2026 14:44:00 -0500 From: Frank Li To: Niklas Cassel Cc: Koichiro Den , jingoohan1@gmail.com, mani@kernel.org, lpieralisi@kernel.org, kwilczynski@kernel.org, robh@kernel.org, bhelgaas@google.com, vigneshr@ti.com, s-vadapalli@ti.com, hongxing.zhu@nxp.com, l.stach@pengutronix.de, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, minghuan.Lian@nxp.com, mingkai.hu@nxp.com, roy.zang@nxp.com, jesper.nilsson@axis.com, heiko@sntech.de, srikanth.thokala@intel.com, marek.vasut+renesas@gmail.com, yoshihiro.shimoda.uh@renesas.com, geert+renesas@glider.be, magnus.damm@gmail.com, christian.bruel@foss.st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, thierry.reding@gmail.com, jonathanh@nvidia.com, hayashi.kunihiko@socionext.com, mhiramat@kernel.org, kishon@kernel.org, jirislaby@kernel.org, rongqianfeng@vivo.com, 18255117159@163.com, shawn.lin@rock-chips.com, nicolas.frattaroli@collabora.com, linux.amoon@gmail.com, vidyas@nvidia.com, linux-omap@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@axis.com, linux-rockchip@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-tegra@vger.kernel.org Subject: Re: [PATCH v8 2/5] PCI: endpoint: Add BAR subrange mapping support Message-ID: References: <20260115084928.55701-1-den@valinux.co.jp> <20260115084928.55701-3-den@valinux.co.jp> Content-Type: text/plain; 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> > > enum pci_barno barno; > > > int flags; > > > + > > > + /* Optional sub-range mapping */ > > > + unsigned int num_submap; > > > + struct pci_epf_bar_submap *submap; > > > > struct pci_epf_bar_submap submap[] __counted_by(num_submap); > > > > Not sure if use this simplify alloc/free. > > Your suggestion changes the submap from a pointer to a flexible array > member. > > A flexible array member must always be last in the struct, > and you can only have one flexible array member per struct. > > Additionally, using a flexible array member requires the struct to > always be allocated on the heap. You can't allocate a struct with a > flexible array member on the stack. > > So I'm not sure that if your suggestion is something we want. Yes, forget my comments if not fit. Frank > > > Kind regards, > Niklas