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Mon, 1 Mar 2021 16:25:38 -0800 Envelope-to: maxz@xilinx.com, max.zhen@xilinx.com, michal.simek@xilinx.com, sonal.santan@xilinx.com, lizhi.hou@xilinx.com, stefanos@xilinx.com, robh@kernel.org, mdf@kernel.org, devicetree@vger.kernel.org, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org, trix@redhat.com Received: from [10.17.2.60] (port=48288) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1lGsr3-0000MW-Th; Mon, 01 Mar 2021 16:25:37 -0800 Subject: Re: [PATCH V3 XRT Alveo 03/18] fpga: xrt: xclbin file helper functions To: Tom Rix , Lizhi Hou , CC: , , , , , , , , Max Zhen References: <20210218064019.29189-1-lizhih@xilinx.com> <20210218064019.29189-4-lizhih@xilinx.com> <4628ef05-27d1-b92f-9126-27a1f810c608@redhat.com> <3b73400c-cca1-60af-4eea-ed85de77a977@xilinx.com> From: Lizhi Hou Message-ID: <55ed0169-085c-9706-3b17-23ea582c43c3@xilinx.com> Date: Mon, 1 Mar 2021 16:25:37 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; 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X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Mar 2021 00:25:40.2466 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1adb70d0-c6e2-4dae-cfe1-08d8dd11b594 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: CY1NAM02FT055.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PR02MB5059 Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org Hi Tom， On 02/28/2021 08:54 AM, Tom Rix wrote: > CAUTION: This message has originated from an External Source. Please use proper judgment and caution when opening attachments, clicking links, or responding to this email. > > > On 2/26/21 1:23 PM, Lizhi Hou wrote: >> Hi Tom, >> >> > snip > >>> I also do not see a pragma pack, usually this is set of 1 so the compiler does not shuffle elements, increase size etc. >> This data structure is shared with other tools. And the structure is well defined with reasonable alignment. It is compatible with all compilers we have tested. So pragma pack is not necessary. > You can not have possibly tested all the configurations since the kernel supports many arches and compilers. > > If the tested existing alignment is ok, pragma pack should be a noop on your tested configurations. > > And help cover the untested configurations. Got it. I will add pragma pack(1). Lizhi > > Tom >