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Thu, 22 Apr 2021 08:16:52 +0000 Received: from [10.26.49.10] (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 22 Apr 2021 08:16:45 +0000 Subject: Re: [PATCH v4 05/10] signal: Introduce TRAP_PERF si_code and si_perf to siginfo To: Marco Elver , Marek Szyprowski CC: Peter Zijlstra , Alexander Shishkin , Arnaldo Carvalho de Melo , Ingo Molnar , Jiri Olsa , Mark Rutland , Namhyung Kim , Thomas Gleixner , Alexander Potapenko , Al Viro , Arnd Bergmann , Christian Brauner , Dmitry Vyukov , Jann Horn , Jens Axboe , Matt Morehouse , Peter Collingbourne , Ian Rogers , Oleg Nesterov , kasan-dev , linux-arch , linux-fsdevel , LKML , the arch/x86 maintainers , "open list:KERNEL SELFTEST FRAMEWORK" , Geert Uytterhoeven , Bartlomiej Zolnierkiewicz , Linux ARM , References: <43f8a3bf-34c5-0fc9-c335-7f92eaf23022@samsung.com> <740077ce-efe1-b171-f807-bc5fd95a32ba@samsung.com> From: Jon Hunter Message-ID: Date: Thu, 22 Apr 2021 09:16:43 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [172.20.145.6] X-ClientProxiedBy: HQMAIL111.nvidia.com (172.20.187.18) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 46b2d5bf-fba0-49a2-bcdb-08d90566fc25 X-MS-TrafficTypeDiagnostic: MN2PR12MB3758: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:10000; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: nm5s+WgV7SQ8bBFfG1OlcKc4uJ8eghCmgsLVl90qOnH7vUoHUilS0KzakTQwzcepwt5ugpt55utCYrfBj/1Y8caAsOpqtF69hgQuFqbtkvXXOoya/gjp0VR9Fo72P5iNhXMqxGRTxi1vMLXtzxHYHkEe1oYToKMVExl8kCZAS/efyxYO4RqumzkN63dp6N6q/3Nnc2eE2VpdOylZJBnrDiJLIfNi6R30GodaE/UWY+yj5X9BT3Cv2slDjMSwsmlHZzcbR5nQ7ho6/Kn80NllfSBWVDBHRoCzj288AvgQ4gYaguKF+ZLmNnCHH9a++5d8vW892rLv6M3lLCcgQW/Vyas7DEUncHc6sn80YYBmOptNvwE3cGVDiz1aOxlW4LIif6T7WAs0gVO0cdawLjcuoHoyRXYyKQi+/BZ8CnCbwnO0P9VTHIP5ho9Wse+2lZWZRHEo38NOS+ImQI2Lzvk8fucnoYyypZbvGDXXEGtyIxkIIxTfqhC6TUveqoAs56j3HJ6m6sX+p1i3i1Rq9eCNKoLnanjUOiI3kZYQnU+sJnaiV790TwJy9J32EWuEi1reqf6a75CIfZjGHyTLx6qG8OeTCPCwpP0c/DCbqckI8BiIg6eueATDXyqg9ZNiL0B9k5qFe4SIhmZVFM27OV2a+JRGqiCqxNZHKYRIldNIXqgwf/kwdmwB7o5iHPYbp82L/VcQRak5K6V9BjLh/WrokNpemkKLx6wZgu/V0DHHTNbRd4UNxygJytVEFq98zeiFd9J+ns7urgpbOaX7dOyhEg== X-Forefront-Antispam-Report: CIP:216.228.112.34;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:schybrid03.nvidia.com;CAT:NONE;SFS:(4636009)(39860400002)(376002)(136003)(396003)(346002)(46966006)(36840700001)(5660300002)(86362001)(31686004)(7406005)(36906005)(7416002)(316002)(82310400003)(7636003)(82740400003)(83380400001)(31696002)(70586007)(70206006)(356005)(186003)(426003)(36756003)(8676002)(4326008)(47076005)(16526019)(966005)(36860700001)(53546011)(110136005)(478600001)(2906002)(54906003)(16576012)(2616005)(8936002)(26005)(336012)(43740500002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Apr 2021 08:16:52.3701 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 46b2d5bf-fba0-49a2-bcdb-08d90566fc25 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT066.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB3758 Precedence: bulk List-ID: X-Mailing-List: linux-tegra@vger.kernel.org On 22/04/2021 07:47, Marco Elver wrote: > On Thu, 22 Apr 2021 at 08:12, Marek Szyprowski wrote: > [...] >>> So I think we just have to settle on 'unsigned long' here. On many >>> architectures, like 32-bit Arm, the alignment of a structure is that of >>> its largest member. This means that there is no portable way to add >>> 64-bit integers to siginfo_t on 32-bit architectures. >>> >>> In the case of the si_perf field, word size is sufficient since the data >>> it contains is user-defined. On 32-bit architectures, any excess bits of >>> perf_event_attr::sig_data will therefore be truncated when copying into >>> si_perf. >>> >>> Feel free to test the below if you have time, but the below lets me boot >>> 32-bit arm which previously timed out. It also passes all the >>> static_asserts() I added (will send those as separate patches). >>> >>> Once I'm convinced this passes all others tests too, I'll send a patch. >> >> This fixes the issue I've observed on my test systems. Feel free to add: >> >> Reported-by: Marek Szyprowski >> >> Tested-by: Marek Szyprowski > > Thank you for testing! It's been sent: > https://lkml.kernel.org/r/20210422064437.3577327-1-elver@google.com Thanks! This fixes the problem for Tegra as well. I have responded to the above patch with my tested-by. 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Thu, 22 Apr 2021 08:16:52 +0000 Received: from [10.26.49.10] (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 22 Apr 2021 08:16:45 +0000 Subject: Re: [PATCH v4 05/10] signal: Introduce TRAP_PERF si_code and si_perf to siginfo To: Marco Elver , Marek Szyprowski CC: Peter Zijlstra , Alexander Shishkin , Arnaldo Carvalho de Melo , Ingo Molnar , Jiri Olsa , Mark Rutland , Namhyung Kim , Thomas Gleixner , Alexander Potapenko , Al Viro , Arnd Bergmann , Christian Brauner , Dmitry Vyukov , Jann Horn , Jens Axboe , Matt Morehouse , Peter Collingbourne , Ian Rogers , Oleg Nesterov , kasan-dev , linux-arch , linux-fsdevel , LKML , the arch/x86 maintainers , "open list:KERNEL SELFTEST FRAMEWORK" , Geert Uytterhoeven , Bartlomiej Zolnierkiewicz , Linux ARM , References: <43f8a3bf-34c5-0fc9-c335-7f92eaf23022@samsung.com> <740077ce-efe1-b171-f807-bc5fd95a32ba@samsung.com> From: Jon Hunter Message-ID: Date: Thu, 22 Apr 2021 09:16:43 +0100 User-Agent: Mozilla/5.0 (X11; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 22/04/2021 07:47, Marco Elver wrote: > On Thu, 22 Apr 2021 at 08:12, Marek Szyprowski wrote: > [...] >>> So I think we just have to settle on 'unsigned long' here. On many >>> architectures, like 32-bit Arm, the alignment of a structure is that of >>> its largest member. This means that there is no portable way to add >>> 64-bit integers to siginfo_t on 32-bit architectures. >>> >>> In the case of the si_perf field, word size is sufficient since the data >>> it contains is user-defined. On 32-bit architectures, any excess bits of >>> perf_event_attr::sig_data will therefore be truncated when copying into >>> si_perf. >>> >>> Feel free to test the below if you have time, but the below lets me boot >>> 32-bit arm which previously timed out. It also passes all the >>> static_asserts() I added (will send those as separate patches). >>> >>> Once I'm convinced this passes all others tests too, I'll send a patch. >> >> This fixes the issue I've observed on my test systems. Feel free to add: >> >> Reported-by: Marek Szyprowski >> >> Tested-by: Marek Szyprowski > > Thank you for testing! It's been sent: > https://lkml.kernel.org/r/20210422064437.3577327-1-elver@google.com Thanks! This fixes the problem for Tegra as well. I have responded to the above patch with my tested-by. Cheers Jon -- nvpublic _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel