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Thu, 1 Sep 2022 23:18:52 +0000 From: Wilco Dijkstra To: Adhemerval Zanella Netto CC: 'GNU C Library' Subject: Re: [PATCH] elf: Use C11 like atomics on _dl_mcount Thread-Topic: [PATCH] elf: Use C11 like atomics on _dl_mcount Thread-Index: AQHYvfovPDBwefSqqEe296UxU2qQoq3KjBSAgAADjYOAACP7AIAADYq6 Date: Thu, 1 Sep 2022 23:18:52 +0000 Message-ID: References: <59b9367c-08f1-4f38-7273-b5eca48be60e@linaro.org> <5fd88725-8bef-2e26-420a-1216ebfa5cec@linaro.org> In-Reply-To: <5fd88725-8bef-2e26-420a-1216ebfa5cec@linaro.org> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; X-MS-Office365-Filtering-Correlation-Id: dc9f8df6-1a13-4ca5-6f58-08da8c70807b x-ms-traffictypediagnostic: AS8PR08MB6597:EE_|VE1EUR03FT038:EE_|DU0PR08MB8445:EE_ x-checkrecipientrouted: true nodisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Sep 2022 23:20:04.4582 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dc9f8df6-1a13-4ca5-6f58-08da8c70807b X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: VE1EUR03FT038.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR08MB8445 X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,FORGED_SPF_HELO,KAM_DMARC_NONE,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: Hi Adhemerval,=0A= =0A= > Is the https://patchwork.sourceware.org/project/glibc/list/?series=3D1072= 7 right? I =0A= > think it has failed CI, could you submit again?=0A= =0A= I'll rebase it. I'll probably move the files that cause all the conflicts i= nto a different=0A= patch (an alternative would be to increase the vertical spacing between all= the=0A= defines first so that merge tools no longer get confused).=0A= =0A= > I thinking we are tracking two different issues, although they are correl= ated.=0A= > My take is to first try to map the current code to a C11-like atomic, so = we=0A= > can always use compiler builtins where applicable (there are couple of = =0A= > architecture that we might avoid using libgcc for performance reasons), a= nd=0A= > then check if the atomic usage does make sense.=0A= =0A= Yes, so I first mapped them to an atomic with the most appropriate MO (sinc= e=0A= the MO of many existing macros is not well defined). We should look at=0A= correctness in a second pass since it is already clear there are many concu= rrency=0A= bugs.=0A= =0A= Cheers,=0A= Wilco=