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Thu, 9 Apr 2020 15:27:53 +0000 Received: from BYAPR18MB2535.namprd18.prod.outlook.com ([fe80::65f8:9bfe:5fa5:1280]) by BYAPR18MB2535.namprd18.prod.outlook.com ([fe80::65f8:9bfe:5fa5:1280%3]) with mapi id 15.20.2878.022; Thu, 9 Apr 2020 15:27:53 +0000 From: Alex Belits To: "frederic@kernel.org" , "rostedt@goodmis.org" CC: Prasun Kapoor , "mingo@kernel.org" , "davem@davemloft.net" , "linux-api@vger.kernel.org" , "peterz@infradead.org" , "linux-arch@vger.kernel.org" , "catalin.marinas@arm.com" , "tglx@linutronix.de" , "will@kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "netdev@vger.kernel.org" Subject: [PATCH v3 12/13] task_isolation: kick_all_cpus_sync: don't kick isolated cpus Thread-Topic: [PATCH v3 12/13] task_isolation: kick_all_cpus_sync: don't kick isolated cpus Thread-Index: AQHWDoNvCsQmG23IQESmsNGJJIL4Cw== Date: Thu, 9 Apr 2020 15:27:53 +0000 Message-ID: <9da10e7fdfae23fe397852d40101e8db1f1faf07.camel@marvell.com> References: <4473787e1b6bc3cc226067e8d122092a678b63de.camel@marvell.com> <07c25c246c55012981ec0296eee23e68c719333a.camel@marvell.com> In-Reply-To: <07c25c246c55012981ec0296eee23e68c719333a.camel@marvell.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [173.228.7.197] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: a9af5b79-3b4b-40a8-af64-08d7dc9a922b x-ms-traffictypediagnostic: BYAPR18MB2423: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:873; x-forefront-prvs: 0368E78B5B x-forefront-antispam-report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:BYAPR18MB2535.namprd18.prod.outlook.com; PTR:; CAT:NONE; SFTY:; SFS:(10009020)(4636009)(366004)(376002)(39860400002)(346002)(396003)(136003)(86362001)(26005)(186003)(5660300002)(316002)(2616005)(81166007)(36756003)(7416002)(71200400001)(2906002)(76116006)(4744005)(6486002)(478600001)(6506007)(6512007)(66556008)(64756008)(66446008)(8676002)(81156014)(66476007)(8936002)(66946007)(54906003)(4326008)(110136005); DIR:OUT; SFP:1101; received-spf: None (protection.outlook.com: marvell.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: X0fWa2SO1Qha7T7vwCLR4dH2fXuFyrKohGypdpJkuv+QQCcrIjSLLVgvA8jc4xti9/3tRMBzlfp5ZZMYYtoHcqlbRtXtY2JSHPsnydWr90FYmYNuNCvEfyc+sXC6v7zceihtlanclqUzdpYbxaYPypUeQ0nLIIA2mdAeYqLs4hfEGC9glPRyXGDz9k6P3Oi7wHVfRxSGOm6q1P45FPWTyPTScpwC/XkI1/UgIvOE5Nx68GS5Xhi89ezSr4deulxw7NR55BPK7yfkw8lHmResMc2C6DefBwVP4LYyxcD0kFGtMFfyorU74WelG8zmT0rE0XcOCb5DhreRci1hKjnpqqb6S9f3HFWC7M9xkBTeYcS6khT8CUX2EjUdzJu3qVkViC1a1h2jxeTzzDZEuPnydjc09tPaxkPJSwngF/xrLRiIahYDoPd5vAj4um0xWoAr x-ms-exchange-antispam-messagedata: 1rE04AYJ2QJSYPKCzQRgsgGLW70JO8CIf+MJYE14EOUcc6OsPWn7OD8kyafU3DQ1qAPDJnjnmRYLOFtVom2GMgHGyebSP5/bOEDh/mLetBmAJgV6Mruxztp1MOSDoO0CznPzWivj5yI8PWMZHmkvrw== Content-ID: <9171AFCABF030842829F8BF831A406F6@namprd18.prod.outlook.com> MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: a9af5b79-3b4b-40a8-af64-08d7dc9a922b X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Apr 2020 15:27:53.0066 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 70e1fb47-1155-421d-87fc-2e58f638b6e0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 9lK+jAPSqguK6cbxa0k9DgkDYaThVJwmwIQVbBI9GHN+PBh+ZsG4l0Q5WMbzVIHd1mePJbx6q+bHV+VWCOA02Q== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR18MB2423 X-OriginatorOrg: marvell.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.676 definitions=2020-04-09_05:2020-04-07,2020-04-09 signatures=0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Yuri Norov Make sure that kick_all_cpus_sync() does not call CPUs that are running isolated tasks. Signed-off-by: Yuri Norov [abelits@marvell.com: use safe task_isolation_cpumask() implementation] Signed-off-by: Alex Belits --- kernel/smp.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/kernel/smp.c b/kernel/smp.c index 3a8bcbdd4ce6..d9b4b2fedfed 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -731,9 +731,21 @@ static void do_nothing(void *unused) */ void kick_all_cpus_sync(void) { + struct cpumask mask; + /* Make sure the change is visible before we kick the cpus */ smp_mb(); - smp_call_function(do_nothing, NULL, 1); + + preempt_disable(); +#ifdef CONFIG_TASK_ISOLATION + cpumask_clear(&mask); + task_isolation_cpumask(&mask); + cpumask_complement(&mask, &mask); +#else + cpumask_setall(&mask); +#endif + smp_call_function_many(&mask, do_nothing, NULL, 1); + preempt_enable(); } EXPORT_SYMBOL_GPL(kick_all_cpus_sync);