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Thu, 9 Apr 2020 15:27:53 +0000 From: Alex Belits To: "frederic@kernel.org" , "rostedt@goodmis.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; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.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); -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel