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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SA2PEPF000015C8.mail.protection.outlook.com (10.167.241.198) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7292.25 via Frontend Transport; Tue, 20 Feb 2024 17:20:23 +0000 Received: from BLR5CG134614W.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 20 Feb 2024 11:20:18 -0600 From: K Prateek Nayak To: CC: "Gautham R. 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Wysocki" , Daniel Lezcano , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , "Valentin Schneider" , , Subject: [RFC PATCH 11/14] csky/thread_info: Introduce TIF_NOTIFY_IPI flag Date: Tue, 20 Feb 2024 22:44:54 +0530 Message-ID: <20240220171457.703-12-kprateek.nayak@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240220171457.703-1-kprateek.nayak@amd.com> References: <20240220171457.703-1-kprateek.nayak@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015C8:EE_|MN0PR12MB6053:EE_ X-MS-Office365-Filtering-Correlation-Id: 95e0b977-c205-427e-83c7-08dc32383926 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(36860700004)(40470700004)(46966006);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2024 17:20:23.7681 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 95e0b977-c205-427e-83c7-08dc32383926 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015C8.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6053 Add support for TIF_NOTIFY_IPI on C-SKY. With TIF_NOTIFY_IPI, a sender sending an IPI to an idle CPU in TIF_POLLING mode will set the TIF_NOTIFY_IPI flag in the target's idle tasks's thread_info to pull the CPU out of idle, as opposed to setting TIF_NEED_RESCHED previously. This avoids spurious calls to schedule_idle() in cases where an IPI does not necessarily wake up a task on the idle CPU. Cc: Guo Ren Cc: "Rafael J. Wysocki" Cc: Daniel Lezcano Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Juri Lelli Cc: Vincent Guittot Cc: Dietmar Eggemann Cc: Steven Rostedt Cc: Ben Segall Cc: Mel Gorman Cc: Daniel Bristot de Oliveira Cc: Valentin Schneider Cc: K Prateek Nayak Cc: linux-csky@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Signed-off-by: K Prateek Nayak --- arch/csky/include/asm/thread_info.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h index b5ed788f0c68..9bc7a037c476 100644 --- a/arch/csky/include/asm/thread_info.h +++ b/arch/csky/include/asm/thread_info.h @@ -61,6 +61,7 @@ static inline struct thread_info *current_thread_info(void) #define TIF_SYSCALL_TRACEPOINT 5 /* syscall tracepoint instrumentation */ #define TIF_SYSCALL_AUDIT 6 /* syscall auditing */ #define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ +#define TIF_NOTIFY_IPI 8 /* Pending IPI on TIF_POLLLING idle CPU */ #define TIF_POLLING_NRFLAG 16 /* poll_idle() is TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ #define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */ @@ -73,6 +74,7 @@ static inline struct thread_info *current_thread_info(void) #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) +#define _TIF_NOTIFY_IPI (1 << TIF_NOTIFY_IPI) #define _TIF_UPROBE (1 << TIF_UPROBE) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_MEMDIE (1 << TIF_MEMDIE) -- 2.34.1