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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 SA2PEPF000015C6.mail.protection.outlook.com (10.167.241.196) 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 17:19:41 +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 11:19:34 -0600 From: K Prateek Nayak To: CC: "Gautham R. Shenoy" , K Prateek Nayak , Yoshinori Sato , "Rich Felker" , John Paul Adrian Glaubitz , "Rafael J. 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 , Andrew Morton , Arnd Bergmann , , Subject: [RFC PATCH 09/14] sh/thread_info: Introduce TIF_NOTIFY_IPI flag Date: Tue, 20 Feb 2024 22:44:52 +0530 Message-ID: <20240220171457.703-10-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-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: SA2PEPF000015C6:EE_|PH0PR12MB7958:EE_ X-MS-Office365-Filtering-Correlation-Id: de553326-5489-4601-27d7-08dc32382036 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 17:19:41.9120 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: de553326-5489-4601-27d7-08dc32382036 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: SA2PEPF000015C6.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB7958 Add support for TIF_NOTIFY_IPI on SuperH. 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: Yoshinori Sato Cc: Rich Felker Cc: John Paul Adrian Glaubitz 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: Andrew Morton Cc: K Prateek Nayak Cc: Arnd Bergmann Cc: linux-sh@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Signed-off-by: K Prateek Nayak --- arch/sh/include/asm/thread_info.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h index 9f19a682d315..8cd9d2a5361b 100644 --- a/arch/sh/include/asm/thread_info.h +++ b/arch/sh/include/asm/thread_info.h @@ -106,6 +106,7 @@ extern void init_thread_xstate(void); #define TIF_SECCOMP 6 /* secure computing */ #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ +#define TIF_NOTIFY_IPI 9 /* Pending IPI on TIF_POLLLING idle CPU */ #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ @@ -118,6 +119,7 @@ extern void init_thread_xstate(void); #define _TIF_SECCOMP (1 << TIF_SECCOMP) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) +#define _TIF_NOTIFY_IPI (1 << TIF_NOTIFY_IPI) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) /* work to do in syscall trace */