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Tue, 7 Nov 2023 21:59:27 +0000 From: Ankur Arora To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, peterz@infradead.org, torvalds@linux-foundation.org, paulmck@kernel.org, linux-mm@kvack.org, x86@kernel.org, akpm@linux-foundation.org, luto@kernel.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, willy@infradead.org, mgorman@suse.de, jon.grimm@amd.com, bharata@amd.com, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com, jgross@suse.com, andrew.cooper3@citrix.com, mingo@kernel.org, bristot@kernel.org, mathieu.desnoyers@efficios.com, geert@linux-m68k.org, glaubitz@physik.fu-berlin.de, anton.ivanov@cambridgegreys.com, mattst88@gmail.com, krypton@ulrich-teichert.org, rostedt@goodmis.org, David.Laight@ACULAB.COM, richard@nod.at, mjguzik@gmail.com, Ankur Arora Subject: [RFC PATCH 34/86] thread_info: accessors for TIF_NEED_RESCHED* Date: Tue, 7 Nov 2023 13:57:20 -0800 Message-Id: <20231107215742.363031-35-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20231107215742.363031-1-ankur.a.arora@oracle.com> References: <20231107215742.363031-1-ankur.a.arora@oracle.com> X-ClientProxiedBy: MW2PR2101CA0008.namprd21.prod.outlook.com (2603:10b6:302:1::21) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|CY5PR10MB6141:EE_ X-MS-Office365-Filtering-Correlation-Id: 9ab5b2dc-a7ff-48fe-6a55-08dbdfdccfcf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Tue, 07 Nov 2023 14:16:10 -0800 (PST) X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781945210246175131 X-GMAIL-MSGID: 1781945210246175131 Add tif_resched() which will be used as an accessor for TIF_NEED_RESCHED and TIF_NEED_RESCHED_LAZY. The intent is to force the caller to make an explicit choice of how eagerly they want a reschedule. This interface will be used almost entirely from core kernel code, so forcing a choice shouldn't be too onerous. Originally-by: Thomas Gleixner Signed-off-by: Ankur Arora --- 1) Adding an enum for an interface that doesn't do all that much, seems to be overkill. This could have been an int/bool etc, but that seemed much less clear and thus more error prone. 2) Also there's no fallback path for architectures that don't define define TIF_NEED_RESCHD_LAZY. That's because arch support is easy to add (modulo ARCH_NO_PREEMPT, discussed in a different patch) so it will be simple to do that instead of thinking through what seemed like a slightly convoluted alternative model. --- include/linux/thread_info.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h index 9ea0b28068f4..4eb22b13bf64 100644 --- a/include/linux/thread_info.h +++ b/include/linux/thread_info.h @@ -59,6 +59,27 @@ enum syscall_work_bit { #include +#ifndef TIF_NEED_RESCHED_LAZY +#error "Arch needs to define TIF_NEED_RESCHED_LAZY" +#endif + +#define TIF_NEED_RESCHED_LAZY_OFFSET (TIF_NEED_RESCHED_LAZY - TIF_NEED_RESCHED) + +typedef enum { + RESCHED_eager = 0, + RESCHED_lazy = TIF_NEED_RESCHED_LAZY_OFFSET, +} resched_t; + +static inline int tif_resched(resched_t r) +{ + return TIF_NEED_RESCHED + r; +} + +static inline int _tif_resched(resched_t r) +{ + return 1 << tif_resched(r); +} + #ifdef __KERNEL__ #ifndef arch_set_restart_data