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Tue, 7 Nov 2023 21:57:46 +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 01/86] Revert "riscv: support PREEMPT_DYNAMIC with static keys" Date: Tue, 7 Nov 2023 13:56:47 -0800 Message-Id: <20231107215742.363031-2-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: BY3PR05CA0044.namprd05.prod.outlook.com (2603:10b6:a03:39b::19) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|CYYPR10MB7651:EE_ X-MS-Office365-Filtering-Correlation-Id: 072ae498-3762-4139-efc1-08dbdfdc935c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Tue, 07 Nov 2023 14:01:04 -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: 1781944293522126009 X-GMAIL-MSGID: 1781944293522126009 As a consequence of making the scheduler responsible for driving voluntary preemption, we can do away with explicit preemption points. This means that most of the CONFIG_PREEMPT_DYNAMIC logic, which uses static calls to switch between varieties of preemption points, can be removed. This reverts commit 4e90d0522a688371402ced1d1958ee7381b81f05. Signed-off-by: Ankur Arora --- arch/riscv/Kconfig | 1 - include/asm-generic/preempt.h | 14 +------------- 2 files changed, 1 insertion(+), 14 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 9c48fecc6719..4003436e6dad 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -134,7 +134,6 @@ config RISCV select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_POSIX_CPU_TIMERS_TASK_WORK - select HAVE_PREEMPT_DYNAMIC_KEY if !XIP_KERNEL select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RETHOOK if !XIP_KERNEL select HAVE_RSEQ diff --git a/include/asm-generic/preempt.h b/include/asm-generic/preempt.h index 51f8f3881523..b4d43a4af5f7 100644 --- a/include/asm-generic/preempt.h +++ b/include/asm-generic/preempt.h @@ -80,21 +80,9 @@ static __always_inline bool should_resched(int preempt_offset) #ifdef CONFIG_PREEMPTION extern asmlinkage void preempt_schedule(void); -extern asmlinkage void preempt_schedule_notrace(void); - -#if defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY) - -void dynamic_preempt_schedule(void); -void dynamic_preempt_schedule_notrace(void); -#define __preempt_schedule() dynamic_preempt_schedule() -#define __preempt_schedule_notrace() dynamic_preempt_schedule_notrace() - -#else /* !CONFIG_PREEMPT_DYNAMIC || !CONFIG_HAVE_PREEMPT_DYNAMIC_KEY*/ - #define __preempt_schedule() preempt_schedule() +extern asmlinkage void preempt_schedule_notrace(void); #define __preempt_schedule_notrace() preempt_schedule_notrace() - -#endif /* CONFIG_PREEMPT_DYNAMIC && CONFIG_HAVE_PREEMPT_DYNAMIC_KEY*/ #endif /* CONFIG_PREEMPTION */ #endif /* __ASM_PREEMPT_H */