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Tue, 7 Nov 2023 21:58:06 +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 08/86] Revert "arm64: Support PREEMPT_DYNAMIC" Date: Tue, 7 Nov 2023 13:56:54 -0800 Message-Id: <20231107215742.363031-9-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: MW4PR03CA0131.namprd03.prod.outlook.com (2603:10b6:303:8c::16) 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: 8616256d-8b7a-494b-72b7-08dbdfdc9f71 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Tue, 07 Nov 2023 14:01:34 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781944383181832241 X-GMAIL-MSGID: 1781944383181832241 This reverts commit 1b2d3451ee50a0968cb9933f726e50b368ba5073. Signed-off-by: Ankur Arora --- arch/arm64/Kconfig | 1 - arch/arm64/include/asm/preempt.h | 19 ++----------------- arch/arm64/kernel/entry-common.c | 10 +--------- 3 files changed, 3 insertions(+), 27 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 78f20e632712..856d7be2ee45 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -221,7 +221,6 @@ config ARM64 select HAVE_PERF_EVENTS_NMI if ARM64_PSEUDO_NMI select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP - select HAVE_PREEMPT_DYNAMIC_KEY select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_POSIX_CPU_TIMERS_TASK_WORK select HAVE_FUNCTION_ARG_ACCESS_API diff --git a/arch/arm64/include/asm/preempt.h b/arch/arm64/include/asm/preempt.h index 0159b625cc7f..e83f0982b99c 100644 --- a/arch/arm64/include/asm/preempt.h +++ b/arch/arm64/include/asm/preempt.h @@ -2,7 +2,6 @@ #ifndef __ASM_PREEMPT_H #define __ASM_PREEMPT_H -#include #include #define PREEMPT_NEED_RESCHED BIT(32) @@ -81,24 +80,10 @@ static inline bool should_resched(int preempt_offset) } #ifdef CONFIG_PREEMPTION - void preempt_schedule(void); +#define __preempt_schedule() preempt_schedule() void preempt_schedule_notrace(void); - -#ifdef CONFIG_PREEMPT_DYNAMIC - -DECLARE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched); -void dynamic_preempt_schedule(void); -#define __preempt_schedule() dynamic_preempt_schedule() -void dynamic_preempt_schedule_notrace(void); -#define __preempt_schedule_notrace() dynamic_preempt_schedule_notrace() - -#else /* CONFIG_PREEMPT_DYNAMIC */ - -#define __preempt_schedule() preempt_schedule() -#define __preempt_schedule_notrace() preempt_schedule_notrace() - -#endif /* CONFIG_PREEMPT_DYNAMIC */ +#define __preempt_schedule_notrace() preempt_schedule_notrace() #endif /* CONFIG_PREEMPTION */ #endif /* __ASM_PREEMPT_H */ diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index 0fc94207e69a..5d9c9951562b 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -225,17 +225,9 @@ static void noinstr arm64_exit_el1_dbg(struct pt_regs *regs) lockdep_hardirqs_on(CALLER_ADDR0); } -#ifdef CONFIG_PREEMPT_DYNAMIC -DEFINE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched); -#define need_irq_preemption() \ - (static_branch_unlikely(&sk_dynamic_irqentry_exit_cond_resched)) -#else -#define need_irq_preemption() (IS_ENABLED(CONFIG_PREEMPTION)) -#endif - static void __sched arm64_preempt_schedule_irq(void) { - if (!need_irq_preemption()) + if (!IS_ENABLED(CONFIG_PREEMPTION)) return; /*