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Tue, 7 Nov 2023 22:00:20 +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 51/86] preempt: disallow !PREEMPT_COUNT or !PREEMPTION Date: Tue, 7 Nov 2023 13:57:37 -0800 Message-Id: <20231107215742.363031-52-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: MW4PR04CA0236.namprd04.prod.outlook.com (2603:10b6:303:87::31) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|PH7PR10MB6275:EE_ X-MS-Office365-Filtering-Correlation-Id: 6dfa16ba-43e8-48a9-78aa-08dbdfdceef9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Tue, 07 Nov 2023 14:06:56 -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: 1781944642904188795 X-GMAIL-MSGID: 1781944642904188795 PREEMPT_COUNT and PREEMPTION are selected for all preemption models. Mark configurations which might not have either as invalid. Also stub cond_resched() since we don't actually need it for anything. Signed-off-by: Ankur Arora --- include/linux/kernel.h | 11 ++--------- include/linux/preempt.h | 42 +++-------------------------------------- include/linux/sched.h | 4 +--- 3 files changed, 6 insertions(+), 51 deletions(-) diff --git a/include/linux/kernel.h b/include/linux/kernel.h index cf077cd69643..a48900d8b409 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h @@ -95,13 +95,6 @@ struct completion; struct user; -#ifdef CONFIG_PREEMPT_VOLUNTARY -extern int _cond_resched(void); -# define might_resched() _cond_resched() -#else -# define might_resched() do { } while (0) -#endif - #ifdef CONFIG_DEBUG_ATOMIC_SLEEP extern void __might_resched(const char *file, int line, unsigned int offsets); extern void __might_sleep(const char *file, int line); @@ -121,7 +114,7 @@ extern void __cant_migrate(const char *file, int line); * supposed to. */ # define might_sleep() \ - do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0) + do { __might_sleep(__FILE__, __LINE__); } while (0) /** * cant_sleep - annotation for functions that cannot sleep * @@ -163,7 +156,7 @@ extern void __cant_migrate(const char *file, int line); static inline void __might_resched(const char *file, int line, unsigned int offsets) { } static inline void __might_sleep(const char *file, int line) { } -# define might_sleep() do { might_resched(); } while (0) +# define might_sleep() do { } while (0) # define cant_sleep() do { } while (0) # define cant_migrate() do { } while (0) # define sched_annotate_sleep() do { } while (0) diff --git a/include/linux/preempt.h b/include/linux/preempt.h index 0abc6a673c41..dc5125b9c36b 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -197,7 +197,9 @@ extern void preempt_count_sub(int val); #define preempt_count_inc() preempt_count_add(1) #define preempt_count_dec() preempt_count_sub(1) -#ifdef CONFIG_PREEMPT_COUNT +#if !defined(CONFIG_PREEMPTION) || !defined(CONFIG_PREEMPT_COUNT) +#error "Configurations with !CONFIG_PREEMPTION or !CONFIG_PREEMPT_COUNT are not supported." +#endif #define preempt_disable() \ do { \ @@ -215,7 +217,6 @@ do { \ #define preemptible() (preempt_count() == 0 && !irqs_disabled()) -#ifdef CONFIG_PREEMPTION #define preempt_enable() \ do { \ barrier(); \ @@ -236,22 +237,6 @@ do { \ __preempt_schedule(); \ } while (0) -#else /* !CONFIG_PREEMPTION */ -#define preempt_enable() \ -do { \ - barrier(); \ - preempt_count_dec(); \ -} while (0) - -#define preempt_enable_notrace() \ -do { \ - barrier(); \ - __preempt_count_dec(); \ -} while (0) - -#define preempt_check_resched() do { } while (0) -#endif /* CONFIG_PREEMPTION */ - #define preempt_disable_notrace() \ do { \ __preempt_count_inc(); \ @@ -264,27 +249,6 @@ do { \ __preempt_count_dec(); \ } while (0) -#else /* !CONFIG_PREEMPT_COUNT */ - -/* - * Even if we don't have any preemption, we need preempt disable/enable - * to be barriers, so that we don't have things like get_user/put_user - * that can cause faults and scheduling migrate into our preempt-protected - * region. - */ -#define preempt_disable() barrier() -#define sched_preempt_enable_no_resched() barrier() -#define preempt_enable_no_resched() barrier() -#define preempt_enable() barrier() -#define preempt_check_resched() do { } while (0) - -#define preempt_disable_notrace() barrier() -#define preempt_enable_no_resched_notrace() barrier() -#define preempt_enable_notrace() barrier() -#define preemptible() 0 - -#endif /* CONFIG_PREEMPT_COUNT */ - #ifdef MODULE /* * Modules have no business playing preemption tricks. diff --git a/include/linux/sched.h b/include/linux/sched.h index 6dd206b2ef50..4dabd9530f98 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2088,9 +2088,7 @@ static inline bool test_tsk_need_resched_any(struct task_struct *tsk) * value indicates whether a reschedule was done in fact. * cond_resched_lock() will drop the spinlock before scheduling, */ -#ifndef CONFIG_PREEMPTION -extern int _cond_resched(void); -#else +#ifdef CONFIG_PREEMPTION static inline int _cond_resched(void) { return 0; } #endif