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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