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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | #ifndef __LINUX_PREEMPT_H #define __LINUX_PREEMPT_H /* * include/linux/preempt.h - macros for accessing and manipulating * preempt_count (used for kernel preemption, interrupt count, etc.) */ #include <linux/thread_info.h> #include <linux/linkage.h> #include <linux/list.h> #ifdef CONFIG_DEBUG_PREEMPT extern void fastcall add_preempt_count(int val); extern void fastcall sub_preempt_count(int val); #else # define add_preempt_count(val) do { preempt_count() += (val); } while (0) # define sub_preempt_count(val) do { preempt_count() -= (val); } while (0) #endif #define inc_preempt_count() add_preempt_count(1) #define dec_preempt_count() sub_preempt_count(1) #define preempt_count() (current_thread_info()->preempt_count) #ifdef CONFIG_PREEMPT asmlinkage void preempt_schedule(void); #define preempt_disable() \ do { \ inc_preempt_count(); \ barrier(); \ } while (0) #define preempt_enable_no_resched() \ do { \ barrier(); \ dec_preempt_count(); \ } while (0) #define preempt_check_resched() \ do { \ if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \ preempt_schedule(); \ } while (0) #define preempt_enable() \ do { \ preempt_enable_no_resched(); \ barrier(); \ preempt_check_resched(); \ } while (0) #else #define preempt_disable() do { } while (0) #define preempt_enable_no_resched() do { } while (0) #define preempt_enable() do { } while (0) #define preempt_check_resched() do { } while (0) #endif #ifdef CONFIG_PREEMPT_NOTIFIERS struct preempt_notifier; /** * preempt_ops - notifiers called when a task is preempted and rescheduled * @sched_in: we're about to be rescheduled: * notifier: struct preempt_notifier for the task being scheduled * cpu: cpu we're scheduled on * @sched_out: we've just been preempted * notifier: struct preempt_notifier for the task being preempted * next: the task that's kicking us out */ struct preempt_ops { void (*sched_in)(struct preempt_notifier *notifier, int cpu); void (*sched_out)(struct preempt_notifier *notifier, struct task_struct *next); }; /** * preempt_notifier - key for installing preemption notifiers * @link: internal use * @ops: defines the notifier functions to be called * * Usually used in conjunction with container_of(). */ struct preempt_notifier { struct hlist_node link; struct preempt_ops *ops; }; void preempt_notifier_register(struct preempt_notifier *notifier); void preempt_notifier_unregister(struct preempt_notifier *notifier); static inline void preempt_notifier_init(struct preempt_notifier *notifier, struct preempt_ops *ops) { INIT_HLIST_NODE(¬ifier->link); notifier->ops = ops; } #endif #endif /* __LINUX_PREEMPT_H */ |