projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| c360192b MS |
1 | #ifndef __ASM_PREEMPT_H |
| 2 | #define __ASM_PREEMPT_H | |
| 3 | ||
| 4 | #include <asm/current.h> | |
| 5 | #include <linux/thread_info.h> | |
| 6 | #include <asm/atomic_ops.h> | |
| 7 | ||
| 8 | #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES | |
| 9 | ||
| 10 | #define PREEMPT_ENABLED (0 + PREEMPT_NEED_RESCHED) | |
| 11 | ||
| 12 | static inline int preempt_count(void) | |
| 13 | { | |
| 14 | return READ_ONCE(S390_lowcore.preempt_count) & ~PREEMPT_NEED_RESCHED; | |
| 15 | } | |
| 16 | ||
| 17 | static inline void preempt_count_set(int pc) | |
| 18 | { | |
| 19 | int old, new; | |
| 20 | ||
| 21 | do { | |
| 22 | old = READ_ONCE(S390_lowcore.preempt_count); | |
| 23 | new = (old & PREEMPT_NEED_RESCHED) | | |
| 24 | (pc & ~PREEMPT_NEED_RESCHED); | |
| 25 | } while (__atomic_cmpxchg(&S390_lowcore.preempt_count, | |
| 26 | old, new) != old); | |
| 27 | } | |
| 28 | ||
| 29 | #define init_task_preempt_count(p) do { } while (0) | |
| 30 | ||
| 31 | #define init_idle_preempt_count(p, cpu) do { \ | |
| 32 | S390_lowcore.preempt_count = PREEMPT_ENABLED; \ | |
| 33 | } while (0) | |
| 34 | ||
| 35 | static inline void set_preempt_need_resched(void) | |
| 36 | { | |
| 37 | __atomic_and(~PREEMPT_NEED_RESCHED, &S390_lowcore.preempt_count); | |
| 38 | } | |
| 39 | ||
| 40 | static inline void clear_preempt_need_resched(void) | |
| 41 | { | |
| 42 | __atomic_or(PREEMPT_NEED_RESCHED, &S390_lowcore.preempt_count); | |
| 43 | } | |
| 44 | ||
| 45 | static inline bool test_preempt_need_resched(void) | |
| 46 | { | |
| 47 | return !(READ_ONCE(S390_lowcore.preempt_count) & PREEMPT_NEED_RESCHED); | |
| 48 | } | |
| 49 | ||
| 50 | static inline void __preempt_count_add(int val) | |
| 51 | { | |
| 52 | if (__builtin_constant_p(val) && (val >= -128) && (val <= 127)) | |
| 53 | __atomic_add_const(val, &S390_lowcore.preempt_count); | |
| 54 | else | |
| 55 | __atomic_add(val, &S390_lowcore.preempt_count); | |
| 56 | } | |
| 57 | ||
| 58 | static inline void __preempt_count_sub(int val) | |
| 59 | { | |
| 60 | __preempt_count_add(-val); | |
| 61 | } | |
| 62 | ||
| 63 | static inline bool __preempt_count_dec_and_test(void) | |
| 64 | { | |
| 65 | return __atomic_add(-1, &S390_lowcore.preempt_count) == 1; | |
| 66 | } | |
| 67 | ||
| 68 | static inline bool should_resched(int preempt_offset) | |
| 69 | { | |
| 70 | return unlikely(READ_ONCE(S390_lowcore.preempt_count) == | |
| 71 | preempt_offset); | |
| 72 | } | |
| 73 | ||
| 74 | #else /* CONFIG_HAVE_MARCH_Z196_FEATURES */ | |
| 75 | ||
| 76 | #define PREEMPT_ENABLED (0) | |
| 77 | ||
| 78 | static inline int preempt_count(void) | |
| 79 | { | |
| 80 | return READ_ONCE(S390_lowcore.preempt_count); | |
| 81 | } | |
| 82 | ||
| 83 | static inline void preempt_count_set(int pc) | |
| 84 | { | |
| 85 | S390_lowcore.preempt_count = pc; | |
| 86 | } | |
| 87 | ||
| 88 | #define init_task_preempt_count(p) do { } while (0) | |
| 89 | ||
| 90 | #define init_idle_preempt_count(p, cpu) do { \ | |
| 91 | S390_lowcore.preempt_count = PREEMPT_ENABLED; \ | |
| 92 | } while (0) | |
| 93 | ||
| 94 | static inline void set_preempt_need_resched(void) | |
| 95 | { | |
| 96 | } | |
| 97 | ||
| 98 | static inline void clear_preempt_need_resched(void) | |
| 99 | { | |
| 100 | } | |
| 101 | ||
| 102 | static inline bool test_preempt_need_resched(void) | |
| 103 | { | |
| 104 | return false; | |
| 105 | } | |
| 106 | ||
| 107 | static inline void __preempt_count_add(int val) | |
| 108 | { | |
| 109 | S390_lowcore.preempt_count += val; | |
| 110 | } | |
| 111 | ||
| 112 | static inline void __preempt_count_sub(int val) | |
| 113 | { | |
| 114 | S390_lowcore.preempt_count -= val; | |
| 115 | } | |
| 116 | ||
| 117 | static inline bool __preempt_count_dec_and_test(void) | |
| 118 | { | |
| 119 | return !--S390_lowcore.preempt_count && tif_need_resched(); | |
| 120 | } | |
| 121 | ||
| 122 | static inline bool should_resched(int preempt_offset) | |
| 123 | { | |
| 124 | return unlikely(preempt_count() == preempt_offset && | |
| 125 | tif_need_resched()); | |
| 126 | } | |
| 127 | ||
| 128 | #endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */ | |
| 129 | ||
| 130 | #ifdef CONFIG_PREEMPT | |
| 131 | extern asmlinkage void preempt_schedule(void); | |
| 132 | #define __preempt_schedule() preempt_schedule() | |
| 133 | extern asmlinkage void preempt_schedule_notrace(void); | |
| 134 | #define __preempt_schedule_notrace() preempt_schedule_notrace() | |
| 135 | #endif /* CONFIG_PREEMPT */ | |
| 136 | ||
| 137 | #endif /* __ASM_PREEMPT_H */ |