| .. | .. |
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| 8 | 8 | |
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| 9 | 9 | #ifdef CONFIG_HAVE_MARCH_Z196_FEATURES |
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| 10 | 10 | |
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| 11 | +/* We use the MSB mostly because its available */ |
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| 12 | +#define PREEMPT_NEED_RESCHED 0x80000000 |
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| 11 | 13 | #define PREEMPT_ENABLED (0 + PREEMPT_NEED_RESCHED) |
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| 12 | 14 | |
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| 13 | 15 | static inline int preempt_count(void) |
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| .. | .. |
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| 27 | 29 | old, new) != old); |
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| 28 | 30 | } |
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| 29 | 31 | |
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| 30 | | -#define init_task_preempt_count(p) do { } while (0) |
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| 31 | | - |
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| 32 | | -#define init_idle_preempt_count(p, cpu) do { \ |
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| 33 | | - S390_lowcore.preempt_count = PREEMPT_ENABLED; \ |
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| 34 | | -} while (0) |
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| 35 | | - |
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| 36 | 32 | static inline void set_preempt_need_resched(void) |
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| 37 | 33 | { |
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| 38 | 34 | __atomic_and(~PREEMPT_NEED_RESCHED, &S390_lowcore.preempt_count); |
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| .. | .. |
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| 50 | 46 | |
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| 51 | 47 | static inline void __preempt_count_add(int val) |
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| 52 | 48 | { |
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| 53 | | - if (__builtin_constant_p(val) && (val >= -128) && (val <= 127)) |
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| 54 | | - __atomic_add_const(val, &S390_lowcore.preempt_count); |
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| 55 | | - else |
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| 56 | | - __atomic_add(val, &S390_lowcore.preempt_count); |
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| 49 | + /* |
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| 50 | + * With some obscure config options and CONFIG_PROFILE_ALL_BRANCHES |
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| 51 | + * enabled, gcc 12 fails to handle __builtin_constant_p(). |
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| 52 | + */ |
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| 53 | + if (!IS_ENABLED(CONFIG_PROFILE_ALL_BRANCHES)) { |
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| 54 | + if (__builtin_constant_p(val) && (val >= -128) && (val <= 127)) { |
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| 55 | + __atomic_add_const(val, &S390_lowcore.preempt_count); |
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| 56 | + return; |
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| 57 | + } |
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| 58 | + } |
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| 59 | + __atomic_add(val, &S390_lowcore.preempt_count); |
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| 57 | 60 | } |
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| 58 | 61 | |
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| 59 | 62 | static inline void __preempt_count_sub(int val) |
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| .. | .. |
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| 85 | 88 | { |
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| 86 | 89 | S390_lowcore.preempt_count = pc; |
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| 87 | 90 | } |
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| 88 | | - |
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| 89 | | -#define init_task_preempt_count(p) do { } while (0) |
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| 90 | | - |
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| 91 | | -#define init_idle_preempt_count(p, cpu) do { \ |
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| 92 | | - S390_lowcore.preempt_count = PREEMPT_ENABLED; \ |
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| 93 | | -} while (0) |
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| 94 | 91 | |
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| 95 | 92 | static inline void set_preempt_need_resched(void) |
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| 96 | 93 | { |
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| .. | .. |
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| 128 | 125 | |
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| 129 | 126 | #endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */ |
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| 130 | 127 | |
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| 131 | | -#ifdef CONFIG_PREEMPT |
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| 128 | +#define init_task_preempt_count(p) do { } while (0) |
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| 129 | +/* Deferred to CPU bringup time */ |
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| 130 | +#define init_idle_preempt_count(p, cpu) do { } while (0) |
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| 131 | + |
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| 132 | +#ifdef CONFIG_PREEMPTION |
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| 132 | 133 | extern asmlinkage void preempt_schedule(void); |
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| 133 | 134 | #define __preempt_schedule() preempt_schedule() |
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| 134 | 135 | extern asmlinkage void preempt_schedule_notrace(void); |
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| 135 | 136 | #define __preempt_schedule_notrace() preempt_schedule_notrace() |
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| 136 | | -#endif /* CONFIG_PREEMPT */ |
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| 137 | +#endif /* CONFIG_PREEMPTION */ |
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| 137 | 138 | |
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| 138 | 139 | #endif /* __ASM_PREEMPT_H */ |
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