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132 lines
2.9 KiB
132 lines
2.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_PREEMPT_H |
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#define __ASM_PREEMPT_H |
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#include <asm/current.h> |
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#include <linux/thread_info.h> |
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#include <asm/atomic_ops.h> |
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#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES |
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/* We use the MSB mostly because its available */ |
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#define PREEMPT_NEED_RESCHED 0x80000000 |
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#define PREEMPT_ENABLED (0 + PREEMPT_NEED_RESCHED) |
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static inline int preempt_count(void) |
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{ |
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return READ_ONCE(S390_lowcore.preempt_count) & ~PREEMPT_NEED_RESCHED; |
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} |
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static inline void preempt_count_set(int pc) |
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{ |
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int old, new; |
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do { |
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old = READ_ONCE(S390_lowcore.preempt_count); |
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new = (old & PREEMPT_NEED_RESCHED) | |
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(pc & ~PREEMPT_NEED_RESCHED); |
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} while (__atomic_cmpxchg(&S390_lowcore.preempt_count, |
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old, new) != old); |
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} |
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static inline void set_preempt_need_resched(void) |
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{ |
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__atomic_and(~PREEMPT_NEED_RESCHED, &S390_lowcore.preempt_count); |
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} |
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static inline void clear_preempt_need_resched(void) |
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{ |
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__atomic_or(PREEMPT_NEED_RESCHED, &S390_lowcore.preempt_count); |
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} |
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static inline bool test_preempt_need_resched(void) |
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{ |
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return !(READ_ONCE(S390_lowcore.preempt_count) & PREEMPT_NEED_RESCHED); |
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} |
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static inline void __preempt_count_add(int val) |
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{ |
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if (__builtin_constant_p(val) && (val >= -128) && (val <= 127)) |
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__atomic_add_const(val, &S390_lowcore.preempt_count); |
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else |
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__atomic_add(val, &S390_lowcore.preempt_count); |
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} |
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static inline void __preempt_count_sub(int val) |
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{ |
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__preempt_count_add(-val); |
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} |
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static inline bool __preempt_count_dec_and_test(void) |
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{ |
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return __atomic_add(-1, &S390_lowcore.preempt_count) == 1; |
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} |
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static inline bool should_resched(int preempt_offset) |
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{ |
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return unlikely(READ_ONCE(S390_lowcore.preempt_count) == |
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preempt_offset); |
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} |
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#else /* CONFIG_HAVE_MARCH_Z196_FEATURES */ |
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#define PREEMPT_ENABLED (0) |
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static inline int preempt_count(void) |
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{ |
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return READ_ONCE(S390_lowcore.preempt_count); |
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} |
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static inline void preempt_count_set(int pc) |
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{ |
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S390_lowcore.preempt_count = pc; |
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} |
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static inline void set_preempt_need_resched(void) |
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{ |
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} |
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static inline void clear_preempt_need_resched(void) |
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{ |
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} |
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static inline bool test_preempt_need_resched(void) |
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{ |
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return false; |
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} |
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static inline void __preempt_count_add(int val) |
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{ |
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S390_lowcore.preempt_count += val; |
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} |
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static inline void __preempt_count_sub(int val) |
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{ |
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S390_lowcore.preempt_count -= val; |
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} |
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static inline bool __preempt_count_dec_and_test(void) |
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{ |
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return !--S390_lowcore.preempt_count && tif_need_resched(); |
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} |
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static inline bool should_resched(int preempt_offset) |
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{ |
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return unlikely(preempt_count() == preempt_offset && |
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tif_need_resched()); |
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} |
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#endif /* CONFIG_HAVE_MARCH_Z196_FEATURES */ |
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#define init_task_preempt_count(p) do { } while (0) |
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/* Deferred to CPU bringup time */ |
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#define init_idle_preempt_count(p, cpu) do { } while (0) |
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#ifdef CONFIG_PREEMPTION |
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extern void preempt_schedule(void); |
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#define __preempt_schedule() preempt_schedule() |
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extern void preempt_schedule_notrace(void); |
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#define __preempt_schedule_notrace() preempt_schedule_notrace() |
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#endif /* CONFIG_PREEMPTION */ |
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#endif /* __ASM_PREEMPT_H */
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