forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
88 lines
1.9 KiB
88 lines
1.9 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef __ASM_PREEMPT_H |
|
#define __ASM_PREEMPT_H |
|
|
|
#include <linux/thread_info.h> |
|
|
|
#define PREEMPT_ENABLED (0) |
|
|
|
static __always_inline int preempt_count(void) |
|
{ |
|
return READ_ONCE(current_thread_info()->preempt_count); |
|
} |
|
|
|
static __always_inline volatile int *preempt_count_ptr(void) |
|
{ |
|
return ¤t_thread_info()->preempt_count; |
|
} |
|
|
|
static __always_inline void preempt_count_set(int pc) |
|
{ |
|
*preempt_count_ptr() = pc; |
|
} |
|
|
|
/* |
|
* must be macros to avoid header recursion hell |
|
*/ |
|
#define init_task_preempt_count(p) do { \ |
|
task_thread_info(p)->preempt_count = FORK_PREEMPT_COUNT; \ |
|
} while (0) |
|
|
|
#define init_idle_preempt_count(p, cpu) do { \ |
|
task_thread_info(p)->preempt_count = PREEMPT_DISABLED; \ |
|
} while (0) |
|
|
|
static __always_inline void set_preempt_need_resched(void) |
|
{ |
|
} |
|
|
|
static __always_inline void clear_preempt_need_resched(void) |
|
{ |
|
} |
|
|
|
static __always_inline bool test_preempt_need_resched(void) |
|
{ |
|
return false; |
|
} |
|
|
|
/* |
|
* The various preempt_count add/sub methods |
|
*/ |
|
|
|
static __always_inline void __preempt_count_add(int val) |
|
{ |
|
*preempt_count_ptr() += val; |
|
} |
|
|
|
static __always_inline void __preempt_count_sub(int val) |
|
{ |
|
*preempt_count_ptr() -= val; |
|
} |
|
|
|
static __always_inline bool __preempt_count_dec_and_test(void) |
|
{ |
|
/* |
|
* Because of load-store architectures cannot do per-cpu atomic |
|
* operations; we cannot use PREEMPT_NEED_RESCHED because it might get |
|
* lost. |
|
*/ |
|
return !--*preempt_count_ptr() && tif_need_resched(); |
|
} |
|
|
|
/* |
|
* Returns true when we need to resched and can (barring IRQ state). |
|
*/ |
|
static __always_inline bool should_resched(int preempt_offset) |
|
{ |
|
return unlikely(preempt_count() == preempt_offset && |
|
tif_need_resched()); |
|
} |
|
|
|
#ifdef CONFIG_PREEMPTION |
|
extern asmlinkage void preempt_schedule(void); |
|
#define __preempt_schedule() preempt_schedule() |
|
extern asmlinkage void preempt_schedule_notrace(void); |
|
#define __preempt_schedule_notrace() preempt_schedule_notrace() |
|
#endif /* CONFIG_PREEMPTION */ |
|
|
|
#endif /* __ASM_PREEMPT_H */
|
|
|