diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/compiler.h | 2 | ||||
| -rw-r--r-- | include/linux/sched/rt.h | 22 |
2 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h index c6d06e91f..4b13e0cb2 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -437,6 +437,8 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s * handlers, all running on the same CPU. */ #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) +#define READ_ONCE(x) ACCESS_ONCE(x) +#define WRITE_ONCE(x, val) ACCESS_ONCE(x) = val /* Ignore/forbid kprobes attach on very low level functions marked by this attribute: */ #ifdef CONFIG_KPROBES diff --git a/include/linux/sched/rt.h b/include/linux/sched/rt.h index 440434df3..d926ad5b2 100644 --- a/include/linux/sched/rt.h +++ b/include/linux/sched/rt.h @@ -20,6 +20,18 @@ #define MAX_PRIO (MAX_RT_PRIO + 40) #define DEFAULT_PRIO (MAX_RT_PRIO + 20) +#define MAX_NICE 19 +#define MIN_NICE -20 + +/* + * Convert user-nice values [ -20 ... 0 ... 19 ] + * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ], + * and back. + */ +#define NICE_TO_PRIO(nice) (MAX_RT_PRIO + (nice) + 20) +#define PRIO_TO_NICE(prio) ((prio) - MAX_RT_PRIO - 20) +#define TASK_NICE(p) PRIO_TO_NICE((p)->static_prio) + static inline int rt_prio(int prio) { if (unlikely(prio < MAX_RT_PRIO)) @@ -61,4 +73,14 @@ extern void normalize_rt_tasks(void); */ #define RR_TIMESLICE (100 * HZ / 1000) +/* + * Convert nice value [19,-20] to rlimit style value [1,40]. + */ +#define nice_to_rlimit(nice) (MAX_NICE - nice + 1) + +/* + * Convert rlimit style value [1,40] to nice value [-20, 19]. + */ +#define rlimit_to_nice(prio) (MAX_NICE - prio + 1) + #endif /* _SCHED_RT_H */ |