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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/rcutiny.h
1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Read-Copy Update mechanism for mutual exclusion, the Bloatwatch edition.
5 * Copyright IBM Corporation, 2008
7 * Author: Paul E. McKenney <paulmck@linux.ibm.com>
9 * For detailed explanation of Read-Copy Update mechanism see -
12 #ifndef __LINUX_TINY_H
13 #define __LINUX_TINY_H
15 #include <linux/ktime.h>
17 /* Never flag non-existent other CPUs! */
18 static inline bool rcu_eqs_special_set(int cpu
) { return false; }
20 static inline unsigned long get_state_synchronize_rcu(void)
25 static inline void cond_synchronize_rcu(unsigned long oldstate
)
30 extern void rcu_barrier(void);
32 static inline void synchronize_rcu_expedited(void)
37 static inline void kfree_call_rcu(struct rcu_head
*head
, rcu_callback_t func
)
44 static inline void rcu_softirq_qs(void)
49 #define rcu_note_context_switch(preempt) \
52 rcu_tasks_qs(current); \
55 static inline int rcu_needs_cpu(u64 basemono
, u64
*nextevt
)
62 * Take advantage of the fact that there is only one CPU, which
63 * allows us to ignore virtualization-based context switches.
65 static inline void rcu_virt_note_context_switch(int cpu
) { }
66 static inline void rcu_cpu_stall_reset(void) { }
67 static inline int rcu_jiffies_till_stall_check(void) { return 21 * HZ
; }
68 static inline void rcu_idle_enter(void) { }
69 static inline void rcu_idle_exit(void) { }
70 static inline void rcu_irq_enter(void) { }
71 static inline void rcu_irq_exit_irqson(void) { }
72 static inline void rcu_irq_enter_irqson(void) { }
73 static inline void rcu_irq_exit(void) { }
74 static inline void exit_rcu(void) { }
75 static inline bool rcu_preempt_need_deferred_qs(struct task_struct
*t
)
79 static inline void rcu_preempt_deferred_qs(struct task_struct
*t
) { }
81 void rcu_scheduler_starting(void);
82 #else /* #ifndef CONFIG_SRCU */
83 static inline void rcu_scheduler_starting(void) { }
84 #endif /* #else #ifndef CONFIG_SRCU */
85 static inline void rcu_end_inkernel_boot(void) { }
86 static inline bool rcu_is_watching(void) { return true; }
88 /* Avoid RCU read-side critical sections leaking across. */
89 static inline void rcu_all_qs(void) { barrier(); }
91 /* RCUtree hotplug events */
92 #define rcutree_prepare_cpu NULL
93 #define rcutree_online_cpu NULL
94 #define rcutree_offline_cpu NULL
95 #define rcutree_dead_cpu NULL
96 #define rcutree_dying_cpu NULL
97 static inline void rcu_cpu_starting(unsigned int cpu
) { }
99 #endif /* __LINUX_RCUTINY_H */