PNP0A03 *l4( (  fB- _I|+ /* SPDX-License-Identifier: GPL-2.0+ */ /* * Sleepable Read-Copy Update mechanism for mutual exclusion, * tiny variant. * * Copyright (C) IBM Corporation, 2017 * * Author: Paul McKenney */ #ifndef _LINUX_SRCU_TINY_H #define _LINUX_SRCU_TINY_H #include struct srcu_struct { short srcu_lock_nesting[2]; /* srcu_read_lock() nesting depth. */ u8 srcu_gp_running; /* GP workqueue running? */ u8 srcu_gp_waiting; /* GP waiting for readers? */ unsigned long srcu_idx; /* Current reader array element in bit 0x2. */ unsigned long srcu_idx_max; /* Furthest future srcu_idx request. */ struct swait_queue_head srcu_wq; /* Last srcu_read_unlock() wakes GP. */ struct rcu_head *srcu_cb_head; /* Pending callbacks: Head. */ struct rcu_head **srcu_cb_tail; /* Pending callbacks: Tail. */ struct work_struct srcu_work; /* For driving grace periods. */ #ifdef CONFIG_DEBUG_LOCK_ALLOC struct lockdep_map dep_map; #endif /* #ifdef CONFIG_DEBUG_LOCK_ALLOC */ }; void srcu_drive_gp(struct work_struct *wp); #define __SRCU_STRUCT_INIT(name, __ignored, ___ignored) \ { \ .srcu_wq = __SWAIT_QUEUE_HEAD_INITIALIZER(name.srcu_wq), \ .srcu_cb_tail = &name.srcu_cb_head, \ .srcu_work = __WORK_INITIALIZER(name.srcu_work, srcu_drive_gp), \ __SRCU_DEP_MAP_INIT(name) \ } /* * This odd _STATIC_ arrangement is needed for API compatibility with * Tree SRCU, which needs some per-CPU data. */ #define DEFINE_SRCU(name) \ struct srcu_struct name = __SRCU_STRUCT_INIT(name, name, name) #define DEFINE_STATIC_SRCU(name) \ static struct srcu_struct name = __SRCU_STRUCT_INIT(name, name, name) void synchronize_srcu(struct srcu_struct *ssp); /* * Counts the new reader in the appropriate per-CPU element of the * srcu_struct. Can be invoked from irq/bh handlers, but the matching * __srcu_read_unlock() must be in the same handler instance. Returns an * index that must be passed to the matching srcu_read_unlock(). */ static inline int __srcu_read_lock(struct srcu_struct *ssp) { int idx; preempt_disable(); // Needed for PREEMPT_AUTO idx = ((READ_ONCE(ssp->srcu_idx) + 1) & 0x2) >> 1; WRITE_ONCE(ssp->srcu_lock_nesting[idx], READ_ONCE(ssp->srcu_lock_nesting[idx]) + 1); preempt_enable(); return idx; } static inline void synchronize_srcu_expedited(struct srcu_struct *ssp) { synchronize_srcu(ssp); } static inline void srcu_barrier(struct srcu_struct *ssp) { synchronize_srcu(ssp); } /* Defined here to avoid size increase for non-torture kernels. */ static inline void srcu_torture_stats_print(struct srcu_struct *ssp, char *tt, char *tf) { int idx; idx = ((data_race(READ_ONCE(ssp->srcu_idx)) + 1) & 0x2) >> 1; pr_alert("%s%s Tiny SRCU per-CPU(idx=%d): (%hd,%hd) gp: %lu->%lu\n", tt, tf, idx, data_race(READ_ONCE(ssp->srcu_lock_nesting[!idx])), data_race(READ_ONCE(ssp->srcu_lock_nesting[idx])), data_race(READ_ONCE(ssp->srcu_idx)), data_race(READ_ONCE(ssp->srcu_idx_max))); } #endif  0  h0 File not found.  { f Index of /anon_sym/anon/proc/thread-self/root/lib/locale/en_DK

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