include/linux/srcutree.h

1 /* SPDX-License-Identifier: GPL-2.0+ */
3  * Sleepable Read-Copy Update mechanism for mutual exclusion,
21  * Per-CPU structure feeding into leaf srcu_node, similar in function
25 	/* Read-side state. */
26 	unsigned long srcu_lock_count[2];	/* Locks per CPU. */
27 	unsigned long srcu_unlock_count[2];	/* Unlocks per CPU. */
29 	/* Update-side state. */
40 						/*  ->srcu_data_have_cbs[]. */
41 	int cpu;  member
52 						/*  is > ->srcu_gq_seq. */
57 	int grplo;				/* Least CPU for node. */
58 	int grphi;				/* Biggest CPU for node. */
62  * Per-SRCU-domain structure, similar in function to rcu_state.
72 	unsigned long srcu_gp_seq;		/* Grace-period seq #. */
76 	struct srcu_data __percpu *sda;		/* Per-CPU srcu_data array. */
90 /* Values for state variable (bottom bits of ->srcu_gp_seq). */
99 	.srcu_gp_seq_needed = -1UL,					\
106  * Do -not- call init_srcu_struct() nor cleanup_srcu_struct() on it.
109  * files, the per-CPU variable rules nevertheless require that the
121  * See include/linux/percpu-defs.h for the rules on per-CPU variables.