// SPDX-License-Identifier: GPL-2.0 #include <config.h> #include <assert.h> #include <errno.h> #include <inttypes.h> #include <pthread.h> #include <stddef.h> #include <string.h> #include <sys/types.h> #include "int_typedefs.h" #include "barriers.h" #include "bug_on.h" #include "locks.h" #include "misc.h" #include "preempt.h" #include "percpu.h" #include "workqueues.h" #include <linux/srcu.h> /* Functions needed from modify_srcu.c */ bool try_check_zero(struct srcu_struct *sp, int idx, int trycount); void srcu_flip(struct srcu_struct *sp); /* Simpler implementation of synchronize_srcu that ignores batching. */ void synchronize_srcu(struct srcu_struct *sp) { int idx; /* * This code assumes that try_check_zero will succeed anyway, * so there is no point in multiple tries. */ const int trycount = 1; might_sleep(); /* Ignore the lock, as multiple writers aren't working yet anyway. */ idx = 1 ^ (sp->completed & 1); /* For comments see srcu_advance_batches. */ assume(try_check_zero(sp, idx, trycount)); srcu_flip(sp); assume(try_check_zero(sp, idx^1, trycount)); }