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hc

2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/include/linux/rcupdate_wait.h
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@@ -33,17 +33,19 @@
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 /**
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  * synchronize_rcu_mult - Wait concurrently for multiple grace periods
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- * @...: List of call_rcu() functions for the flavors to wait on.
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+ * @...: List of call_rcu() functions for different grace periods to wait on
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  *
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- * This macro waits concurrently for multiple flavors of RCU grace periods.
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- * For example, synchronize_rcu_mult(call_rcu, call_rcu_bh) would wait
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- * on concurrent RCU and RCU-bh grace periods.  Waiting on a give SRCU
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+ * This macro waits concurrently for multiple types of RCU grace periods.
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+ * For example, synchronize_rcu_mult(call_rcu, call_rcu_tasks) would wait
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+ * on concurrent RCU and RCU-tasks grace periods.  Waiting on a given SRCU
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  * domain requires you to write a wrapper function for that SRCU domain's
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- * call_srcu() function, supplying the corresponding srcu_struct.
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+ * call_srcu() function, with this wrapper supplying the pointer to the
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+ * corresponding srcu_struct.
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  *
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- * If Tiny RCU, tell _wait_rcu_gp() not to bother waiting for RCU
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- * or RCU-bh, given that anywhere synchronize_rcu_mult() can be called
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- * is automatically a grace period.
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+ * The first argument tells Tiny RCU's _wait_rcu_gp() not to
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+ * bother waiting for RCU.  The reason for this is because anywhere
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+ * synchronize_rcu_mult() can be called is automatically already a full
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+ * grace period.
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  */
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 #define synchronize_rcu_mult(...) \
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 	_wait_rcu_gp(IS_ENABLED(CONFIG_TINY_RCU), __VA_ARGS__)