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rcu: Clean up flavor-related definitions and comments in rcu.h

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Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-07-07 18:12:26 -07:00
parent 8c1cf2da6f
commit 7f87c036fe
1 changed files with 10 additions and 8 deletions
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18
kernel/rcu/rcu.h
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@ -176,8 +176,9 @@ static inline unsigned long rcu_seq_diff(unsigned long new, unsigned long old)
/* /*
* debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally * debug_rcu_head_queue()/debug_rcu_head_unqueue() are used internally
* by call_rcu() and rcu callback execution, and are therefore not part of the * by call_rcu() and rcu callback execution, and are therefore not part
* RCU API. Leaving in rcupdate.h because they are used by all RCU flavors. * of the RCU API. These are in rcupdate.h because they are used by all
* RCU implementations.
*/ */
#ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD
@ -328,7 +329,7 @@ static inline void rcu_init_levelspread(int *levelspread, const int *levelcnt)
} }
} }
/* Returns first leaf rcu_node of the specified RCU flavor. */ /* Returns a pointer to the first leaf rcu_node structure. */
#define rcu_first_leaf_node() (rcu_state.level[rcu_num_lvls - 1]) #define rcu_first_leaf_node() (rcu_state.level[rcu_num_lvls - 1])
/* Is this rcu_node a leaf? */ /* Is this rcu_node a leaf? */
@ -339,7 +340,8 @@ static inline void rcu_init_levelspread(int *levelspread, const int *levelcnt)
/* /*
* Do a full breadth-first scan of the {s,}rcu_node structures for the * Do a full breadth-first scan of the {s,}rcu_node structures for the
* specified rcu_state structure. * specified state structure (for SRCU) or the only rcu_state structure
* (for RCU).
*/ */
#define srcu_for_each_node_breadth_first(sp, rnp) \ #define srcu_for_each_node_breadth_first(sp, rnp) \
for ((rnp) = &(sp)->node[0]; \ for ((rnp) = &(sp)->node[0]; \
@ -348,10 +350,10 @@ static inline void rcu_init_levelspread(int *levelspread, const int *levelcnt)
srcu_for_each_node_breadth_first(&rcu_state, rnp) srcu_for_each_node_breadth_first(&rcu_state, rnp)
/* /*
* Scan the leaves of the rcu_node hierarchy for the specified rcu_state * Scan the leaves of the rcu_node hierarchy for the rcu_state structure.
* structure. Note that if there is a singleton rcu_node tree with but * Note that if there is a singleton rcu_node tree with but one rcu_node
* one rcu_node structure, this loop -will- visit the rcu_node structure. * structure, this loop -will- visit the rcu_node structure. It is still
* It is still a leaf node, even if it is also the root node. * a leaf node, even if it is also the root node.
*/ */
#define rcu_for_each_leaf_node(rnp) \ #define rcu_for_each_leaf_node(rnp) \
for ((rnp) = rcu_first_leaf_node(); \ for ((rnp) = rcu_first_leaf_node(); \