linux-kernel - [PATCH tip/core/rcu 16/19] rcu: Eliminate rcu

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Message-Id: <20180829222047.319-16-paulmck@linux.vnet.ibm.com>
Date:   Wed, 29 Aug 2018 15:20:44 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 16/19] rcu: Eliminate rcu_state structure's ->call field

The rcu_state structure's ->call field references the corresponding RCU
flavor's call_rcu() function.  However, now that there is only ever one
rcu_state structure in a given build of the Linux kernel, and that flavor
uses plain old call_rcu(), there is not a lot of point in continuing to
have the ->call field.  This commit therefore removes it.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c     | 1 -
 kernel/rcu/tree.h     | 1 -
 kernel/rcu/tree_exp.h | 2 +-
 3 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 1868df8089ba..0c736e078fe6 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -76,7 +76,6 @@ static DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_data, rcu_data);
 struct rcu_state rcu_state = {
 	.level = { &rcu_state.node[0] },
 	.rda = &rcu_data,
-	.call = call_rcu,
 	.gp_state = RCU_GP_IDLE,
 	.gp_seq = (0UL - 300UL) << RCU_SEQ_CTR_SHIFT,
 	.barrier_mutex = __MUTEX_INITIALIZER(rcu_state.barrier_mutex),
diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h
index 3f36562d3118..c50060567146 100644
--- a/kernel/rcu/tree.h
+++ b/kernel/rcu/tree.h
@@ -313,7 +313,6 @@ struct rcu_state {
 						/* Hierarchy levels (+1 to */
 						/*  shut bogus gcc warning) */
 	struct rcu_data __percpu *rda;		/* pointer of percu rcu_data. */
-	call_rcu_func_t call;			/* call_rcu() flavor. */
 	int ncpus;				/* # CPUs seen so far. */
 
 	/* The following fields are guarded by the root rcu_node's lock. */
diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h
index 5619edfd414e..224f05f0c0c9 100644
--- a/kernel/rcu/tree_exp.h
+++ b/kernel/rcu/tree_exp.h
@@ -619,7 +619,7 @@ static void _synchronize_rcu_expedited(struct rcu_state *rsp,
 
 	/* If expedited grace periods are prohibited, fall back to normal. */
 	if (rcu_gp_is_normal()) {
-		wait_rcu_gp(rsp->call);
+		wait_rcu_gp(call_rcu);
 		return;
 	}
 
-- 
2.17.1