linux-kernel - [PATCH tip/core/rcu 11/19] scftorture: Consolidate scftorture_invoke_one() scf

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Date:   Mon, 31 Aug 2020 11:07:41 -0700
From:   paulmck@...nel.org
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com, 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@...nel.org>
Subject: [PATCH tip/core/rcu 11/19] scftorture: Consolidate scftorture_invoke_one() scf_check initialization

From: "Paul E. McKenney" <paulmck@...nel.org>

This commit hoists much of the initialization of the scf_check
structure out of the switch statement, thus saving a few lines of code.
The initialization of the ->scfc_in field remains in each leg of the
switch statement in order to more heavily stress memory ordering.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/scftorture.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/kernel/scftorture.c b/kernel/scftorture.c
index f220cd3..8ab72e5 100644
--- a/kernel/scftorture.c
+++ b/kernel/scftorture.c
@@ -299,8 +299,13 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 		preempt_disable();
 	if (scfsp->scfs_prim == SCF_PRIM_SINGLE || scfsp->scfs_wait) {
 		scfcp = kmalloc(sizeof(*scfcp), GFP_ATOMIC);
-		if (WARN_ON_ONCE(!scfcp))
+		if (WARN_ON_ONCE(!scfcp)) {
 			atomic_inc(&n_alloc_errs);
+		} else {
+			scfcp->scfc_cpu = -1;
+			scfcp->scfc_wait = scfsp->scfs_wait;
+			scfcp->scfc_out = false;
+		}
 	}
 	switch (scfsp->scfs_prim) {
 	case SCF_PRIM_SINGLE:
@@ -311,8 +316,6 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 			scfp->n_single++;
 		if (scfcp) {
 			scfcp->scfc_cpu = cpu;
-			scfcp->scfc_wait = scfsp->scfs_wait;
-			scfcp->scfc_out = false;
 			scfcp->scfc_in = true;
 		}
 		ret = smp_call_function_single(cpu, scf_handler_1, (void *)scfcp, scfsp->scfs_wait);
@@ -330,12 +333,8 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 			scfp->n_many_wait++;
 		else
 			scfp->n_many++;
-		if (scfcp) {
-			scfcp->scfc_cpu = -1;
-			scfcp->scfc_wait = true;
-			scfcp->scfc_out = false;
+		if (scfcp)
 			scfcp->scfc_in = true;
-		}
 		smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait);
 		break;
 	case SCF_PRIM_ALL:
@@ -343,12 +342,8 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 			scfp->n_all_wait++;
 		else
 			scfp->n_all++;
-		if (scfcp) {
-			scfcp->scfc_cpu = -1;
-			scfcp->scfc_wait = true;
-			scfcp->scfc_out = false;
+		if (scfcp)
 			scfcp->scfc_in = true;
-		}
 		smp_call_function(scf_handler, scfcp, scfsp->scfs_wait);
 		break;
 	}
-- 
2.9.5