linux-kernel - [PATCH tip/core/rcu 10/19] scftorture: Consolidate scftorture_invoke

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Message-Id: <20200831180749.843-10-paulmck@kernel.org>
Date:   Mon, 31 Aug 2020 11:07:40 -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 10/19] scftorture: Consolidate scftorture_invoke_one() check and kfree()

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

This commit moves checking of the ->scfc_out field and the freeing of
the scf_check structure down below the end of switch statement, thus
saving a few lines of code.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 kernel/scftorture.c | 26 ++++++++------------------
 1 file changed, 8 insertions(+), 18 deletions(-)

diff --git a/kernel/scftorture.c b/kernel/scftorture.c
index 0d7299d..f220cd3 100644
--- a/kernel/scftorture.c
+++ b/kernel/scftorture.c
@@ -289,7 +289,7 @@ static void scf_handler_1(void *scfc_in)
 static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_random_state *trsp)
 {
 	uintptr_t cpu;
-	int ret;
+	int ret = 0;
 	struct scf_check *scfcp = NULL;
 	struct scf_selector *scfsp = scf_sel_rand(trsp);
 
@@ -322,11 +322,7 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 			else
 				scfp->n_single_ofl++;
 			kfree(scfcp);
-		} else if (scfcp && scfsp->scfs_wait) {
-			if (WARN_ON_ONCE(!scfcp->scfc_out))
-				atomic_inc(&n_mb_out_errs); // Leak rather than trash!
-			else
-				kfree(scfcp);
+			scfcp = NULL;
 		}
 		break;
 	case SCF_PRIM_MANY:
@@ -341,12 +337,6 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 			scfcp->scfc_in = true;
 		}
 		smp_call_function_many(cpu_online_mask, scf_handler, scfcp, scfsp->scfs_wait);
-		if (scfcp) {
-			if (WARN_ON_ONCE(!scfcp->scfc_out))
-				atomic_inc(&n_mb_out_errs);  // Leak rather than trash!
-			else
-				kfree(scfcp);
-		}
 		break;
 	case SCF_PRIM_ALL:
 		if (scfsp->scfs_wait)
@@ -360,14 +350,14 @@ static void scftorture_invoke_one(struct scf_statistics *scfp, struct torture_ra
 			scfcp->scfc_in = true;
 		}
 		smp_call_function(scf_handler, scfcp, scfsp->scfs_wait);
-		if (scfcp) {
-			if (WARN_ON_ONCE(!scfcp->scfc_out))
-				atomic_inc(&n_mb_out_errs);  // Leak rather than trash!
-			else
-				kfree(scfcp);
-		}
 		break;
 	}
+	if (scfcp && scfsp->scfs_wait) {
+		if (WARN_ON_ONCE(!scfcp->scfc_out))
+			atomic_inc(&n_mb_out_errs); // Leak rather than trash!
+		else
+			kfree(scfcp);
+	}
 	if (use_cpus_read_lock)
 		cpus_read_unlock();
 	else
-- 
2.9.5