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

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Date:   Fri, 09 Oct 2020 06:35:29 -0000
From:   "tip-bot2 for Paul E. McKenney" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/rcu] scftorture: Consolidate scftorture_invoke_one() check
 and kfree()

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     676e5469643e716df7f39ef77ba8f09c85b0c4f8
Gitweb:        https://git.kernel.org/tip/676e5469643e716df7f39ef77ba8f09c85b0c4f8
Author:        Paul E. McKenney <paulmck@...nel.org>
AuthorDate:    Wed, 01 Jul 2020 14:13:02 -07:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Mon, 24 Aug 2020 18:38:35 -07:00

scftorture: Consolidate scftorture_invoke_one() check and kfree()

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