linux-kernel - [PATCH v2 1/7] mm, slab: dissolve shutdown

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Message-Id: <20240807-b4-slab-kfree_rcu-destroy-v2-1-ea79102f428c@suse.cz>
Date: Wed, 07 Aug 2024 12:31:14 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: "Paul E. McKenney" <paulmck@...nel.org>, 
 Joel Fernandes <joel@...lfernandes.org>, 
 Josh Triplett <josh@...htriplett.org>, Boqun Feng <boqun.feng@...il.com>, 
 Christoph Lameter <cl@...ux.com>, David Rientjes <rientjes@...gle.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, 
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
 Lai Jiangshan <jiangshanlai@...il.com>, Zqiang <qiang.zhang1211@...il.com>, 
 Julia Lawall <Julia.Lawall@...ia.fr>, Jakub Kicinski <kuba@...nel.org>, 
 "Jason A. Donenfeld" <Jason@...c4.com>, 
 "Uladzislau Rezki (Sony)" <urezki@...il.com>, 
 Andrew Morton <akpm@...ux-foundation.org>, 
 Roman Gushchin <roman.gushchin@...ux.dev>, 
 Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org, 
 linux-kernel@...r.kernel.org, rcu@...r.kernel.org, 
 Alexander Potapenko <glider@...gle.com>, Marco Elver <elver@...gle.com>, 
 Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com, 
 Jann Horn <jannh@...gle.com>, Mateusz Guzik <mjguzik@...il.com>, 
 Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH v2 1/7] mm, slab: dissolve shutdown_cache() into its caller

There's only one caller of shutdown_cache() so move the code into it.
Preparatory patch for further changes, no functional change.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/slab_common.c | 40 ++++++++++++++++++----------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 40b582a014b8..b76d65d7fe33 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -540,27 +540,6 @@ static void slab_caches_to_rcu_destroy_workfn(struct work_struct *work)
 	}
 }

-static int shutdown_cache(struct kmem_cache *s)
-{
-	/* free asan quarantined objects */
-	kasan_cache_shutdown(s);
-
-	if (__kmem_cache_shutdown(s) != 0)
-		return -EBUSY;
-
-	list_del(&s->list);
-
-	if (s->flags & SLAB_TYPESAFE_BY_RCU) {
-		list_add_tail(&s->list, &slab_caches_to_rcu_destroy);
-		schedule_work(&slab_caches_to_rcu_destroy_work);
-	} else {
-		kfence_shutdown_cache(s);
-		debugfs_slab_release(s);
-	}
-
-	return 0;
-}
-
 void slab_kmem_cache_release(struct kmem_cache *s)
 {
 	__kmem_cache_release(s);
@@ -585,9 +564,26 @@ void kmem_cache_destroy(struct kmem_cache *s)
 	if (s->refcount)
 		goto out_unlock;

-	err = shutdown_cache(s);
+	/* free asan quarantined objects */
+	kasan_cache_shutdown(s);
+
+	err = __kmem_cache_shutdown(s);
 	WARN(err, "%s %s: Slab cache still has objects when called from %pS",
 	     __func__, s->name, (void *)_RET_IP_);
+
+	if (err)
+		goto out_unlock;
+
+	list_del(&s->list);
+
+	if (rcu_set) {
+		list_add_tail(&s->list, &slab_caches_to_rcu_destroy);
+		schedule_work(&slab_caches_to_rcu_destroy_work);
+	} else {
+		kfence_shutdown_cache(s);
+		debugfs_slab_release(s);
+	}
+
 out_unlock:
 	mutex_unlock(&slab_mutex);
 	cpus_read_unlock();

-- 
2.46.0