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Howlett" , Matthew Wilcox Cc: maple-tree@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Pedro Falcato Subject: [PATCH 1/2] maple_tree: Use kfree_rcu in ma_free_rcu Date: Fri, 18 Jul 2025 18:21:36 +0100 Message-ID: <20250718172138.103116-1-pfalcato@suse.de> X-Mailer: git-send-email 2.50.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; MIME_TRACE(0.00)[0:+]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:mid,suse.de:email]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCPT_COUNT_SEVEN(0.00)[7]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_DN_SOME(0.00)[]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Level: X-Spam-Score: -2.80 kfree_rcu is an optimized version of call_rcu + kfree. It used to not be possible to call it on non-kmalloc objects, but this restriction was lifted ever since SLOB was dropped from the kernel, and since commit 6c6c47b063b5 ("mm, slab: call kvfree_rcu_barrier() from kmem_cache_destroy()"). Thus, replace call_rcu + mt_free_rcu with kfree_rcu. Signed-off-by: Pedro Falcato --- lib/maple_tree.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index b4ee2d29d7a9..91da2d9d00c3 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -191,13 +191,6 @@ static inline void mt_free_bulk(size_t size, void __rcu **nodes) kmem_cache_free_bulk(maple_node_cache, size, (void **)nodes); } -static void mt_free_rcu(struct rcu_head *head) -{ - struct maple_node *node = container_of(head, struct maple_node, rcu); - - kmem_cache_free(maple_node_cache, node); -} - /* * ma_free_rcu() - Use rcu callback to free a maple node * @node: The node to free @@ -208,7 +201,7 @@ static void mt_free_rcu(struct rcu_head *head) static void ma_free_rcu(struct maple_node *node) { WARN_ON(node->parent != ma_parent_ptr(node)); - call_rcu(&node->rcu, mt_free_rcu); + kfree_rcu(node, rcu); } static void mt_set_height(struct maple_tree *mt, unsigned char height) @@ -5281,7 +5274,7 @@ static void mt_free_walk(struct rcu_head *head) mt_free_bulk(node->slot_len, slots); free_leaf: - mt_free_rcu(&node->rcu); + mt_free_one(node); } static inline void __rcu **mte_destroy_descend(struct maple_enode **enode, @@ -5365,7 +5358,7 @@ static void mt_destroy_walk(struct maple_enode *enode, struct maple_tree *mt, free_leaf: if (free) - mt_free_rcu(&node->rcu); + mt_free_one(node); else mt_clear_meta(mt, node, node->type); } -- 2.50.1