netdev - [PATCH v4 bpf-next 13/14] bpf: Convert bpf_cpumask to bpf_mem_cache_free

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Date: Wed,  5 Jul 2023 20:34:46 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: daniel@...earbox.net,
	andrii@...nel.org,
	void@...ifault.com,
	houtao@...weicloud.com,
	paulmck@...nel.org
Cc: tj@...nel.org,
	rcu@...r.kernel.org,
	netdev@...r.kernel.org,
	bpf@...r.kernel.org,
	kernel-team@...com
Subject: [PATCH v4 bpf-next 13/14] bpf: Convert bpf_cpumask to bpf_mem_cache_free_rcu.

From: Alexei Starovoitov <ast@...nel.org>

Convert bpf_cpumask to bpf_mem_cache_free_rcu.
Note that migrate_disable() in bpf_cpumask_release() is still necessary, since
bpf_cpumask_release() is a dtor. bpf_obj_free_fields() can be converted to do
migrate_disable() there in a follow up.

Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Acked-by: David Vernet <void@...ifault.com>
---
 kernel/bpf/cpumask.c | 20 ++++++--------------
 1 file changed, 6 insertions(+), 14 deletions(-)

diff --git a/kernel/bpf/cpumask.c b/kernel/bpf/cpumask.c
index 938a60ff4295..6983af8e093c 100644
--- a/kernel/bpf/cpumask.c
+++ b/kernel/bpf/cpumask.c
@@ -9,7 +9,6 @@
 /**
  * struct bpf_cpumask - refcounted BPF cpumask wrapper structure
  * @cpumask:	The actual cpumask embedded in the struct.
- * @rcu:	The RCU head used to free the cpumask with RCU safety.
  * @usage:	Object reference counter. When the refcount goes to 0, the
  *		memory is released back to the BPF allocator, which provides
  *		RCU safety.
@@ -25,7 +24,6 @@
  */
 struct bpf_cpumask {
 	cpumask_t cpumask;
-	struct rcu_head rcu;
 	refcount_t usage;
 };
 
@@ -82,16 +80,6 @@ __bpf_kfunc struct bpf_cpumask *bpf_cpumask_acquire(struct bpf_cpumask *cpumask)
 	return cpumask;
 }
 
-static void cpumask_free_cb(struct rcu_head *head)
-{
-	struct bpf_cpumask *cpumask;
-
-	cpumask = container_of(head, struct bpf_cpumask, rcu);
-	migrate_disable();
-	bpf_mem_cache_free(&bpf_cpumask_ma, cpumask);
-	migrate_enable();
-}
-
 /**
  * bpf_cpumask_release() - Release a previously acquired BPF cpumask.
  * @cpumask: The cpumask being released.
@@ -102,8 +90,12 @@ static void cpumask_free_cb(struct rcu_head *head)
  */
 __bpf_kfunc void bpf_cpumask_release(struct bpf_cpumask *cpumask)
 {
-	if (refcount_dec_and_test(&cpumask->usage))
-		call_rcu(&cpumask->rcu, cpumask_free_cb);
+	if (!refcount_dec_and_test(&cpumask->usage))
+		return;
+
+	migrate_disable();
+	bpf_mem_cache_free_rcu(&bpf_cpumask_ma, cpumask);
+	migrate_enable();
 }
 
 /**
-- 
2.34.1