[PATCH slab/for-next 05/14] net: skbuff: specify SLAB_MAY_ACCOUNT for skbuff_head_cache

["Harry Yoo (Meta)" <harry@kernel.org>]

AF_UNIX sets sk->sk_allocation to GFP_KERNEL_ACCOUNT, so skbs can be
allocated from skbuff_head_cache with __GFP_ACCOUNT. Specify
SLAB_MAY_ACCOUNT when the object may be charged to a memcg.
__GFP_ACCOUNT without SLAB_MAY_ACCOUNT will not be allowed.

Path: unix_dgram_sendmsg() -> sock_alloc_send_pskb(sk->sk_allocation)
  -> alloc_skb_with_frags() -> __alloc_skb()
  -> kmem_cache_alloc_node(skbuff_head_cache)

Assisted-by: LLM
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Simon Horman <horms@kernel.org>
Cc: Jason Xing <kerneljasonxing@gmail.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: "Björn Töpel" <bjorn@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: netdev@vger.kernel.org
Signed-off-by: Harry Yoo (Meta) <harry@kernel.org>
---
 net/core/skbuff.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 966af3beed94..34ebbaf04fc7 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5213,7 +5213,7 @@ void __init skb_init(void)
 					      sizeof(struct sk_buff),
 					      0,
 					      SLAB_HWCACHE_ALIGN|SLAB_PANIC|
-						FLAG_SKB_NO_MERGE,
+						SLAB_MAY_ACCOUNT|FLAG_SKB_NO_MERGE,
 					      offsetof(struct sk_buff, cb),
 					      sizeof_field(struct sk_buff, cb),
 					      NULL);

-- 
2.54.0