linux-kernel - Re: [PATCH net-next v10 1/2] net: af_packet: remove last_kactive_blk

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Message-ID: <willemdebruijn.kernel.320d357b92e75@gmail.com>
Date: Sun, 31 Aug 2025 21:18:08 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Xin Zhao <jackzxcui1989@....com>, 
 willemdebruijn.kernel@...il.com, 
 edumazet@...gle.com, 
 ferenc@...es.dev
Cc: davem@...emloft.net, 
 kuba@...nel.org, 
 pabeni@...hat.com, 
 horms@...nel.org, 
 netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Xin Zhao <jackzxcui1989@....com>
Subject: Re: [PATCH net-next v10 1/2] net: af_packet: remove
 last_kactive_blk_num field

Xin Zhao wrote:
> kactive_blk_num (K) is incremented on block close. last_kactive_blk_num (L)
> is set to match K on block open and each timer. So the only time that they
> differ is if a block is closed in tpacket_rcv and no new block could be
> opened.
> So the origin check L==K in timer callback only skip the case 'no new block
> to open'. If we remove L==K check, it will make prb_curr_blk_in_use check
> earlier, which will not cause any side effect.
> 
> Signed-off-by: Xin Zhao <jackzxcui1989@....com>

Reviewed-by: Willem de Bruijn <willemb@...gle.com>