linux-kernel - Re: [PATCH RFC net-next v3 1/8] netconsole: consolidate send buffers into netconsole

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Message-ID: <20250128161128.GB277827@kernel.org>
Date: Tue, 28 Jan 2025 16:11:28 +0000
From: Simon Horman <horms@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
	rdunlap@...radead.org, kernel-team@...a.com
Subject: Re: [PATCH RFC net-next v3 1/8] netconsole: consolidate send buffers
 into netconsole_target struct

On Fri, Jan 24, 2025 at 07:16:40AM -0800, Breno Leitao wrote:
> Move the static buffers from send_msg_no_fragmentation() and
> send_msg_fragmented() into the netconsole_target structure. This
> simplifies the code by:
> - Eliminating redundant static buffers
> - Centralizing buffer management in the target structure
> - Reducing memory usage by 1KB (one buffer instead of two)
> 
> The buffer in netconsole_target is protected by target_list_lock,
> maintaining the same synchronization semantics as the original code.
> 
> Suggested-by: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> ---
>  drivers/net/netconsole.c | 29 +++++++++++++++--------------
>  1 file changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
> index 86ab4a42769a49eebe5dd6f01dafafc6c86ec54f..1a78704681184673f5c1ba8ae665e46751384293 100644
> --- a/drivers/net/netconsole.c
> +++ b/drivers/net/netconsole.c
> @@ -137,6 +137,8 @@ struct netconsole_target {
>  	bool			extended;
>  	bool			release;
>  	struct netpoll		np;
> +	/* protected by target_list_lock */
> +	char			buf[MAX_PRINT_CHUNK];

nit: buf should also be added to the Kernel doc for this structure.

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