linux-kernel - Re: [PATCH] netconsole: Append kernel version to message

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Message-ID: <4b2746ad-1835-43e6-a2fc-7063735daa46@lunn.ch>
Date:   Mon, 3 Jul 2023 18:46:25 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     leitao@...ian.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, sergey.senozhatsky@...il.com,
        pmladek@...e.com, tj@...nel.or,
        Dave Jones <davej@...emonkey.org.uk>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] netconsole: Append kernel version to message

> 
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> Cc: Dave Jones <davej@...emonkey.org.uk>

Signed-off-by should come last.

> +#ifdef CONFIG_NETCONSOLE_UNAME
> +static void send_ext_msg_udp_uname(struct netconsole_target *nt,
> +				   const char *msg, unsigned int len)
> +{
> +	unsigned int newlen;
> +	char *newmsg;
> +	char *uname;
> +
> +	uname = init_utsname()->release;
> +
> +	newmsg = kasprintf(GFP_KERNEL, "%s;%s", uname, msg);
> +	if (!newmsg)
> +		/* In case of ENOMEM, just ignore this entry */
> +		return;

Hi Breno

Why not just send the message without uname appended. You probably
want to see the OOM messages...

Also, what context are we in here? Should that be GFP_ATOMIC, which
net/core/netpoll.c is using to allocate the skbs?

> +static inline void send_msg_udp(struct netconsole_target *nt,
> +				const char *msg, unsigned int len)
> +{
> +#ifdef CONFIG_NETCONSOLE_UNAME
> +	send_ext_msg_udp_uname(nt, msg, len);
> +#else
> +	send_ext_msg_udp(nt, msg, len);
> +#endif

Please use

if (IS_ENABLED(CONFIG_NETCONSOLE_UNAME)) {} else {}

so the code is compiled and then thrown away. That nakes build testing
more efficient.

     Andrew