linux-kernel - Re: [PATCH net-next v4 10/10] net: netconsole: fix wrong warning

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Message-ID: <20241001083358.GJ1310185@kernel.org>
Date: Tue, 1 Oct 2024 09:33:58 +0100
From: Simon Horman <horms@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: kuba@...nel.org, davem@...emloft.net, edumazet@...gle.com,
	pabeni@...hat.com, Matthew Wood <thepacketgeek@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	davej@...emonkey.org.uk, max@...sevol.com
Subject: Re: [PATCH net-next v4 10/10] net: netconsole: fix wrong warning

On Mon, Sep 30, 2024 at 06:12:09AM -0700, Breno Leitao wrote:
> A warning is triggered when there is insufficient space in the buffer
> for userdata. However, this is not an issue since userdata will be sent
> in the next iteration.
> 
> Current warning message:
> 
>     ------------[ cut here ]------------
>      WARNING: CPU: 13 PID: 3013042 at drivers/net/netconsole.c:1122 write_ext_msg+0x3b6/0x3d0
>       ? write_ext_msg+0x3b6/0x3d0
>       console_flush_all+0x1e9/0x330
> 
> The code incorrectly issues a warning when this_chunk is zero, which is
> a valid scenario. The warning should only be triggered when this_chunk
> is negative.
> 
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> Fixes: 1ec9daf95093 ("net: netconsole: append userdata to fragmented netconsole messages")

Reviewed-by: Simon Horman <horms@...nel.org>