linux-kernel - Re: [PATCH 5.10-rt] printk: fix suppressed message print when reboot/panic

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Date:   Mon, 11 Jul 2022 12:31:28 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Schspa Shi <schspa@...il.com>, pmladek@...e.com,
        sergey.senozhatsky@...il.com, linux-rt-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, bigeasy@...utronix.de,
        tglx@...utronix.de, "Luis Claudio R. Goncalves" <lclaudio@...g.org>
Subject: Re: [PATCH 5.10-rt] printk: fix suppressed message print when
 reboot/panic


Luis,

Care to add this patch into the 5.10-rt stable?

Thanks,

-- Steve

On Mon, 21 Mar 2022 10:36:55 +0106
John Ogness <john.ogness@...utronix.de> wrote:

> On 2022-03-21, Schspa Shi <schspa@...il.com> wrote:
> > Update printk_seq for suppressed message.
> >
> > Affects 5.9-rt and 5.10-rt
> >
> > When message is suppressed, printk_seq should be updated, otherwise
> > this message will be printed when reboot. This problem was introduced
> > in commit 3edc0c85d154 ("printk: Rebase on top of new ring buffer").
> >
> > Signed-off-by: Schspa Shi <schspa@...il.com>  
> 
> Reviewed-by: John Ogness <john.ogness@...utronix.de>
> 
> Nice catch. Thanks.
> 
> 5.15-rt also has this issue, although the fix is slightly different. For
> 5.15-rt, writing to con->printk_seq (via latched_seq_write()) requires
> the console locked. Would you like to post a patch for 5.15-rt as well,
> or would you like me to do it?
> 
> 5.16 and beyond does not have this issue.
> 
> John Ogness