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Message-ID: <87zfva87xb.fsf@jogness.linutronix.de> Date: Thu, 07 Mar 2024 14:59:36 +0106 From: John Ogness <john.ogness@...utronix.de> To: Sreenath Vijayan <sreenath.vijayan@...y.com>, pmladek@...e.com, corbet@....net, gregkh@...uxfoundation.org, jirislaby@...nel.org Cc: rdunlap@...radead.org, rostedt@...dmis.org, senozhatsky@...omium.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, taichi.shimoyashiki@...y.com, daniel.palmer@...y.com, anandakumar.balasubramaniam@...y.com, sreenath.vijayan@...y.com Subject: Re: [PATCH v5 1/2] printk: Add function to replay kernel log on consoles On 2024-03-07, Sreenath Vijayan <sreenath.vijayan@...y.com> wrote: > Add a generic function console_replay_all() for replaying > the kernel log on consoles, in any context. It would allow > viewing the logs on an unresponsive terminal via sysrq. > > Reuse the existing code from console_flush_on_panic() for > resetting the sequence numbers, by introducing a new helper > function __console_rewind_all(). It is safe to be called > under console_lock(). > > Try to acquire lock on the console subsystem without waiting. > If successful, reset the sequence number to oldest available > record on all consoles and call console_unlock() which will > automatically flush the messages to the consoles. > > Suggested-by: John Ogness <john.ogness@...utronix.de> > Suggested-by: Petr Mladek <pmladek@...e.com> > Signed-off-by: Sreenath Vijayan <sreenath.vijayan@...y.com> > Signed-off-by: Shimoyashiki Taichi <taichi.shimoyashiki@...y.com> Reviewed-by: John Ogness <john.ogness@...utronix.de>
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