linux-kernel - Re: [RFC][PATCH 0/6] Use printk_safe context for TTY and UART port locks

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Date:   Wed, 20 Jun 2018 12:38:01 +0900
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
        Steven Rostedt <rostedt@...dmis.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-serial <linux-serial@...r.kernel.org>,
        SergeySenozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [RFC][PATCH 0/6] Use printk_safe context for TTY and UART port locks

On Wed, Jun 20, 2018 at 11:50 AM Sergey Senozhatsky
<sergey.senozhatsky.work@...il.com> wrote:
>
> It's not UART on its own that immediately calls into printk(), that would
> be trivial to fix, it's all those subsystems that serial console driver
> can call into.

We already have the whole PRINTK_SAFE_CONTEXT_MASK model that only
adds it to a secondary buffer if you get recursion.  Why isn't that
triggering? That's the whole point of it.

I absolutely do *not*  want to see any crazy changes to tty drivers.  No no no.

                   Linus