linux-kernel - Re: [RFC PATCH v4 0/9] printk: new ringbuffer implementation

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Date:   Fri, 6 Sep 2019 12:49:48 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        John Ogness <john.ogness@...utronix.de>,
        Andrea Parri <andrea.parri@...rulasolutions.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Brendan Higgins <brendanhiggins@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v4 0/9] printk: new ringbuffer implementation

On Fri, Sep 06, 2019 at 07:09:43PM +0900, Sergey Senozhatsky wrote:

> ---
> diff --git a/kernel/printk/printk_safe.c b/kernel/printk/printk_safe.c
> index 139c310049b1..9c73eb6259ce 100644
> --- a/kernel/printk/printk_safe.c
> +++ b/kernel/printk/printk_safe.c
> @@ -103,7 +103,10 @@ static __printf(2, 0) int printk_safe_log_store(struct printk_safe_seq_buf *s,
>         if (atomic_cmpxchg(&s->len, len, len + add) != len)
>                 goto again;
>  
> -       queue_flush_work(s);
> +       if (early_console)
> +               early_console->write(early_console, s->buffer + len, add);
> +       else
> +               queue_flush_work(s);
>         return add;
>  }

You've not been following along, that generates absolutely unreadable
garbage.