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Date:   Fri, 6 Sep 2019 12:49:48 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc:     Petr Mladek <pmladek@suse.com>,
        John Ogness <john.ogness@linutronix.de>,
        Andrea Parri <andrea.parri@amarulasolutions.com>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Brendan Higgins <brendanhiggins@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v4 0/9] printk: new ringbuffer implementation
Message-ID: <20190906104948.GX2349@hirez.programming.kicks-ass.net>
References: <20190807222634.1723-1-john.ogness@linutronix.de>
 <20190904123531.GA2369@hirez.programming.kicks-ass.net>
 <20190905130513.4fru6yvjx73pjx7p@pathway.suse.cz>
 <20190905143118.GP2349@hirez.programming.kicks-ass.net>
 <20190906090627.GX2386@hirez.programming.kicks-ass.net>
 <20190906100943.GB10876@jagdpanzerIV>
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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.