linux-kernel - Re: [PATCH] printk: make printk.synchronous param rw

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Message-ID: <20160426141553.GJ2749@pathway.suse.cz>
Date:	Tue, 26 Apr 2016 16:15:53 +0200
From:	Petr Mladek <pmladek@...e.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.com>, Tejun Heo <tj@...nel.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	linux-kernel@...r.kernel.org,
	Byungchul Park <byungchul.park@....com>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [PATCH] printk: make printk.synchronous param rw

On Sun 2016-04-24 00:01:05, Sergey Senozhatsky wrote:
> Change `synchronous' printk param to be RW, so user space
> can change printk mode back and forth to/from sync mode
> (which is considered to be more reliable).
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Reviewed-by: Jan Kara <jack@...e.cz>
> ---
> 
> -- added Jan's Reviewed-by
> -- factored out async printk checks to can_printk_async()
> 
>  kernel/printk/printk.c | 56 ++++++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 45 insertions(+), 11 deletions(-)
> 
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index 89f5441..9345a29 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -2757,6 +2759,13 @@ static int __init printk_late_init(void)
>  late_initcall(printk_late_init);
>  
>  #if defined CONFIG_PRINTK
> +/*
> + * Prevent starting printk_kthread from start_kernel()->parse_args().
> + * It's not possible at this stage. Instead, do it via the inticall
                                                              ^^^^^^^^

s/inticall/initcall/

Otherwise, it looks fine. I like the series and keep my fingers
crossed.

Reviewed-by: Petr Mladek <pmladek@...e.com>

Best Regards,
Petr