linux-kernel - Re: [RFC][PATCHv3 1/6] printk: use vprintk

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Date:   Tue, 18 Oct 2016 12:49:05 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:     Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, Tejun Heo <tj@...nel.org>,
        Calvin Owens <calvinowens@...com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [RFC][PATCHv3 1/6] printk: use vprintk_func in vprintk()

On Wed, 19 Oct 2016 00:40:40 +0900
Sergey Senozhatsky <sergey.senozhatsky@...il.com> wrote:

> vprintk(), just like printk(), better be using per-cpu printk_func
> instead of direct vprintk_emit() call. Just in case if vprintk()
> will ever be called from NMI, or from any other context that can
> deadlock in printk().
> 
> Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

Reviewed-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> ---
>  kernel/printk/printk.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index d5e3973..be7f60b 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -1917,7 +1917,7 @@ EXPORT_SYMBOL(vprintk_emit);
>  
>  asmlinkage int vprintk(const char *fmt, va_list args)
>  {
> -	return vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, 0, fmt, args);
> +	return vprintk_func(fmt, args);
>  }
>  EXPORT_SYMBOL(vprintk);
>