linux-kernel - Re: [PATCH] tty: use printk_safe context at tty

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Date:   Tue, 6 Apr 2021 09:10:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Jiri Slaby <jirislaby@...nel.org>, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: use printk_safe context at tty_msg()

On Tue, Apr 06, 2021 at 02:31:43PM +0900, Tetsuo Handa wrote:
> On 2021/04/06 13:51, Jiri Slaby wrote:
> > On 03. 04. 21, 6:14, Tetsuo Handa wrote:
> >> --- a/include/linux/tty.h
> >> +++ b/include/linux/tty.h
> >> @@ -14,6 +14,7 @@
> >>   #include <uapi/linux/tty.h>
> >>   #include <linux/rwsem.h>
> >>   #include <linux/llist.h>
> >> +#include <../../kernel/printk/internal.h>
> > 
> > Including printk's internal header in linux/tty.h doesn't look correct to me.
> > 
> 
> This is because this patch wants __printk_safe_enter()/__printk_safe_exit()
> without #ifdef'ing CONFIG_PRINTK.

Then those functions need to be "properly" exported, not placed only in
an "internal.h" file that obviously should not be included from anywhere
like this.

> Peter and Sergey, what should we do?
> Can we move printk_safe_enter_irqsave()/printk_safe_exit_irqrestore() to include/linux/printk.h ?

Are you sure that is the only way to resolve this?

thanks,

greg k-h