linux-kernel - Re: [PATCH v5] printk: Userspace format enumeration support

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Message-ID: <YFSOeTrGXBzUkfml@alley>
Date:   Fri, 19 Mar 2021 12:43:53 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Chris Down <chris@...isdown.name>, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        John Ogness <john.ogness@...utronix.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>, kernel-team@...com
Subject: Re: [PATCH v5] printk: Userspace format enumeration support

On Thu 2021-03-18 12:31:44, Rasmus Villemoes wrote:
> On 18/03/2021 11.46, Petr Mladek wrote:
> 
> > BTW: Is the trick with int (printk)(const char *s, ...) documented
> > somewhere? Is it portable?
> 
> It is completely standard and portable C, explicitly spelled out in the
> C standard itself. C99:

Thanks a lot for the detailed info.

I still prefer to avoid using this "trick". But I am not going to
block it if more people would prefer it.

Best Regards,
Petr