linux-kernel - Re: [PATCH v7 09/13] lib/vsprintf: Add a note on re-using %pf or %pF

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Message-ID: <20190918100023.078e3b8e@gandalf.local.home>
Date:   Wed, 18 Sep 2019 10:00:23 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Petr Mladek <pmladek@...e.com>, linux-kernel@...r.kernel.org,
        rafael@...nel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-acpi@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v7 09/13] lib/vsprintf: Add a note on re-using %pf or
 %pF

On Wed, 18 Sep 2019 16:34:15 +0300
Sakari Ailus <sakari.ailus@...ux.intel.com> wrote:

> Add a note warning of re-use of obsolete %pf or %pF extensions.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>

Suggested-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

> ---
>  lib/vsprintf.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> index b00b57f9f911f..df59818537b52 100644
> --- a/lib/vsprintf.c
> +++ b/lib/vsprintf.c
> @@ -2008,6 +2008,8 @@ static char *kobject_string(char *buf, char *end, void *ptr,
>   * - 'S' For symbolic direct pointers (or function descriptors) with offset
>   * - 's' For symbolic direct pointers (or function descriptors) without offset
>   * - '[Ss]R' as above with __builtin_extract_return_addr() translation
> + * - '[Ff]' Obsolete an now unsupported extension for printing direct pointers

 "Obsolete and now"?

-- Steve

> + *	    or function descriptors. Be careful when re-using %pf or %pF!
>   * - 'B' For backtraced symbolic direct pointers with offset
>   * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref]
>   * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201]