linux-kernel - Re: [PATCH] printk-formats.txt documentation update

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Date:	Fri, 10 Jun 2011 03:20:49 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andrew Murray <amurray@...data.com>
Cc:	joe@...ches.com, w.sang@...gutronix.de, geert@...ux-m68k.org,
	linux-embedded@...r.kernel.org, linux-kernel@...r.kernel.org,
	trivial@...nel.org, rdunlap@...otime.net, udknight@...il.com,
	Andrew Murray <amurray@...-data.co.uk>
Subject: Re: [PATCH] printk-formats.txt documentation update

2011-06-09 (목), 19:04 +0100, Andrew Murray:
> From: Andrew Murray <amurray@...-data.co.uk>
> 
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers.
> 
> Signed-off-by: Andrew Murray <amurray@...-data.co.uk>
> ---
>  Documentation/printk-formats.txt |  119 +++++++++++++++++++++++++++++++++++++-
>  1 files changed, 117 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
> index 1b5a5dd..69713d6 100644
> --- a/Documentation/printk-formats.txt
> +++ b/Documentation/printk-formats.txt
> @@ -9,7 +9,121 @@ If variable is of Type,		use printk format specifier:
>  		size_t			%zu or %zx
>  		ssize_t			%zd or %zx
>  
> -Raw pointer value SHOULD be printed with %p.
> +Raw pointer value SHOULD be printed with %p. The kernel supports
> +the following extended format specifiers for pointer types:
> +
> +Symbols/Function Pointers:
> +
> +	%pF	versatile_init+0x0/0x110
> +	%pf	versatile_init
> +	%pS	versatile_init+0x0/0x110
> +	%ps	versatile_init
> +	%pB	versatile_init+0x0/0x110
> +

-EBADEXAMPLE :)

If %pB is used, the offset part in the output could not be 0. That's the
key (and the only) difference of the %pB specifier than others. Thus the
output would be something like:

	%pB	prev_fn_of_versatile_init+0x88/0x88

Thanks.


-- 
Regards,
Namhyung Kim


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