On Sun, Feb 6, 2011 at 01:15, Andrew Murray <[email protected]> wrote:
> From: Andrew Murray <[email protected]>
>
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers.
>
> Signed-off-by: Andrew Murray <[email protected]>
> ---
> diff --git a/Documentation/printk-formats.txt
> b/Documentation/printk-formats.txt
> index 1b5a5dd..df14336 100644
> --- a/Documentation/printk-formats.txt
> +++ b/Documentation/printk-formats.txt
> @@ -9,7 +9,42 @@ 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:
> +
> + General:
> +
> + %pF function pointer with offset, e.g. module_start
> + %pf function pointer without offset, e.g. module_start+0x0/0x62
> [hello]
> + %pS text symbol with offset
> + %ps text symbol without offset
> + %pR struct resource with decoded flags, e.g. [mem 0x0-0x1f 64 bit
> pref]
> + %pr struct resource with raw flags, e.g. [mem 0x0-0x1f flags
> 0x201]
> +
> + MAC/FDDI addresses:
> +
> + %pM colon-seperated 6-byte MAC address in hex notation, e.g.
> 00:01:02:03:04:05
> + %pm non-colon-seperated 6-byte MAC address is hex notation, e.g.
> 000102030405
> + %pMF 6-byte dash-separated FDDI hex notation
> +
> + IPv4 addresses:
> +
> + %pI4 IPv4 dot-seperated decimal without leading 0's, e.g. 1.2.3.4
> + %pi4 IPv4 dot-seperated decimal with leading 0's, 001.002.003.004
> + %p[Ii]4[hl] IPv4 dot-seperated decimal with/without leading 0's for
> + host (h), little (l) or network/big (default) endian order
> +
> + IPv6 addresses:
> + %pI6 IPv6 colon-seperated network-order 16 bit hex with leading
> 0's,
> + e.g. 0001:0203:...:0708
> + %pi6 IPv6 non-colon-seperated network-order 16 bit hex with
> leading 0's,
> + e.g. 000102...0f
> + %pI6c IPv6 address as described by
> +
> http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00,
> + e.g. 1::708
> +
> + %pU[bBlL] 16 byte UUID/GUID in big or little endian using lower or
> upper case
> +
In the mean time, we also got %pV and %pK. Can you please add them as well? Thx!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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