[PATCH] printk-formats.txt documentation update

[PATCH] printk-formats.txt documentation update

[Andrew Murray]

From: Andrew Murray <amurray@mpc-data.co.uk>

This patch updates the incomplete documentation concerning the printk
extended format specifiers.

Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
---
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
+

 u64 SHOULD be printed with %llu/%llx, (unsigned long long):

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

[Tim Bird]

On 02/05/2011 04:15 PM, Andrew Murray wrote:
> From: Andrew Murray <amurray@mpc-data.co.uk>
> 
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers.
> 
> Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
> ---
> 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
> +
> 
>  u64 SHOULD be printed with %llu/%llx, (unsigned long long):

I like this, as it has information that is not documented elsewhere.

Some feedback on the patch:

Some of these lines are longer than 80 chars.  Can you please truncate
things to fit in an 80-column terminal window?

Thanks,
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Network Entertainment
=============================

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

[Joe Perches]

On Sun, 2011-02-06 at 00:15 +0000, Andrew Murray wrote:
> From: Andrew Murray <amurray@mpc-data.co.uk>
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers.
> Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
> ---
> diff --git 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:

I think it'd be better if each extension were individually described
with an example output.

> +
> +	General:
> +
> +	%pF	function pointer with offset, e.g. module_start
> +	%pf	function pointer without offset, e.g. module_start+0x0/0x62 [hello]

with/without inversion?

> +	%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

spelling: separated

> +	%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

Maybe a simple 2 line table without the e.g.:

	%p<extension1>	sample output1
			description1
	%p<extension2>	sample output2
			description2
	

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

[Andrew Murray]

Thanks for the feedback - I will truncate to 80 characters and
implement Joe's advice.

Thanks,

Andrew Murray

On 6 February 2011 00:37, Joe Perches <joe@perches.com> wrote:
> On Sun, 2011-02-06 at 00:15 +0000, Andrew Murray wrote:
>> From: Andrew Murray <amurray@mpc-data.co.uk>
>> This patch updates the incomplete documentation concerning the printk
>> extended format specifiers.
>> Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
>> ---
>> diff --git 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:
>
> I think it'd be better if each extension were individually described
> with an example output.
>
>> +
>> +     General:
>> +
>> +     %pF     function pointer with offset, e.g. module_start
>> +     %pf     function pointer without offset, e.g. module_start+0x0/0x62 [hello]
>
> with/without inversion?
>
>> +     %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
>
> spelling: separated
>
>> +     %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
>
> Maybe a simple 2 line table without the e.g.:
>
>        %p<extension1>  sample output1
>                        description1
>        %p<extension2>  sample output2
>                        description2
>
>
>



-- 
Andrew Murray, Embedded Linux Group
MPC Data Limited
e-mail: amurray@mpc-data.co.uk  web: www.mpc-data.co.uk
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Re: [PATCH] printk-formats.txt documentation update

[Geert Uytterhoeven]

On Sun, Feb 6, 2011 at 01:15, Andrew Murray <amurray@mpcdata.com> wrote:
> From: Andrew Murray <amurray@mpc-data.co.uk>
>
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers.
>
> Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
> ---
> 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 -- geert@linux-m68k.org

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

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

[Andrew Murray]

On 6 February 2011 10:16, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> In the mean time, we also got %pV and %pK. Can you please add them as well? Thx!

Ok how about this revised patch?

From: Andrew Murray <amurray@mpc-data.co.uk>

This patch updates the incomplete documentation concerning the printk
extended format specifiers.

Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
---
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 1b5a5dd..cad0dda 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -1,4 +1,4 @@
-If variable is of Type,		use printk format specifier:
+f variable is of Type,		use printk format specifier:
 ---------------------------------------------------------
 		int			%d or %x
 		unsigned int		%u or %x
@@ -9,7 +9,111 @@ 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
+
+	For printing symbols and function pointers. The 'S' and 's' specifiers
+	result in the symbol name with ('S') or without ('s') offsets. Where
+	this is used on a kernel without KALLSYMS - the symbol address is
+	printed instead.
+
+	On ia64, ppc64 and parisc64 architectures function pointers are
+	actually function descriptors which must first be resolved. The 'F' and
+	'f' specifiers perform this resolution and then provide the same
+	functionality as the 'S' and 's' specifiers.
+
+Kernel Pointers:
+
+	%pK	0x0
+
+	For printing kernel pointers which should be hidden from unprivileged
+	users. The behaviour of %pK depends on the kptr_resrict sysctl - see
+	Documentation/sysctl/kernel.txt for more details.
+
+Struct Resources:
+
+	%pr	[mem 0x60000000-0x6fffffff flags 0x2200]
+	%pR	[mem 0x60000000-0x6fffffff pref]
+
+	For printing struct resources. The 'R' and 'r' specifiers result in a
+	printed resource with ('R') or without ('r') a decoded flags member.
+
+MAC/FDDI addresses:
+
+	%pM	00:01:02:03:04:05
+	%pMF	00-01-02-03-04-05
+	%pm	000102030405
+
+	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
+	specifiers result in a printed address with ('M') or without ('m') byte
+	seperators. The default byte seperator is the colon (':').
+
+	Where FDDI addresses are concerned the 'F' specifier can be used after
+	the 'M' specifier to use dash ('-') seperators instead of the default
+	seperator.
+
+IPv4 addresses:
+
+	%pI4	1.2.3.4
+	%pi4	001.002.003.004
+	%p[Ii][hnbl]
+	
+	For printing IPv4 dot-seperated decminal addresses. The 'I4' and 'i4'
+	specifiers result in a printed address with ('i4') or without ('I4')
+	leading zeros.
+
+	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
+	host, network, big or little endian order addresses respectively. Where
+	no specifier is provided the default network/big endian order is used.
+
+IPv6 addresses:
+
+	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
+	%pi6	00010002000300040005000600070008
+	%pI6c	1:2:3:4:5:6:7:8
+
+	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'
+	specifiers result in a printed address with ('I6') or without ('i6')
+	colon-seperaters. Leading zeros are always used.
+
+	The additional 'c' specifier can be used with the 'I' specifier to
+	print a compressed IPv6 address as described by
+	http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00.
+
+UUID/GUID addresses:
+
+	%pU	00010203-0506-0708-090a-0b0c0d0e0fff
+	%pU[bBlL]
+
+	For printing 16 byte UUID/GUIDs addresses. The additional 'l', 'L',
+	'b' and 'B' specifiers are used to specifiy a little endian order in
+	lower ('l') or upper case ('L') hex characters - and big endian order
+	in lower ('b') or upper case ('B') hex characters.
+
+	Where no additional specifiers are used the default little endian
+	order with lower case hex characters will be printed.
+
+struct va_format:
+
+	%pV	
+
+	For printing struct va_format structures. These contain a format string
+	and va_list as follows:
+
+	struct va_format {
+		const char *fmt;
+		va_lost *va;
+	};
+
+	Do not use this feature without some mechanism to verify the
+	correctness of the format string and va_list arguments.

 u64 SHOULD be printed with %llu/%llx, (unsigned long long):

@@ -32,4 +136,5 @@ Reminder: sizeof() result is of type size_t.
 Thank you for your cooperation and attention.


-By Randy Dunlap <rdunlap@xenotime.net>
+By Randy Dunlap <rdunlap@xenotime.net> and
+Andrew Murray <amurray@mpc-data.co.uk>

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

[Andrew Murray]

On 6 February 2011 16:14, Andrew Murray <amurray@mpcdata.com> wrote:
> On 6 February 2011 10:16, Geert Uytterhoeven <geert@linux-m68k.org> wrote:
>> In the mean time, we also got %pV and %pK. Can you please add them as well? Thx!
>
> Ok how about this revised patch?
>
I've just noticed a zillion spelling mistakes - find below another
revised patch.

From: Andrew Murray <amurray@mpc-data.co.uk>

This patch updates the incomplete documentation concerning the printk
extended format specifiers.

Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
---
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 1b5a5dd..cad0dda 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -1,4 +1,4 @@
-If variable is of Type,		use printk format specifier:
+f variable is of Type,		use printk format specifier:
 ---------------------------------------------------------
 		int			%d or %x
 		unsigned int		%u or %x
@@ -9,7 +9,111 @@ 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
+
+	For printing symbols and function pointers. The 'S' and 's' specifiers
+	result in the symbol name with ('S') or without ('s') offsets. Where
+	this is used on a kernel without KALLSYMS - the symbol address is
+	printed instead.
+
+	On ia64, ppc64 and parisc64 architectures function pointers are
+	actually function descriptors which must first be resolved. The 'F' and
+	'f' specifiers perform this resolution and then provide the same
+	functionality as the 'S' and 's' specifiers.
+
+Kernel Pointers:
+
+	%pK	0x0
+
+	For printing kernel pointers which should be hidden from unprivileged
+	users. The behaviour of %pK depends on the kptr_resrict sysctl - see
+	Documentation/sysctl/kernel.txt for more details.
+
+Struct Resources:
+
+	%pr	[mem 0x60000000-0x6fffffff flags 0x2200]
+	%pR	[mem 0x60000000-0x6fffffff pref]
+
+	For printing struct resources. The 'R' and 'r' specifiers result in a
+	printed resource with ('R') or without ('r') a decoded flags member.
+
+MAC/FDDI addresses:
+
+	%pM	00:01:02:03:04:05
+	%pMF	00-01-02-03-04-05
+	%pm	000102030405
+
+	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
+	specifiers result in a printed address with ('M') or without ('m') byte
+	separators. The default byte separator is the colon (':').
+
+	Where FDDI addresses are concerned the 'F' specifier can be used after
+	the 'M' specifier to use dash ('-') separators instead of the default
+	separator.
+
+IPv4 addresses:
+
+	%pI4	1.2.3.4
+	%pi4	001.002.003.004
+	%p[Ii][hnbl]
+	
+	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
+	specifiers result in a printed address with ('i4') or without ('I4')
+	leading zeros.
+
+	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
+	host, network, big or little endian order addresses respectively. Where
+	no specifier is provided the default network/big endian order is used.
+
+IPv6 addresses:
+
+	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
+	%pi6	00010002000300040005000600070008
+	%pI6c	1:2:3:4:5:6:7:8
+
+	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'
+	specifiers result in a printed address with ('I6') or without ('i6')
+	colon-separators. Leading zeros are always used.
+
+	The additional 'c' specifier can be used with the 'I' specifier to
+	print a compressed IPv6 address as described by
+	http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00.
+
+UUID/GUID addresses:
+
+	%pU	00010203-0506-0708-090a-0b0c0d0e0fff
+	%pU[bBlL]
+
+	For printing 16 byte UUID/GUIDs addresses. The additional 'l', 'L',
+	'b' and 'B' specifiers are used to specify a little endian order in
+	lower ('l') or upper case ('L') hex characters - and big endian order
+	in lower ('b') or upper case ('B') hex characters.
+
+	Where no additional specifiers are used the default little endian
+	order with lower case hex characters will be printed.
+
+struct va_format:
+
+	%pV	
+
+	For printing struct va_format structures. These contain a format string
+	and va_list as follows:
+
+	struct va_format {
+		const char *fmt;
+		va_lost *va;
+	};
+
+	Do not use this feature without some mechanism to verify the
+	correctness of the format string and va_list arguments.

 u64 SHOULD be printed with %llu/%llx, (unsigned long long):

@@ -32,4 +136,5 @@ Reminder: sizeof() result is of type size_t.
 Thank you for your cooperation and attention.


-By Randy Dunlap <rdunlap@xenotime.net>
+By Randy Dunlap <rdunlap@xenotime.net> and
+Andrew Murray <amurray@mpc-data.co.uk>

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

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 727 bytes --]

On Sun, Feb 06, 2011 at 04:23:09PM +0000, Andrew Murray wrote:
> On 6 February 2011 16:14, Andrew Murray <amurray@mpcdata.com> wrote:
> From: Andrew Murray <amurray@mpc-data.co.uk>
> 
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers.

Good one, thanks!

> +Kernel Pointers:
> +
> +	%pK	0x0
> +
> +	For printing kernel pointers which should be hidden from unprivileged
> +	users. The behaviour of %pK depends on the kptr_resrict sysctl - see

Typo: Should be kptr_restrict.

Regards,

   Wolfram

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 198 bytes --]

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

[Andrew Murray]

On 7 February 2011 09:29, Wolfram Sang <w.sang@pengutronix.de> wrote:
> On Sun, Feb 06, 2011 at 04:23:09PM +0000, Andrew Murray wrote:
>> +
>> +     For printing kernel pointers which should be hidden from unprivileged
>> +     users. The behaviour of %pK depends on the kptr_resrict sysctl - see
>
> Typo: Should be kptr_restrict.

Updated patch:

From: Andrew Murray <amurray@mpc-data.co.uk>

This patch updates the incomplete documentation concerning the printk
extended format specifiers.

Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
---
diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 1b5a5dd..cad0dda 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -1,4 +1,4 @@
-If variable is of Type,		use printk format specifier:
+f variable is of Type,		use printk format specifier:
 ---------------------------------------------------------
 		int			%d or %x
 		unsigned int		%u or %x
@@ -9,7 +9,111 @@ 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
+
+	For printing symbols and function pointers. The 'S' and 's' specifiers
+	result in the symbol name with ('S') or without ('s') offsets. Where
+	this is used on a kernel without KALLSYMS - the symbol address is
+	printed instead.
+
+	On ia64, ppc64 and parisc64 architectures function pointers are
+	actually function descriptors which must first be resolved. The 'F' and
+	'f' specifiers perform this resolution and then provide the same
+	functionality as the 'S' and 's' specifiers.
+
+Kernel Pointers:
+
+	%pK	0x0
+
+	For printing kernel pointers which should be hidden from unprivileged
+	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
+	Documentation/sysctl/kernel.txt for more details.
+
+Struct Resources:
+
+	%pr	[mem 0x60000000-0x6fffffff flags 0x2200]
+	%pR	[mem 0x60000000-0x6fffffff pref]
+
+	For printing struct resources. The 'R' and 'r' specifiers result in a
+	printed resource with ('R') or without ('r') a decoded flags member.
+
+MAC/FDDI addresses:
+
+	%pM	00:01:02:03:04:05
+	%pMF	00-01-02-03-04-05
+	%pm	000102030405
+
+	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
+	specifiers result in a printed address with ('M') or without ('m') byte
+	separators. The default byte separator is the colon (':').
+
+	Where FDDI addresses are concerned the 'F' specifier can be used after
+	the 'M' specifier to use dash ('-') separators instead of the default
+	separator.
+
+IPv4 addresses:
+
+	%pI4	1.2.3.4
+	%pi4	001.002.003.004
+	%p[Ii][hnbl]
+	
+	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
+	specifiers result in a printed address with ('i4') or without ('I4')
+	leading zeros.
+
+	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
+	host, network, big or little endian order addresses respectively. Where
+	no specifier is provided the default network/big endian order is used.
+
+IPv6 addresses:
+
+	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
+	%pi6	00010002000300040005000600070008
+	%pI6c	1:2:3:4:5:6:7:8
+
+	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'
+	specifiers result in a printed address with ('I6') or without ('i6')
+	colon-separators. Leading zeros are always used.
+
+	The additional 'c' specifier can be used with the 'I' specifier to
+	print a compressed IPv6 address as described by
+	http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00.
+
+UUID/GUID addresses:
+
+	%pU	00010203-0506-0708-090a-0b0c0d0e0fff
+	%pU[bBlL]
+
+	For printing 16 byte UUID/GUIDs addresses. The additional 'l', 'L',
+	'b' and 'B' specifiers are used to specify a little endian order in
+	lower ('l') or upper case ('L') hex characters - and big endian order
+	in lower ('b') or upper case ('B') hex characters.
+
+	Where no additional specifiers are used the default little endian
+	order with lower case hex characters will be printed.
+
+struct va_format:
+
+	%pV	
+
+	For printing struct va_format structures. These contain a format string
+	and va_list as follows:
+
+	struct va_format {
+		const char *fmt;
+		va_lost *va;
+	};
+
+	Do not use this feature without some mechanism to verify the
+	correctness of the format string and va_list arguments.

 u64 SHOULD be printed with %llu/%llx, (unsigned long long):

@@ -32,4 +136,5 @@ Reminder: sizeof() result is of type size_t.
 Thank you for your cooperation and attention.


-By Randy Dunlap <rdunlap@xenotime.net>
+By Randy Dunlap <rdunlap@xenotime.net> and
+Andrew Murray <amurray@mpc-data.co.uk>

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

[Joe Perches]

On Mon, 2011-02-07 at 18:12 +0000, Andrew Murray wrote:
> On 7 February 2011 09:29, Wolfram Sang <w.sang@pengutronix.de> wrote:
> > On Sun, Feb 06, 2011 at 04:23:09PM +0000, Andrew Murray wrote:
> >> +
> >> +     For printing kernel pointers which should be hidden from unprivileged
> >> +     users. The behaviour of %pK depends on the kptr_resrict sysctl - see
> >
> > Typo: Should be kptr_restrict.
> Updated patch:

trivia:

> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
[]
> +Kernel Pointers:
> +
> +	%pK	0x0

Bad example, leading zeros are emitted.

	%pK	0x01234567 or 0x01234567890abcdef

depending on 32/64 bit. For 2.6.38, output should be 0x00000000
for a 0 if kptr_restrict is set, "(null)" or value otherwise.

> +	For printing kernel pointers which should be hidden from unprivileged
> +	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
> +	Documentation/sysctl/kernel.txt for more details.
> +
> +Struct Resources:
> +
> +	%pr	[mem 0x60000000-0x6fffffff flags 0x2200]
> +	%pR	[mem 0x60000000-0x6fffffff pref]
> +
> +	For printing struct resources. The 'R' and 'r' specifiers result in a
> +	printed resource with ('R') or without ('r') a decoded flags member.

Same issue, mem resources are printed using sizeof(resource_size_t) * 2

> +IPv6 addresses:
> +
> +	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
> +	%pi6	00010002000300040005000600070008
> +	%pI6c	1:2:3:4:5:6:7:8
> +
> +	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'
> +	specifiers result in a printed address with ('I6') or without ('i6')
> +	colon-separators. Leading zeros are always used.
> +
> +	The additional 'c' specifier can be used with the 'I' specifier to
> +	print a compressed IPv6 address as described by
> +	http://tools.ietf.org/html/draft-ietf-6man-text-addr-representation-00.

It's probably better to use:

	http://tools.ietf.org/html/rfc5952

> +
> +UUID/GUID addresses:
> +
> +	%pU	00010203-0506-0708-090a-0b0c0d0e0fff

What happened to 04?

It's probably easier/simpler to just show all possible
output styles.  Assuming an in memory incrementing
16 byte array, output is:

	%pU	00010203-0405-0607-08090a0b0c0d0e0f
	
> +	%pU[bBlL]

	%pUb	00010203-0405-0607-08090a0b0c0d0e0f
	%pUB	00010203-0405-0607-08090A0B0C0D0E0F
	%pUl	03020100-0504-0706-08090a0b0c0d0e0f
	%pUL	03020100-0504-0706-08090A0B0E0D0E0F

> +	For printing 16 byte UUID/GUIDs addresses. The additional 'l', 'L',
> +	'b' and 'B' specifiers are used to specify a little endian order in
> +	lower ('l') or upper case ('L') hex characters - and big endian order
> +	in lower ('b') or upper case ('B') hex characters.
> +
> +	Where no additional specifiers are used the default little endian
> +	order with lower case hex characters will be printed.
> +
> +struct va_format:
> +
> +	%pV	
> +
> +	For printing struct va_format structures. These contain a format string
> +	and va_list as follows:
> +
> +	struct va_format {
> +		const char *fmt;
> +		va_lost *va;

va_list

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

[Andrew Murray]

On 7 February 2011 19:33, Joe Perches <joe@perches.com> wrote:
>
> On Mon, 2011-02-07 at 18:12 +0000, Andrew Murray wrote:
> > On 7 February 2011 09:29, Wolfram Sang <w.sang@pengutronix.de> wrote:
> > > On Sun, Feb 06, 2011 at 04:23:09PM +0000, Andrew Murray wrote:
> > >> +
>

Thanks for the feedback - I'll be on holiday shortly - so will have to
continue this when in return.

Andrew Murray

[PATCH] Revised patch

[Andrew Murray]

Hi,

I've updated this patch based on your feedback. This covers all the recent feedback.

From: Andrew Murray <amurray@mpc-data.co.uk>

This patch updates the incomplete documentation concerning the printk
extended format specifiers.

Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>

---
 Documentation/printk-formats.txt |  113 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 111 insertions(+), 2 deletions(-)

diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
index 1b5a5dd..2968cbf 100644
--- a/Documentation/printk-formats.txt
+++ b/Documentation/printk-formats.txt
@@ -9,7 +9,115 @@ 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
+
+	For printing symbols and function pointers. The 'S' and 's' specifiers
+	result in the symbol name with ('S') or without ('s') offsets. Where
+	this is used on a kernel without KALLSYMS - the symbol address is
+	printed instead.
+
+	On ia64, ppc64 and parisc64 architectures function pointers are
+	actually function descriptors which must first be resolved. The 'F' and
+	'f' specifiers perform this resolution and then provide the same
+	functionality as the 'S' and 's' specifiers.
+
+Kernel Pointers:
+
+	%pK	0x01234567 or 0x0123456789abcdef
+
+	For printing kernel pointers which should be hidden from unprivileged
+	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
+	Documentation/sysctl/kernel.txt for more details.
+
+Struct Resources:
+
+	%pr	[mem 0x60000000-0x6fffffff flags 0x2200] or
+		[mem 0x0000000060000000-0x000000006fffffff flags 0x2200]
+	%pR	[mem 0x60000000-0x6fffffff pref] or
+		[mem 0x0000000060000000-0x000000006fffffff pref]
+
+	For printing struct resources. The 'R' and 'r' specifiers result in a
+	printed resource with ('R') or without ('r') a decoded flags member.
+
+MAC/FDDI addresses:
+
+	%pM	00:01:02:03:04:05
+	%pMF	00-01-02-03-04-05
+	%pm	000102030405
+
+	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
+	specifiers result in a printed address with ('M') or without ('m') byte
+	separators. The default byte separator is the colon (':').
+
+	Where FDDI addresses are concerned the 'F' specifier can be used after
+	the 'M' specifier to use dash ('-') separators instead of the default
+	separator.
+
+IPv4 addresses:
+
+	%pI4	1.2.3.4
+	%pi4	001.002.003.004
+	%p[Ii][hnbl]
+	
+	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
+	specifiers result in a printed address with ('i4') or without ('I4')
+	leading zeros.
+
+	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
+	host, network, big or little endian order addresses respectively. Where
+	no specifier is provided the default network/big endian order is used.
+
+IPv6 addresses:
+
+	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
+	%pi6	00010002000300040005000600070008
+	%pI6c	1:2:3:4:5:6:7:8
+
+	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'
+	specifiers result in a printed address with ('I6') or without ('i6')
+	colon-separators. Leading zeros are always used.
+
+	The additional 'c' specifier can be used with the 'I' specifier to
+	print a compressed IPv6 address as described by
+	http://tools.ietf.org/html/rfc5952
+
+UUID/GUID addresses:
+
+	%pUb	00010203-0405-0607-0809-0a0b0c0d0e0f
+	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
+	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
+	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
+
+	For printing 16 byte UUID/GUIDs addresses. The additional 'l', 'L',
+	'b' and 'B' specifiers are used to specify a little endian order in
+	lower ('l') or upper case ('L') hex characters - and big endian order
+	in lower ('b') or upper case ('B') hex characters.
+
+	Where no additional specifiers are used the default little endian
+	order with lower case hex characters will be printed.
+
+struct va_format:
+
+	%pV	
+
+	For printing struct va_format structures. These contain a format string
+	and va_list as follows:
+
+	struct va_format {
+		const char *fmt;
+		va_list *va;
+	};
+
+	Do not use this feature without some mechanism to verify the
+	correctness of the format string and va_list arguments.
 
 u64 SHOULD be printed with %llu/%llx, (unsigned long long):
 
@@ -32,4 +140,5 @@ Reminder: sizeof() result is of type size_t.
 Thank you for your cooperation and attention.
 
 
-By Randy Dunlap <rdunlap@xenotime.net>
+By Randy Dunlap <rdunlap@xenotime.net> and
+Andrew Murray <amurray@mpc-data.co.uk>
-- 
1.7.4.1

Re: [PATCH] Revised patch

[Joe Perches]

On Thu, 2011-06-09 at 18:33 +0100, Andrew Murray wrote:
> Hi,
> I've updated this patch based on your feedback. This covers all the recent feedback.

Hey Andrew.

You're missing the "%pB" backtrace extension.

It's be better if the "Hi, I've updated" comment stuff
came after the --- content separator in the patch so that
the commit log is a bit neater.

Otherwise, looks great, thanks.

cheers, Joe

Re: [PATCH] Revised patch

[Namhyung Kim]

2011-06-09 (목), 10:40 -0700, Joe Perches:
> On Thu, 2011-06-09 at 18:33 +0100, Andrew Murray wrote:
> > Hi,
> > I've updated this patch based on your feedback. This covers all the recent feedback.
> 
> Hey Andrew.
> 
> You're missing the "%pB" backtrace extension.
> 

http://marc.info/?l=linux-kernel&m=130093458112438&w=2

Just for your information. :)
Thanks.


-- 
Regards,
Namhyung Kim

Re: [PATCH] Revised patch

[Andrew Murray]

Thanks - I've actually written the %pB documentation but just getting
in a mess with Git and my work flow - standby...

On 9 June 2011 18:47, Namhyung Kim <namhyung@gmail.com> wrote:
> 2011-06-09 (목), 10:40 -0700, Joe Perches:
>> On Thu, 2011-06-09 at 18:33 +0100, Andrew Murray wrote:
>> > Hi,
>> > I've updated this patch based on your feedback. This covers all the recent feedback.
>>
>> Hey Andrew.
>>
>> You're missing the "%pB" backtrace extension.
>>
>
> http://marc.info/?l=linux-kernel&m=130093458112438&w=2
>
> Just for your information. :)
> Thanks.
>
>
> --
> Regards,
> Namhyung Kim
>
>
>



-- 
Andrew Murray, Embedded Linux Group
MPC Data Limited
e-mail: amurray@mpc-data.co.uk  web: www.mpc-data.co.uk
tel: +44 (0) 1225 710600               fax: +44 (0) 1225 710601
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[PATCH] printk-formats.txt documentation update

[Andrew Murray]

From: Andrew Murray <amurray@mpc-data.co.uk>

This patch updates the incomplete documentation concerning the printk
extended format specifiers.

Signed-off-by: Andrew Murray <amurray@mpc-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
+
+	For printing symbols and function pointers. The 'S' and 's' specifiers
+	result in the symbol name with ('S') or without ('s') offsets. Where
+	this is used on a kernel without KALLSYMS - the symbol address is
+	printed instead.
+
+	The 'B' specifier results in the symbol name with offsets and should be
+	used when printing stack backtraces. The specifier takes into
+	consideration the effect of compiler optimisations which may occur
+	when tail-call's are used and marked with the noreturn GCC attribute.
+
+	On ia64, ppc64 and parisc64 architectures function pointers are
+	actually function descriptors which must first be resolved. The 'F' and
+	'f' specifiers perform this resolution and then provide the same
+	functionality as the 'S' and 's' specifiers.
+
+Kernel Pointers:
+
+	%pK	0x01234567 or 0x0123456789abcdef
+
+	For printing kernel pointers which should be hidden from unprivileged
+	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
+	Documentation/sysctl/kernel.txt for more details.
+
+Struct Resources:
+
+	%pr	[mem 0x60000000-0x6fffffff flags 0x2200] or
+		[mem 0x0000000060000000-0x000000006fffffff flags 0x2200]
+	%pR	[mem 0x60000000-0x6fffffff pref] or
+		[mem 0x0000000060000000-0x000000006fffffff pref]
+
+	For printing struct resources. The 'R' and 'r' specifiers result in a
+	printed resource with ('R') or without ('r') a decoded flags member.
+
+MAC/FDDI addresses:
+
+	%pM	00:01:02:03:04:05
+	%pMF	00-01-02-03-04-05
+	%pm	000102030405
+
+	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
+	specifiers result in a printed address with ('M') or without ('m') byte
+	separators. The default byte separator is the colon (':').
+
+	Where FDDI addresses are concerned the 'F' specifier can be used after
+	the 'M' specifier to use dash ('-') separators instead of the default
+	separator.
+
+IPv4 addresses:
+
+	%pI4	1.2.3.4
+	%pi4	001.002.003.004
+	%p[Ii][hnbl]
+	
+	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
+	specifiers result in a printed address with ('i4') or without ('I4')
+	leading zeros.
+
+	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
+	host, network, big or little endian order addresses respectively. Where
+	no specifier is provided the default network/big endian order is used.
+
+IPv6 addresses:
+
+	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
+	%pi6	00010002000300040005000600070008
+	%pI6c	1:2:3:4:5:6:7:8
+
+	For printing IPv6 network-order 16-bit hex addresses. The 'I6' and 'i6'
+	specifiers result in a printed address with ('I6') or without ('i6')
+	colon-separators. Leading zeros are always used.
+
+	The additional 'c' specifier can be used with the 'I' specifier to
+	print a compressed IPv6 address as described by
+	http://tools.ietf.org/html/rfc5952
+
+UUID/GUID addresses:
+
+	%pUb	00010203-0405-0607-0809-0a0b0c0d0e0f
+	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
+	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
+	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
+
+	For printing 16-byte UUID/GUIDs addresses. The additional 'l', 'L',
+	'b' and 'B' specifiers are used to specify a little endian order in
+	lower ('l') or upper case ('L') hex characters - and big endian order
+	in lower ('b') or upper case ('B') hex characters.
+
+	Where no additional specifiers are used the default little endian
+	order with lower case hex characters will be printed.
+
+struct va_format:
+
+	%pV	
+
+	For printing struct va_format structures. These contain a format string
+	and va_list as follows:
+
+	struct va_format {
+		const char *fmt;
+		va_list *va;
+	};
+
+	Do not use this feature without some mechanism to verify the
+	correctness of the format string and va_list arguments.
 
 u64 SHOULD be printed with %llu/%llx, (unsigned long long):
 
@@ -32,4 +146,5 @@ Reminder: sizeof() result is of type size_t.
 Thank you for your cooperation and attention.
 
 
-By Randy Dunlap <rdunlap@xenotime.net>
+By Randy Dunlap <rdunlap@xenotime.net> and
+Andrew Murray <amurray@mpc-data.co.uk>
-- 
1.7.4.1

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

[Namhyung Kim]

2011-06-09 (목), 19:04 +0100, Andrew Murray:
> From: Andrew Murray <amurray@mpc-data.co.uk>
> 
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers.
> 
> Signed-off-by: Andrew Murray <amurray@mpc-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

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

[Andrew Murray]

From: Andrew Murray <amurray@mpc-data.co.uk>

This patch updates the incomplete documentation concerning the printk
extended format specifiers

Signed-off-by: Andrew Murray <amurray@mpc-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..85a06aa 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	prev_fn_of_versatile_init+0x88/0x88
+
+	For printing symbols and function pointers. The 'S' and 's' specifiers
+	result in the symbol name with ('S') or without ('s') offsets. Where
+	this is used on a kernel without KALLSYMS - the symbol address is
+	printed instead.
+
+	The 'B' specifier results in the symbol name with offsets and should be
+	used when printing stack backtraces. The specifier takes into
+	consideration the effect of compiler optimisations which may occur
+	when tail-call's are used and marked with the noreturn GCC attribute.
+
+	On ia64, ppc64 and parisc64 architectures function pointers are
+	actually function descriptors which must first be resolved. The 'F' and
+	'f' specifiers perform this resolution and then provide the same
+	functionality as the 'S' and 's' specifiers.
+
+Kernel Pointers:
+
+	%pK	0x01234567 or 0x0123456789abcdef
+
+	For printing kernel pointers which should be hidden from unprivileged
+	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
+	Documentation/sysctl/kernel.txt for more details.
+
+Struct Resources:
+
+	%pr	[mem 0x60000000-0x6fffffff flags 0x2200] or
+		[mem 0x0000000060000000-0x000000006fffffff flags 0x2200]
+	%pR	[mem 0x60000000-0x6fffffff pref] or
+		[mem 0x0000000060000000-0x000000006fffffff pref]
+
+	For printing struct resources. The 'R' and 'r' specifiers result in a
+	printed resource with ('R') or without ('r') a decoded flags member.
+
+MAC/FDDI addresses:
+
+	%pM	00:01:02:03:04:05
+	%pMF	00-01-02-03-04-05
+	%pm	000102030405
+
+	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
+	specifiers result in a printed address with ('M') or without ('m') byte
+	separators. The default byte separator is the colon (':').
+
+	Where FDDI addresses are concerned the 'F' specifier can be used after
+	the 'M' specifier to use dash ('-') separators instead of the default
+	separator.
+
+IPv4 addresses:
+
+	%pI4	1.2.3.4
+	%pi4	001.002.003.004
+	%p[Ii][hnbl]
+	
+	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
+	specifiers result in a printed address with ('i4') or without ('I4')
+	leading zeros.
+
+	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
+	host, network, big or little endian order addresses respectively. Where
+	no specifier is provided the default network/big endian order is used.
+
+IPv6 addresses:
+
+	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
+	%pi6	00010002000300040005000600070008
+	%pI6c	1:2:3:4:5:6:7:8
+
+	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'
+	specifiers result in a printed address with ('I6') or without ('i6')
+	colon-separators. Leading zeros are always used.
+
+	The additional 'c' specifier can be used with the 'I' specifier to
+	print a compressed IPv6 address as described by
+	http://tools.ietf.org/html/rfc5952
+
+UUID/GUID addresses:
+
+	%pUb	00010203-0405-0607-0809-0a0b0c0d0e0f
+	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
+	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
+	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
+
+	For printing 16 byte UUID/GUIDs addresses. The additional 'l', 'L',
+	'b' and 'B' specifiers are used to specify a little endian order in
+	lower ('l') or upper case ('L') hex characters - and big endian order
+	in lower ('b') or upper case ('B') hex characters.
+
+	Where no additional specifiers are used the default little endian
+	order with lower case hex characters will be printed.
+
+struct va_format:
+
+	%pV	
+
+	For printing struct va_format structures. These contain a format string
+	and va_list as follows:
+
+	struct va_format {
+		const char *fmt;
+		va_list *va;
+	};
+
+	Do not use this feature without some mechanism to verify the
+	correctness of the format string and va_list arguments.
 
 u64 SHOULD be printed with %llu/%llx, (unsigned long long):
 
@@ -32,4 +146,5 @@ Reminder: sizeof() result is of type size_t.
 Thank you for your cooperation and attention.
 
 
-By Randy Dunlap <rdunlap@xenotime.net>
+By Randy Dunlap <rdunlap@xenotime.net> and
+Andrew Murray <amurray@mpc-data.co.uk>
-- 
1.7.4.1

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

[Randy Dunlap]

On Thu,  9 Jun 2011 19:55:35 +0100 Andrew Murray wrote:

> From: Andrew Murray <amurray@mpc-data.co.uk>
> 
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers
> 
> Signed-off-by: Andrew Murray <amurray@mpc-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..85a06aa 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	prev_fn_of_versatile_init+0x88/0x88
> +
> +	For printing symbols and function pointers. The 'S' and 's' specifiers
> +	result in the symbol name with ('S') or without ('s') offsets. Where
> +	this is used on a kernel without KALLSYMS - the symbol address is
> +	printed instead.
> +
> +	The 'B' specifier results in the symbol name with offsets and should be
> +	used when printing stack backtraces. The specifier takes into
> +	consideration the effect of compiler optimisations which may occur
> +	when tail-call's are used and marked with the noreturn GCC attribute.
> +
> +	On ia64, ppc64 and parisc64 architectures function pointers are
> +	actually function descriptors which must first be resolved. The 'F' and
> +	'f' specifiers perform this resolution and then provide the same
> +	functionality as the 'S' and 's' specifiers.
> +
> +Kernel Pointers:
> +
> +	%pK	0x01234567 or 0x0123456789abcdef
> +
> +	For printing kernel pointers which should be hidden from unprivileged
> +	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
> +	Documentation/sysctl/kernel.txt for more details.
> +
> +Struct Resources:
> +
> +	%pr	[mem 0x60000000-0x6fffffff flags 0x2200] or
> +		[mem 0x0000000060000000-0x000000006fffffff flags 0x2200]
> +	%pR	[mem 0x60000000-0x6fffffff pref] or
> +		[mem 0x0000000060000000-0x000000006fffffff pref]
> +
> +	For printing struct resources. The 'R' and 'r' specifiers result in a
> +	printed resource with ('R') or without ('r') a decoded flags member.
> +
> +MAC/FDDI addresses:
> +
> +	%pM	00:01:02:03:04:05
> +	%pMF	00-01-02-03-04-05
> +	%pm	000102030405
> +
> +	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
> +	specifiers result in a printed address with ('M') or without ('m') byte
> +	separators. The default byte separator is the colon (':').
> +
> +	Where FDDI addresses are concerned the 'F' specifier can be used after
> +	the 'M' specifier to use dash ('-') separators instead of the default
> +	separator.
> +
> +IPv4 addresses:
> +
> +	%pI4	1.2.3.4
> +	%pi4	001.002.003.004
> +	%p[Ii][hnbl]
> +	
> +	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
> +	specifiers result in a printed address with ('i4') or without ('I4')
> +	leading zeros.
> +
> +	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
> +	host, network, big or little endian order addresses respectively. Where
> +	no specifier is provided the default network/big endian order is used.
> +
> +IPv6 addresses:
> +
> +	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
> +	%pi6	00010002000300040005000600070008
> +	%pI6c	1:2:3:4:5:6:7:8
> +
> +	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'

You lost the hyphen in 16-bit.  The previous patch version had it... :(

> +	specifiers result in a printed address with ('I6') or without ('i6')
> +	colon-separators. Leading zeros are always used.
> +
> +	The additional 'c' specifier can be used with the 'I' specifier to
> +	print a compressed IPv6 address as described by
> +	http://tools.ietf.org/html/rfc5952
> +
> +UUID/GUID addresses:
> +
> +	%pUb	00010203-0405-0607-0809-0a0b0c0d0e0f
> +	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
> +	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
> +	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
> +
> +	For printing 16 byte UUID/GUIDs addresses. The additional 'l', 'L',

same for 16-byte

> +	'b' and 'B' specifiers are used to specify a little endian order in
> +	lower ('l') or upper case ('L') hex characters - and big endian order
> +	in lower ('b') or upper case ('B') hex characters.
> +
> +	Where no additional specifiers are used the default little endian
> +	order with lower case hex characters will be printed.
> +
> +struct va_format:
> +
> +	%pV	
> +
> +	For printing struct va_format structures. These contain a format string
> +	and va_list as follows:
> +
> +	struct va_format {
> +		const char *fmt;
> +		va_list *va;
> +	};
> +
> +	Do not use this feature without some mechanism to verify the
> +	correctness of the format string and va_list arguments.
>  
>  u64 SHOULD be printed with %llu/%llx, (unsigned long long):
>  
> @@ -32,4 +146,5 @@ Reminder: sizeof() result is of type size_t.
>  Thank you for your cooperation and attention.
>  
>  
> -By Randy Dunlap <rdunlap@xenotime.net>
> +By Randy Dunlap <rdunlap@xenotime.net> and
> +Andrew Murray <amurray@mpc-data.co.uk>
> -- 
> 1.7.4.1
> 


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

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

[Andrew Murray]

From: Andrew Murray <amurray@mpc-data.co.uk>

This patch updates the incomplete documentation concerning the printk
extended format specifiers

Signed-off-by: Andrew Murray <amurray@mpc-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..6455e5b 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	prev_fn_of_versatile_init+0x88/0x88
+
+	For printing symbols and function pointers. The 'S' and 's' specifiers
+	result in the symbol name with ('S') or without ('s') offsets. Where
+	this is used on a kernel without KALLSYMS - the symbol address is
+	printed instead.
+
+	The 'B' specifier results in the symbol name with offsets and should be
+	used when printing stack backtraces. The specifier takes into
+	consideration the effect of compiler optimisations which may occur
+	when tail-call's are used and marked with the noreturn GCC attribute.
+
+	On ia64, ppc64 and parisc64 architectures function pointers are
+	actually function descriptors which must first be resolved. The 'F' and
+	'f' specifiers perform this resolution and then provide the same
+	functionality as the 'S' and 's' specifiers.
+
+Kernel Pointers:
+
+	%pK	0x01234567 or 0x0123456789abcdef
+
+	For printing kernel pointers which should be hidden from unprivileged
+	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
+	Documentation/sysctl/kernel.txt for more details.
+
+Struct Resources:
+
+	%pr	[mem 0x60000000-0x6fffffff flags 0x2200] or
+		[mem 0x0000000060000000-0x000000006fffffff flags 0x2200]
+	%pR	[mem 0x60000000-0x6fffffff pref] or
+		[mem 0x0000000060000000-0x000000006fffffff pref]
+
+	For printing struct resources. The 'R' and 'r' specifiers result in a
+	printed resource with ('R') or without ('r') a decoded flags member.
+
+MAC/FDDI addresses:
+
+	%pM	00:01:02:03:04:05
+	%pMF	00-01-02-03-04-05
+	%pm	000102030405
+
+	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
+	specifiers result in a printed address with ('M') or without ('m') byte
+	separators. The default byte separator is the colon (':').
+
+	Where FDDI addresses are concerned the 'F' specifier can be used after
+	the 'M' specifier to use dash ('-') separators instead of the default
+	separator.
+
+IPv4 addresses:
+
+	%pI4	1.2.3.4
+	%pi4	001.002.003.004
+	%p[Ii][hnbl]
+	
+	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
+	specifiers result in a printed address with ('i4') or without ('I4')
+	leading zeros.
+
+	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
+	host, network, big or little endian order addresses respectively. Where
+	no specifier is provided the default network/big endian order is used.
+
+IPv6 addresses:
+
+	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
+	%pi6	00010002000300040005000600070008
+	%pI6c	1:2:3:4:5:6:7:8
+
+	For printing IPv6 network-order 16-bit hex addresses. The 'I6' and 'i6'
+	specifiers result in a printed address with ('I6') or without ('i6')
+	colon-separators. Leading zeros are always used.
+
+	The additional 'c' specifier can be used with the 'I' specifier to
+	print a compressed IPv6 address as described by
+	http://tools.ietf.org/html/rfc5952
+
+UUID/GUID addresses:
+
+	%pUb	00010203-0405-0607-0809-0a0b0c0d0e0f
+	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
+	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
+	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
+
+	For printing-16 byte UUID/GUIDs addresses. The additional 'l', 'L',
+	'b' and 'B' specifiers are used to specify a little endian order in
+	lower ('l') or upper case ('L') hex characters - and big endian order
+	in lower ('b') or upper case ('B') hex characters.
+
+	Where no additional specifiers are used the default little endian
+	order with lower case hex characters will be printed.
+
+struct va_format:
+
+	%pV	
+
+	For printing struct va_format structures. These contain a format string
+	and va_list as follows:
+
+	struct va_format {
+		const char *fmt;
+		va_list *va;
+	};
+
+	Do not use this feature without some mechanism to verify the
+	correctness of the format string and va_list arguments.
 
 u64 SHOULD be printed with %llu/%llx, (unsigned long long):
 
@@ -32,4 +146,5 @@ Reminder: sizeof() result is of type size_t.
 Thank you for your cooperation and attention.
 
 
-By Randy Dunlap <rdunlap@xenotime.net>
+By Randy Dunlap <rdunlap@xenotime.net> and
+Andrew Murray <amurray@mpc-data.co.uk>
-- 
1.7.4.1

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

[Randy Dunlap]

On Thu,  9 Jun 2011 22:24:48 +0100 Andrew Murray wrote:

> From: Andrew Murray <amurray@mpc-data.co.uk>
> 
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers
> 
> Signed-off-by: Andrew Murray <amurray@mpc-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..6455e5b 100644
> --- a/Documentation/printk-formats.txt
> +++ b/Documentation/printk-formats.txt
> @@ -9,7 +9,121 @@ If variable is of Type,		use printk format specifier:

> +UUID/GUID addresses:
> +
> +	%pUb	00010203-0405-0607-0809-0a0b0c0d0e0f
> +	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
> +	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
> +	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
> +
> +	For printing-16 byte UUID/GUIDs addresses. The additional 'l', 'L',

	For printing 16-byte

You want to resend or shall I just fix it?

> +	'b' and 'B' specifiers are used to specify a little endian order in
> +	lower ('l') or upper case ('L') hex characters - and big endian order
> +	in lower ('b') or upper case ('B') hex characters.
> +
> +	Where no additional specifiers are used the default little endian
> +	order with lower case hex characters will be printed.


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

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

[Joe Perches]

On Thu, 2011-06-09 at 14:51 -0700, Randy Dunlap wrote:
> On Thu,  9 Jun 2011 22:24:48 +0100 Andrew Murray wrote:
> > +	For printing-16 byte UUID/GUIDs addresses. The additional 'l', 'L',
> 	For printing 16-byte
> You want to resend or shall I just fix it?

Hey Randy.

I find your seeming insistence on using a dash
between the numeric count and the word byte to
be a bit odd.

Stylistically, why do you want it there?

cheers, Joe

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

[Andrew Murray]

On 9 June 2011 23:00, Joe Perches <joe@perches.com> wrote:
> On Thu, 2011-06-09 at 14:51 -0700, Randy Dunlap wrote:
>> On Thu,  9 Jun 2011 22:24:48 +0100 Andrew Murray wrote:
>> > +   For printing-16 byte UUID/GUIDs addresses. The additional 'l', 'L',
>>       For printing 16-byte
>> You want to resend or shall I just fix it?

Yes Randy please fix it - may be quicker for us both!


>
> Hey Randy.
>
> I find your seeming insistence on using a dash
> between the numeric count and the word byte to
> be a bit odd.
>
> Stylistically, why do you want it there?
>
> cheers, Joe
>
>

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

[Randy Dunlap]

On Thu, 09 Jun 2011 15:00:29 -0700 Joe Perches wrote:

> On Thu, 2011-06-09 at 14:51 -0700, Randy Dunlap wrote:
> > On Thu,  9 Jun 2011 22:24:48 +0100 Andrew Murray wrote:
> > > +	For printing-16 byte UUID/GUIDs addresses. The additional 'l', 'L',
> > 	For printing 16-byte
> > You want to resend or shall I just fix it?
> 
> Hey Randy.
> 
> I find your seeming insistence on using a dash
> between the numeric count and the word byte to
> be a bit odd.
> 
> Stylistically, why do you want it there?

Mostly to make it clear.  It's too easy to be ambiguous.


> cheers, Joe

Without hyphen:

	For printing 16 byte UUID/GUIDs addresses.

Those adjectives are confusing.  I don't know what that phrase means.
It could easily mean 16 UUID/GUIDs, but it's ambiguous.

But

	For printing 16-byte UUID/GUIDs addresses.

That means (clearly to me) that UUID/GUIDs are 16-byte entities.

Or see www.incredibleenglish.com/pdf/Hyphens.pdf, section 1,
"Hyphenate unit modifiers."

Or see http://www.ehow.com/how_4473498_use-hyphen-sentence.html, section 1,
"Link compound modifiers with hyphens."

Or see http://www.getitwriteonline.com/archive/040201HyphAdj.htm


HTH.
---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

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

[Joe Perches]

On Thu, 2011-06-09 at 15:37 -0700, Randy Dunlap wrote:
> On Thu, 09 Jun 2011 15:00:29 -0700 Joe Perches wrote:
> see www.incredibleenglish.com/pdf/Hyphens.pdf, section 1,
> "Hyphenate unit modifiers."
> 
> Or see http://www.ehow.com/how_4473498_use-hyphen-sentence.html, section 1,
> "Link compound modifiers with hyphens."
> 
> Or see http://www.getitwriteonline.com/archive/040201HyphAdj.htm

Whatever floats your boat but my 5th grade English teacher
Sr. Mary likely would have been appalled by those articles.

cheers, Joe

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

[Randy Dunlap]

On Thu, 09 Jun 2011 15:53:38 -0700 Joe Perches wrote:

> On Thu, 2011-06-09 at 15:37 -0700, Randy Dunlap wrote:
> > On Thu, 09 Jun 2011 15:00:29 -0700 Joe Perches wrote:
> > see www.incredibleenglish.com/pdf/Hyphens.pdf, section 1,
> > "Hyphenate unit modifiers."
> > 
> > Or see http://www.ehow.com/how_4473498_use-hyphen-sentence.html, section 1,
> > "Link compound modifiers with hyphens."
> > 
> > Or see http://www.getitwriteonline.com/archive/040201HyphAdj.htm
> 
> Whatever floats your boat but my 5th grade English teacher
> Sr. Mary likely would have been appalled by those articles.
> 
> cheers, Joe

Thanks.

---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

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

[Randy Dunlap]

On Thu,  9 Jun 2011 22:24:48 +0100 Andrew Murray wrote:

> From: Andrew Murray <amurray@mpc-data.co.uk>
> 
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers
> 
> Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>

Applied with minor tweaks (including dropping trailing whitespace).

Thanks.

> ---
>  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..6455e5b 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	prev_fn_of_versatile_init+0x88/0x88
> +
> +	For printing symbols and function pointers. The 'S' and 's' specifiers
> +	result in the symbol name with ('S') or without ('s') offsets. Where
> +	this is used on a kernel without KALLSYMS - the symbol address is
> +	printed instead.
> +
> +	The 'B' specifier results in the symbol name with offsets and should be
> +	used when printing stack backtraces. The specifier takes into
> +	consideration the effect of compiler optimisations which may occur
> +	when tail-call's are used and marked with the noreturn GCC attribute.
> +
> +	On ia64, ppc64 and parisc64 architectures function pointers are
> +	actually function descriptors which must first be resolved. The 'F' and
> +	'f' specifiers perform this resolution and then provide the same
> +	functionality as the 'S' and 's' specifiers.
> +
> +Kernel Pointers:
> +
> +	%pK	0x01234567 or 0x0123456789abcdef
> +
> +	For printing kernel pointers which should be hidden from unprivileged
> +	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
> +	Documentation/sysctl/kernel.txt for more details.
> +
> +Struct Resources:
> +
> +	%pr	[mem 0x60000000-0x6fffffff flags 0x2200] or
> +		[mem 0x0000000060000000-0x000000006fffffff flags 0x2200]
> +	%pR	[mem 0x60000000-0x6fffffff pref] or
> +		[mem 0x0000000060000000-0x000000006fffffff pref]
> +
> +	For printing struct resources. The 'R' and 'r' specifiers result in a
> +	printed resource with ('R') or without ('r') a decoded flags member.
> +
> +MAC/FDDI addresses:
> +
> +	%pM	00:01:02:03:04:05
> +	%pMF	00-01-02-03-04-05
> +	%pm	000102030405
> +
> +	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
> +	specifiers result in a printed address with ('M') or without ('m') byte
> +	separators. The default byte separator is the colon (':').
> +
> +	Where FDDI addresses are concerned the 'F' specifier can be used after
> +	the 'M' specifier to use dash ('-') separators instead of the default
> +	separator.
> +
> +IPv4 addresses:
> +
> +	%pI4	1.2.3.4
> +	%pi4	001.002.003.004
> +	%p[Ii][hnbl]
> +	
> +	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
> +	specifiers result in a printed address with ('i4') or without ('I4')
> +	leading zeros.
> +
> +	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
> +	host, network, big or little endian order addresses respectively. Where
> +	no specifier is provided the default network/big endian order is used.
> +
> +IPv6 addresses:
> +
> +	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
> +	%pi6	00010002000300040005000600070008
> +	%pI6c	1:2:3:4:5:6:7:8
> +
> +	For printing IPv6 network-order 16-bit hex addresses. The 'I6' and 'i6'
> +	specifiers result in a printed address with ('I6') or without ('i6')
> +	colon-separators. Leading zeros are always used.
> +
> +	The additional 'c' specifier can be used with the 'I' specifier to
> +	print a compressed IPv6 address as described by
> +	http://tools.ietf.org/html/rfc5952
> +
> +UUID/GUID addresses:
> +
> +	%pUb	00010203-0405-0607-0809-0a0b0c0d0e0f
> +	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
> +	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
> +	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
> +
> +	For printing-16 byte UUID/GUIDs addresses. The additional 'l', 'L',
> +	'b' and 'B' specifiers are used to specify a little endian order in
> +	lower ('l') or upper case ('L') hex characters - and big endian order
> +	in lower ('b') or upper case ('B') hex characters.
> +
> +	Where no additional specifiers are used the default little endian
> +	order with lower case hex characters will be printed.
> +
> +struct va_format:
> +
> +	%pV	
> +
> +	For printing struct va_format structures. These contain a format string
> +	and va_list as follows:
> +
> +	struct va_format {
> +		const char *fmt;
> +		va_list *va;
> +	};
> +
> +	Do not use this feature without some mechanism to verify the
> +	correctness of the format string and va_list arguments.
>  
>  u64 SHOULD be printed with %llu/%llx, (unsigned long long):
>  
> @@ -32,4 +146,5 @@ Reminder: sizeof() result is of type size_t.
>  Thank you for your cooperation and attention.
>  
>  
> -By Randy Dunlap <rdunlap@xenotime.net>
> +By Randy Dunlap <rdunlap@xenotime.net> and
> +Andrew Murray <amurray@mpc-data.co.uk>
> -- 
> 1.7.4.1
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-embedded" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

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

[Andrew Murray]

Great! Thanks for the help.

On 10 June 2011 18:50, Randy Dunlap <rdunlap@xenotime.net> wrote:
> On Thu,  9 Jun 2011 22:24:48 +0100 Andrew Murray wrote:
>
>> From: Andrew Murray <amurray@mpc-data.co.uk>
>>
>> This patch updates the incomplete documentation concerning the printk
>> extended format specifiers
>>
>> Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
>
> Applied with minor tweaks (including dropping trailing whitespace).
>
> Thanks.
>
>> ---
>>  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..6455e5b 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     prev_fn_of_versatile_init+0x88/0x88
>> +
>> +     For printing symbols and function pointers. The 'S' and 's' specifiers
>> +     result in the symbol name with ('S') or without ('s') offsets. Where
>> +     this is used on a kernel without KALLSYMS - the symbol address is
>> +     printed instead.
>> +
>> +     The 'B' specifier results in the symbol name with offsets and should be
>> +     used when printing stack backtraces. The specifier takes into
>> +     consideration the effect of compiler optimisations which may occur
>> +     when tail-call's are used and marked with the noreturn GCC attribute.
>> +
>> +     On ia64, ppc64 and parisc64 architectures function pointers are
>> +     actually function descriptors which must first be resolved. The 'F' and
>> +     'f' specifiers perform this resolution and then provide the same
>> +     functionality as the 'S' and 's' specifiers.
>> +
>> +Kernel Pointers:
>> +
>> +     %pK     0x01234567 or 0x0123456789abcdef
>> +
>> +     For printing kernel pointers which should be hidden from unprivileged
>> +     users. The behaviour of %pK depends on the kptr_restrict sysctl - see
>> +     Documentation/sysctl/kernel.txt for more details.
>> +
>> +Struct Resources:
>> +
>> +     %pr     [mem 0x60000000-0x6fffffff flags 0x2200] or
>> +             [mem 0x0000000060000000-0x000000006fffffff flags 0x2200]
>> +     %pR     [mem 0x60000000-0x6fffffff pref] or
>> +             [mem 0x0000000060000000-0x000000006fffffff pref]
>> +
>> +     For printing struct resources. The 'R' and 'r' specifiers result in a
>> +     printed resource with ('R') or without ('r') a decoded flags member.
>> +
>> +MAC/FDDI addresses:
>> +
>> +     %pM     00:01:02:03:04:05
>> +     %pMF    00-01-02-03-04-05
>> +     %pm     000102030405
>> +
>> +     For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
>> +     specifiers result in a printed address with ('M') or without ('m') byte
>> +     separators. The default byte separator is the colon (':').
>> +
>> +     Where FDDI addresses are concerned the 'F' specifier can be used after
>> +     the 'M' specifier to use dash ('-') separators instead of the default
>> +     separator.
>> +
>> +IPv4 addresses:
>> +
>> +     %pI4    1.2.3.4
>> +     %pi4    001.002.003.004
>> +     %p[Ii][hnbl]
>> +
>> +     For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
>> +     specifiers result in a printed address with ('i4') or without ('I4')
>> +     leading zeros.
>> +
>> +     The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
>> +     host, network, big or little endian order addresses respectively. Where
>> +     no specifier is provided the default network/big endian order is used.
>> +
>> +IPv6 addresses:
>> +
>> +     %pI6    0001:0002:0003:0004:0005:0006:0007:0008
>> +     %pi6    00010002000300040005000600070008
>> +     %pI6c   1:2:3:4:5:6:7:8
>> +
>> +     For printing IPv6 network-order 16-bit hex addresses. The 'I6' and 'i6'
>> +     specifiers result in a printed address with ('I6') or without ('i6')
>> +     colon-separators. Leading zeros are always used.
>> +
>> +     The additional 'c' specifier can be used with the 'I' specifier to
>> +     print a compressed IPv6 address as described by
>> +     http://tools.ietf.org/html/rfc5952
>> +
>> +UUID/GUID addresses:
>> +
>> +     %pUb    00010203-0405-0607-0809-0a0b0c0d0e0f
>> +     %pUB    00010203-0405-0607-0809-0A0B0C0D0E0F
>> +     %pUl    03020100-0504-0706-0809-0a0b0c0e0e0f
>> +     %pUL    03020100-0504-0706-0809-0A0B0C0E0E0F
>> +
>> +     For printing-16 byte UUID/GUIDs addresses. The additional 'l', 'L',
>> +     'b' and 'B' specifiers are used to specify a little endian order in
>> +     lower ('l') or upper case ('L') hex characters - and big endian order
>> +     in lower ('b') or upper case ('B') hex characters.
>> +
>> +     Where no additional specifiers are used the default little endian
>> +     order with lower case hex characters will be printed.
>> +
>> +struct va_format:
>> +
>> +     %pV
>> +
>> +     For printing struct va_format structures. These contain a format string
>> +     and va_list as follows:
>> +
>> +     struct va_format {
>> +             const char *fmt;
>> +             va_list *va;
>> +     };
>> +
>> +     Do not use this feature without some mechanism to verify the
>> +     correctness of the format string and va_list arguments.
>>
>>  u64 SHOULD be printed with %llu/%llx, (unsigned long long):
>>
>> @@ -32,4 +146,5 @@ Reminder: sizeof() result is of type size_t.
>>  Thank you for your cooperation and attention.
>>
>>
>> -By Randy Dunlap <rdunlap@xenotime.net>
>> +By Randy Dunlap <rdunlap@xenotime.net> and
>> +Andrew Murray <amurray@mpc-data.co.uk>
>> --
>> 1.7.4.1
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-embedded" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>
> ---
> ~Randy
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
>

Re: [PATCH] Revised patch

[Randy Dunlap]

On Thu,  9 Jun 2011 18:33:46 +0100 Andrew Murray wrote:

> Hi,
> 
> I've updated this patch based on your feedback. This covers all the recent feedback.
> 
> From: Andrew Murray <amurray@mpc-data.co.uk>
> 
> This patch updates the incomplete documentation concerning the printk
> extended format specifiers.

Thanks.  A few comments below...

> Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
> 
> ---
>  Documentation/printk-formats.txt |  113 +++++++++++++++++++++++++++++++++++++-
>  1 files changed, 111 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
> index 1b5a5dd..2968cbf 100644
> --- a/Documentation/printk-formats.txt
> +++ b/Documentation/printk-formats.txt
> @@ -9,7 +9,115 @@ 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
> +
> +	For printing symbols and function pointers. The 'S' and 's' specifiers
> +	result in the symbol name with ('S') or without ('s') offsets. Where
> +	this is used on a kernel without KALLSYMS - the symbol address is
> +	printed instead.
> +
> +	On ia64, ppc64 and parisc64 architectures function pointers are
> +	actually function descriptors which must first be resolved. The 'F' and
> +	'f' specifiers perform this resolution and then provide the same
> +	functionality as the 'S' and 's' specifiers.
> +
> +Kernel Pointers:
> +
> +	%pK	0x01234567 or 0x0123456789abcdef
> +
> +	For printing kernel pointers which should be hidden from unprivileged
> +	users. The behaviour of %pK depends on the kptr_restrict sysctl - see
> +	Documentation/sysctl/kernel.txt for more details.
> +
> +Struct Resources:
> +
> +	%pr	[mem 0x60000000-0x6fffffff flags 0x2200] or
> +		[mem 0x0000000060000000-0x000000006fffffff flags 0x2200]
> +	%pR	[mem 0x60000000-0x6fffffff pref] or
> +		[mem 0x0000000060000000-0x000000006fffffff pref]
> +
> +	For printing struct resources. The 'R' and 'r' specifiers result in a
> +	printed resource with ('R') or without ('r') a decoded flags member.
> +
> +MAC/FDDI addresses:
> +
> +	%pM	00:01:02:03:04:05
> +	%pMF	00-01-02-03-04-05
> +	%pm	000102030405
> +
> +	For printing 6-byte MAC/FDDI addresses in hex notation. The 'M' and 'm'
> +	specifiers result in a printed address with ('M') or without ('m') byte
> +	separators. The default byte separator is the colon (':').
> +
> +	Where FDDI addresses are concerned the 'F' specifier can be used after
> +	the 'M' specifier to use dash ('-') separators instead of the default
> +	separator.
> +
> +IPv4 addresses:
> +
> +	%pI4	1.2.3.4
> +	%pi4	001.002.003.004
> +	%p[Ii][hnbl]
> +	
> +	For printing IPv4 dot-separated decimal addresses. The 'I4' and 'i4'
> +	specifiers result in a printed address with ('i4') or without ('I4')
> +	leading zeros.
> +
> +	The additional 'h', 'n', 'b', and 'l' specifiers are used to specify
> +	host, network, big or little endian order addresses respectively. Where
> +	no specifier is provided the default network/big endian order is used.
> +

I would hyphenate the -endian types, but won't insist on that.

> +IPv6 addresses:
> +
> +	%pI6	0001:0002:0003:0004:0005:0006:0007:0008
> +	%pi6	00010002000300040005000600070008
> +	%pI6c	1:2:3:4:5:6:7:8
> +
> +	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'

	                                16-bit

> +	specifiers result in a printed address with ('I6') or without ('i6')
> +	colon-separators. Leading zeros are always used.
> +
> +	The additional 'c' specifier can be used with the 'I' specifier to
> +	print a compressed IPv6 address as described by
> +	http://tools.ietf.org/html/rfc5952
> +
> +UUID/GUID addresses:
> +
> +	%pUb	00010203-0405-0607-0809-0a0b0c0d0e0f
> +	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
> +	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
> +	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
> +
> +	For printing 16 byte UUID/GUIDs addresses. The additional 'l', 'L',

	             16-byte

> +	'b' and 'B' specifiers are used to specify a little endian order in
> +	lower ('l') or upper case ('L') hex characters - and big endian order
> +	in lower ('b') or upper case ('B') hex characters.
> +
> +	Where no additional specifiers are used the default little endian
> +	order with lower case hex characters will be printed.
> +
> +struct va_format:
> +
> +	%pV	
> +
> +	For printing struct va_format structures. These contain a format string
> +	and va_list as follows:
> +
> +	struct va_format {
> +		const char *fmt;
> +		va_list *va;
> +	};
> +
> +	Do not use this feature without some mechanism to verify the
> +	correctness of the format string and va_list arguments.
>  
>  u64 SHOULD be printed with %llu/%llx, (unsigned long long):


%pB is missing?
 * - 'B' For backtraced symbolic direct pointers with offset


> @@ -32,4 +140,5 @@ Reminder: sizeof() result is of type size_t.
>  Thank you for your cooperation and attention.
>  
>  
> -By Randy Dunlap <rdunlap@xenotime.net>
> +By Randy Dunlap <rdunlap@xenotime.net> and
> +Andrew Murray <amurray@mpc-data.co.uk>
> -- 


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***

Re: [PATCH] Revised patch

[Joe Perches]

On Thu, 2011-06-09 at 10:47 -0700, Randy Dunlap wrote:
> On Thu,  9 Jun 2011 18:33:46 +0100 Andrew Murray wrote:
> > +	For printing IPv6 network-order 16 bit hex addresses. The 'I6' and 'i6'
> 	                                16-bit

byte.  octet if pedantry is desired.