Re: [PATCH v2] lib: Documentation: Synchronize %p formatting documentation

Shevchenko, Andriy
2015-09-24T08:20:51Z

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On Thu, 2015-09-24 at 11:16 +0300, Andy Shevchenko wrote:
> On Thu, 2015-09-24 at 10:08 +0200, Martin Kletzander wrote:
> > Move all pointer-formatting documentation to one place in the code
> > and
> > one place in the documentation instead of keeping it in three
> > places
> > with different level of completeness. Documentation/printk
> > -formats.txt
> > has detailed information about each modifier, docstring above
> > pointer()
> > has short descriptions of them (as that is the function dealing
> > with
> > %p)
> > and docstring above vsprintf() is removed as redundant. Both
> > docstrings
> > in the code that were modified are updated with a reminder of
> > updating
> > the documentation upon any further change.
> >
>
> Good for me!
>
> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
>

Ah, sorry, it seems you have to distinguish %pn (which seems now as %p
+ n if I didn't miss anything) and %n.

After addressing this, take my above tag.

> > Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
> > ---
> > Documentation/printk-formats.txt | 27 +++++++++++++++++++++++++
> > lib/vsprintf.c | 43 ++++++++--------------------
> > --
> > ----------
> > 2 files changed, 35 insertions(+), 35 deletions(-)
> >
> > diff --git a/Documentation/printk-formats.txt
> > b/Documentation/printk
> > -formats.txt
> > index 2ec6d84f391c..c85e27264a2b 100644
> > --- a/Documentation/printk-formats.txt
> > +++ b/Documentation/printk-formats.txt
> > @@ -119,6 +119,7 @@ Raw buffer as an escaped string:
> > If field width is omitted the 1 byte only will be escaped.
> >
> > Raw buffer as a hex string:
> > +
> > %*ph 00 01 02 ... 3f
> > %*phC 00:01:02: ... :3f
> > %*phD 00-01-02- ... -3f
> > @@ -234,6 +235,7 @@ UUID/GUID addresses:
> > Passed by reference.
> >
> > dentry names:
> > +
> > %pd{,2,3,4}
> > %pD{,2,3,4}
> >
> > @@ -264,6 +266,8 @@ struct va_format:
> > va_list *va;
> > };
> >
> > + Implements a "recursive vsnprintf".
> > +
> > Do not use this feature without some mechanism to verify
> > the
> > correctness of the format string and va_list arguments.
> >
> > @@ -292,6 +296,29 @@ bitmap and its derivatives such as cpumask and
> >
> > nodemask:
> >
> > Passed by reference.
> >
> > +Network device features:
> > +
> > + %pNF 0x000000000000c000
> > +
> > + For printing netdev_features_t.
> > +
> > + Passed by reference.
> > +
> > +Command from struct task_struct
> > +
> > + %pT ls
> > +
> > + For printing executable name excluding path from struct
> > + task_struct.
> > +
> > + Passed by reference.
> > +
> > +Ignored argument:
> > +
> > + %pn
> > +
> > + The argument passed will be ignored.
> > +
> > Thank you for your cooperation and attention.
> >
> >
> > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> > index becd87facf48..9ab68775b840 100644
> > --- a/lib/vsprintf.c
> > +++ b/lib/vsprintf.c
> > @@ -1463,7 +1463,10 @@ int kptr_restrict __read_mostly;
> > * - 'Cn' For a clock, it prints the name (Common Clock Framework)
> >
> > or address
> > * (legacy clock framework) of the clock
> > * - 'Cr' For a clock, it prints the current rate of the clock
> > - * - 'T' task_struct->comm
> > + * - 'T' For task_struct->comm
> > + * - 'n' For ignored argument
> > + *
> > + * ** Please update Documentation/printk-formats.txt when making
> > changes **
> > *
> > * Note: The difference between 'S' and 'F' is that on ia64 and
> > ppc64
> > * function pointers are really function descriptors, which
> > contain
> > a
> > @@ -1829,41 +1832,11 @@ qualifier:
> > * @fmt: The format string to use
> > * @args: Arguments for the format string
> > *
> > - * This function follows C99 vsnprintf, but has some extensions:
> > - * %pS output the name of a text symbol with offset
> > - * %ps output the name of a text symbol without offset
> > - * %pF output the name of a function pointer with its offset
> > - * %pf output the name of a function pointer without its offset
> > - * %pB output the name of a backtrace symbol with its offset
> > - * %pR output the address range in a struct resource with decoded
> > flags
> > - * %pr output the address range in a struct resource with raw
> > flags
> > - * %pb output the bitmap with field width as the number of bits
> > - * %pbl output the bitmap as range list with field width as the
> > number of bits
> > - * %pM output a 6-byte MAC address with colons
> > - * %pMR output a 6-byte MAC address with colons in reversed order
> > - * %pMF output a 6-byte MAC address with dashes
> > - * %pm output a 6-byte MAC address without colons
> > - * %pmR output a 6-byte MAC address without colons in reversed
> > order
> > - * %pI4 print an IPv4 address without leading zeros
> > - * %pi4 print an IPv4 address with leading zeros
> > - * %pI6 print an IPv6 address with colons
> > - * %pi6 print an IPv6 address without colons
> > - * %pI6c print an IPv6 address as specified by RFC 5952
> > - * %pIS depending on sa_family of 'struct sockaddr *' print
> > IPv4/IPv6 address
> > - * %piS depending on sa_family of 'struct sockaddr *' print
> > IPv4/IPv6 address
> > - * %pU[bBlL] print a UUID/GUID in big or little endian using lower
> >
> > or upper
> > - * case.
> > - * %*pE[achnops] print an escaped buffer
> > - * %*ph[CDN] a variable-length hex string with a separator
> > (supports
> > up to 64
> > - * bytes of the input)
> > - * %pC output the name (Common Clock Framework) or address (legacy
> >
> > clock
> > - * framework) of a clock
> > - * %pCn output the name (Common Clock Framework) or address
> > (legacy
> > clock
> > - * framework) of a clock
> > - * %pCr output the current rate of a clock
> > - * %n is ignored
> > + * This function follows C99 vsnprintf, but has some extensions.
> > See
> > + * pointer() or Documentation/printk-formats.txt for all format
> > + * specifiers.
> > *
> > - * ** Please update Documentation/printk-formats.txt when making
> > changes **
> > + * ** Please update the documentation when making changes **
> > *
> > * The return value is the number of characters which would
> > * be generated for the given input, excluding the trailing
>

--
Andy Shevchenko <andriy.shevchenko@intel.com>
Intel Finland Oy
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