linux-kernel - Re: [PATCH v1 1/1] lib/vsprintf: refactor duplicate code to xnumber()

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Date:	Mon, 28 Dec 2015 16:18:30 -0800
From:	Joe Perches <joe@...ches.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/1] lib/vsprintf: refactor duplicate code to
 xnumber()

On Mon, 2015-12-28 at 21:02 +0200, Andy Shevchenko wrote:
> On Mon, Dec 28, 2015 at 8:25 PM, Joe Perches <joe@...ches.com> wrote:
> > On Mon, 2015-12-28 at 20:18 +0200, Andy Shevchenko wrote:
> > > xnumber() is a special helper to print a fixed size type in a hex format with
> > > '0x' prefix with padding and reduced size. In the module we have already
> > > several copies of such code. Consolidate them under xnumber() helper.
> > > 
> > > There are couple of differences though.
> > > 
> > > It seems nobody cared about the output in case of CONFIG_KALLSYMS=n when
> > > printing symbol address because the asked width is not enough to care either
> > > prefix or last byte. Fixed here.
> > > 
> > > The %pNF specifier used to be allowed with a specific field width, though there
> > > is neither any user of it nor mention in the documentation.
> > > 
> > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > > ---
> > >  lib/vsprintf.c | 43 +++++++++++++++----------------------------
> > >  1 file changed, 15 insertions(+), 28 deletions(-)
> > > 
> > > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> > > index dcf5646..e971549 100644
> > > --- a/lib/vsprintf.c
> > > +++ b/lib/vsprintf.c
> > > @@ -514,6 +514,16 @@ char *number(char *buf, char *end, unsigned long long num,
> > >       return buf;
> > >  }
> > > 
> > > +static noinline_for_stack
> > > +char *xnumber(char *buf, char *end, unsigned long long value, unsigned int type,
> > > +           struct printf_spec spec)
> > 
> > xnumber isn't a great name.
> 
> I rather agree, however had nothing yet to replace. Any ideas?

prefixed_hex_number?

> > unsigned int type should probably be size_t size
> 
> Used to be :-), though I decided to move it to unsigned int since the
> resulting field is anyway 8 bits of unsigned int.
> If you think it's better to do all conversion inside xnumber (or
> whatever name it would be), I redo this.

It's going to get cast to that field size anyway
as either size_t or unsigned int


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