linux-kernel - Re: [RFCv3][PATCH 1/4] replace string_get

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Date:	Tue, 04 Oct 2011 13:42:37 -0700
From:	Joe Perches <joe@...ches.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	rientjes@...gle.com, James.Bottomley@...senPartnership.com,
	hpa@...or.com
Subject: Re: [RFCv3][PATCH 1/4] replace string_get_size() arrays

On Tue, 2011-10-04 at 12:35 -0700, Dave Hansen wrote:
> On Sat, 2011-10-01 at 12:33 -0700, Joe Perches wrote:
> > On Fri, 2011-09-30 at 17:08 -0700, Dave Hansen wrote:
> > > Instead of explicitly storing the entire string for each
> > > possible units, just store the thing that varies: the
> > > first character.
> > trivia
> I'm not sure what you mean by that.

that what followed wasn't a declaration of defect, just trivial.

> > > diff -puN lib/string_helpers.c~string_get_size-pow2 lib/string_helpers.c
> > > --- linux-2.6.git/lib/string_helpers.c~string_get_size-pow2	2011-09-30 16:50:31.628981352 -0700
> > > +++ linux-2.6.git-dave/lib/string_helpers.c	2011-09-30 17:04:02.211607364 -0700
> > > @@ -8,6 +8,23 @@
> > >  #include <linux/module.h>
> > >  #include <linux/string_helpers.h>
> > >  
> > > +static const char byte_units[] = "_KMGTPEZY";
> > 
> > u64 could be up to ~1.8**19 decimal
> > zetta and yotta are not possible or necessary.
> > u128 maybe someday, but then other changes
> > would be necessary too.
> 
> Right, but we're only handling u64.

So the declaration should be:

	static const char byte_units[] = " KMGTPE";


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