linux-kernel - Re: [PATCH] Allow a hyphenated range in get

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Message-Id: <1162320874.9524.402.camel@lnx-dfults.americas.sgi.com>
Date:	Tue, 31 Oct 2006 12:54:34 -0600
From:	Derek Fults <dfults@....com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Allow a hyphenated range in get_options

Hi Randy,

On Tue, 2006-10-31 at 10:11 -0800, Randy Dunlap wrote:
> On Tue, 31 Oct 2006 11:25:16 -0600 Derek Fults wrote:
> 
> > This allows a hyphenated range of positive numbers in the string passed
> > to command line helper function, get_options.    
> > 
> > Signed-off-by: Derek Fults <dfults@....com>  
> 
> Hi,
> Needs justification (why?) and a user.
> 

Currently the command line option "isolcpus=" takes as its argument a
list of cpus.  
Format: <cpu number>,...,<cpu number>
This can get extremely long when isolating the majority of cpus on a
large system.  Valid values of  <cpu_number>  include all cpus, 0 to
"number of CPUs in system - 1".

> > Index: linux/lib/cmdline.c
> > ===================================================================
> > --- linux.orig/lib/cmdline.c	2006-09-19 22:42:06.000000000 -0500
> > +++ linux/lib/cmdline.c	2006-10-30 10:39:13.351641023 -0600
> > @@ -29,6 +29,10 @@
> >   *	0 : no int in string
> >   *	1 : int found, no subsequent comma
> >   *	2 : int found including a subsequent comma
> > + *  -(int): int found with a subsequent hyphen to denote a range.
> > + *          The negative number is the number of integers in the range
> > + *          used to increment the counter in the while loop.
> > + *      
> >   */
> >  
> >  int get_option (char **str, int *pint)
> > @@ -44,7 +48,16 @@
> >  		(*str)++;
> >  		return 2;
> >  	}
> > +	if (**str == '-') {
> > +	    int x,inc_counter= 0, upper_range = 0;
> 
> space after comma.
> 
> Odd indentation here.  Use tabs, no spaces.
> 
> > +	    (*str)++;
> > +	    upper_range = simple_strtol ((*str), NULL, 0);
> 
> No space after function name.
> 
> > +	    inc_counter = upper_range - *pint ;
> > +	    for (x=*pint; x < upper_range; x++) 
> 
> No whitespace at ends of lines (as above has).
> Space around '=' sign.
> 
> > +		    *pint++ = x;
> > +	    return -inc_counter;
> > +	}
> >  	return 1;
> >  }
> >  
> > @@ -55,7 +68,8 @@
> >   *	@ints: integer array
> >   *
> >   *	This function parses a string containing a comma-separated
> > - *	list of integers.  The parse halts when the array is
> > + *	list of integers, a hyphen-separated range of _positive_ integers,
> > + *      or a combination of both.  The parse halts when the array is
> 
> Fix indentation to be same as other lines.
> 
> >   *	full, or when no more numbers can be retrieved from the
> >   *	string.
> >   *
> > @@ -75,6 +89,11 @@
> >  		i++;
> >  		if (res == 1)
> >  			break;
> > +		if (res < 0) 
> > +		        /* Decrement the result by one to leave out the 
> > +			   last number in the range.  The next iteration 
> > +			   will handle the upper number in the range */
> > +		        i += ((-res) - 1);
> >  	}
> >  	ints[0] = i - 1;
> >  	return (char *)str;
> > 
> > -
> 
> 
> ---
> ~Randy
Derek
-
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