Re: [PATCH] Updated, add get_range, allows a hyhpenated range to get_options

[Derek Fults <dfults@sgi.com>]

On Wed, 2006-11-01 at 12:25 -0800, Randy Dunlap wrote:
> Derek Fults wrote:
> > On Wed, 2006-11-01 at 11:52 -0800, Randy Dunlap wrote:
> >> Derek Fults wrote:
> >>> This allows a hyphenated range of positive numbers M-N, in the string
> >>> passed to command line helper function, get_options.  This will expand
> >>> the range and insert the values[M, M+1, ..., N] into the ints array in
> >>> get_options.
> >>>
> >>> 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".
> >>>
> >>>
> >>> Signed-off-by: Derek Fults <dfults@sgi.com>  
> >>>
> >>> Index: linux/lib/cmdline.c
> >>> ===================================================================
> >>> --- linux.orig/lib/cmdline.c	2006-09-19 22:42:06.000000000 -0500
> >>> +++ linux/lib/cmdline.c	2006-11-01 12:36:20.059166727 -0600
> >>> @@ -16,6 +16,23 @@
> >>>  #include <linux/kernel.h>
> >>>  #include <linux/string.h>
> >>>  
> >>> +/**
> >>> + *	If a hyphen was found in get_option, this will handle the
> >>> + *	range of numbers, M-N.  This will expand the range and insert
> >>> + *	the values[M, M+1, ..., N] into the ints array in get_options.
> >>> + */
> >> Derek,
> >> Thanks for persisting thru this.  It's all fine for me except the
> >> comment block above.  If a comment block begins with "/**", then
> >> it's supposed to be in kernel-doc format (see
> >> Documentation/kernel-doc-nano-HOWTO.txt), with function name &
> >> parameters (if applicable).  However, that mostly needs to be done
> >> for non-static functions, so probably just change /** to /*
> >> and leave the rest of the comment block as is.
> >> My other comment-block comment was also about kernel long-comment
> >> style, which is
> >> /*
> >>  * begin
> >>  * more
> >>  * end
> >>  */
> >> so now you have achieved that also, so thanks again.
> > 
> > I fixed both comments to match that format.  Thanks for all the help and
> > your patience.
> > I'm posting the new patch in this replay.  Is that an acceptable
> > practice, or does one normally post all fixes to a patch in a new
> > message?
> 
> It happens both ways, but since this is mostly new code/feature,
> I suggest that you repost it and also cc: akpm@osdl.org on it.
> 
> And it still needs a user.  Will you be converting isolcpus=
> to use this functionality?
> It likely won't be merged until it has a user.
> 
Isolcpus will be using this code, but it does not need to be converted
in the kernel.  Isolated_cpu_setup() gets its string from the command
line and then makes the call to get_options with that string.  There is
a reference to the format of isolcpus= in kernel-parameters.txt, that
could reflect this enhancement.
Instead of:
Format: <cpu number>,...,<cpu number>

change to:
Format <cpu number>,...,<cpu number>-<cpu number>
<cpu number>-<cpu number> must be a positive range in ascending order. 


Derek