linux-kernel - Re: [PATCH] Updated, add get_range, allows a hyhpenated range to get

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Message-ID: <454923F7.8070202@oracle.com>
Date:	Wed, 01 Nov 2006 14:47:19 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Derek Fults <dfults@....com>
CC:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] Updated, add get_range, allows a hyhpenated range to
 get_options

Derek Fults wrote:
> 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@....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@...l.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

Ack that.

> 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. 

Can you make that change too, please?

-- 
~Randy
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