linux-kernel - Re: [PATCH 2/3] x86/intel_rdt: Trim whitespace while parsing schemata input

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Date:   Thu, 20 Apr 2017 10:51:25 -0700 (PDT)
From:   Shivappa Vikas <vikas.shivappa@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>
cc:     Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        vikas.shivappa@...el.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, sai.praneeth.prakhya@...el.com,
        hpa@...or.com, mingo@...nel.org, ravi.v.shankar@...el.com,
        tony.luck@...el.com, fenghua.yu@...el.com
Subject: Re: [PATCH 2/3] x86/intel_rdt: Trim whitespace while parsing schemata
 input



On Thu, 20 Apr 2017, Thomas Gleixner wrote:

> On Wed, 19 Apr 2017, Vikas Shivappa wrote:
>
>> Schemata is displayed in tabular format which introduces some whitespace
>> to show data in a tabular format. If user wants to input the same data
>> that is displayed, the parsing fails. Trim the leading and trailing
>> whitespace to help parse such data.
>>
>> Reported-by: Prakhya, Sai Praneeth <sai.praneeth.prakhya@...el.com>
>> Signed-off-by: Vikas Shivappa <vikas.shivappa@...ux.intel.com>
>> Tested-by: Prakhya, Sai Praneeth <sai.praneeth.prakhya@...el.com>
>> ---
>>  arch/x86/kernel/cpu/intel_rdt_schemata.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/intel_rdt_schemata.c b/arch/x86/kernel/cpu/intel_rdt_schemata.c
>> index 9467a00..3cfa1ca 100644
>> --- a/arch/x86/kernel/cpu/intel_rdt_schemata.c
>> +++ b/arch/x86/kernel/cpu/intel_rdt_schemata.c
>> @@ -143,7 +143,7 @@ static int parse_line(char *line, struct rdt_resource *r)
>>  		return -EINVAL;
>>  	list_for_each_entry(d, &r->domains, list) {
>>  		if (d->id == dom_id) {
>> -			if (r->parse_ctrlval(dom, r, d))
>> +			if (r->parse_ctrlval(strim(dom), r, d))
>>  				return -EINVAL;
>>  			goto next;
>>  		}
>> @@ -220,7 +220,7 @@ ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
>>  			goto out;
>>  		}
>>  		for_each_enabled_rdt_resource(r) {
>> -			if (!strcmp(resname, r->name) &&
>> +			if (!strcmp(strim(resname), r->name) &&
>
> Both strims() invocations are just silly. They can be done before the loop
> once instead of doing them over and over again.

Will fix. I went overboard not wanting to add a line

Thanks,
Vikas

>
> Thanks,
>
> 	tglx
>