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

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Message-ID: <alpine.DEB.2.20.1704201550130.2059@nanos>
Date:   Thu, 20 Apr 2017 15:51:03 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Vikas Shivappa <vikas.shivappa@...ux.intel.com>
cc:     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 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.

Thanks,

	tglx