linux-kernel - Re: [PATCH v4 12/18] x86/intel_rdt: Add "info" files to resctrl file system

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Date:   Mon, 17 Oct 2016 21:46:30 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Fenghua Yu <fenghua.yu@...el.com>
cc:     "H. Peter Anvin" <h.peter.anvin@...el.com>,
        Ingo Molnar <mingo@...e.hu>, Tony Luck <tony.luck@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Stephane Eranian <eranian@...gle.com>,
        Borislav Petkov <bp@...e.de>,
        Dave Hansen <dave.hansen@...el.com>,
        Nilay Vaish <nilayvaish@...il.com>, Shaohua Li <shli@...com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        Ravi V Shankar <ravi.v.shankar@...el.com>,
        Sai Prakhya <sai.praneeth.prakhya@...el.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org>
Subject: Re: [PATCH v4 12/18] x86/intel_rdt: Add "info" files to resctrl file
 system

On Fri, 14 Oct 2016, Fenghua Yu wrote:
>  static int __init rdtgroup_setup_root(void)
>  {
> +	int ret;
> +
>  	rdt_root = kernfs_create_root(&rdtgroup_kf_syscall_ops,
>  				      KERNFS_ROOT_CREATE_DEACTIVATED,
>  				      &rdtgroup_default);
> @@ -193,7 +364,9 @@ static int __init rdtgroup_setup_root(void)
>  	list_add(&rdtgroup_default.rdtgroup_list, &rdt_all_groups);
>  
>  	rdtgroup_default.kn = rdt_root->kn;
> -	kernfs_activate(rdtgroup_default.kn);
> +	ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
> +	if (!ret)
> +		kernfs_activate(rdtgroup_default.kn);
>  
>  	mutex_unlock(&rdtgroup_mutex);

So this is followed by:

   	return 0;

which means that an error in rdtgroup_create_info_dir() is ignored. As a
consequence the mount point is created and the file system is registered
w/o the info directory....

Thanks,

	tglx