linux-kernel - Re: [PATCH v14 26/32] fs/resctrl: Introduce mbm_assign_on

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Message-ID: <dd4a1021-b996-438e-941c-69dfcea5f22a@intel.com>
Date: Wed, 25 Jun 2025 16:24:18 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<Dave.Martin@....com>, <james.morse@....com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <akpm@...ux-foundation.org>,
	<rostedt@...dmis.org>, <paulmck@...nel.org>, <thuth@...hat.com>,
	<ardb@...nel.org>, <gregkh@...uxfoundation.org>, <seanjc@...gle.com>,
	<thomas.lendacky@....com>, <pawan.kumar.gupta@...ux.intel.com>,
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	<peterz@...radead.org>, <xiaoyao.li@...el.com>, <kan.liang@...ux.intel.com>,
	<mario.limonciello@....com>, <xin3.li@...el.com>, <gautham.shenoy@....com>,
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	<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
	<eranian@...gle.com>, <linux-doc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v14 26/32] fs/resctrl: Introduce mbm_assign_on_mkdir to
 enable assignments on mkdir

Hi Babu,

On 6/13/25 2:05 PM, Babu Moger wrote:
> +static ssize_t resctrl_mbm_assign_on_mkdir_write(struct kernfs_open_file *of,
> +						 char *buf, size_t nbytes, loff_t off)
> +{
> +	struct rdt_resource *r = rdt_kn_parent_priv(of->kn);
> +	bool value;
> +	int ret;
> +
> +	ret = kstrtobool(buf, &value);
> +	if (ret)
> +		return ret;
> +
> +	mutex_lock(&rdtgroup_mutex);
> +	rdt_last_cmd_clear();
> +
> +	r->mon.mbm_assign_on_mkdir = value;
> +
> +	mutex_unlock(&rdtgroup_mutex);
> +
> +	return ret ?: nbytes;

The static checker I tried complained here that ret can only be zero here.

Reinette