linux-kernel - Re: [PATCH v4 16/18] x86/intel

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Date:   Tue, 18 Oct 2016 00:35:09 +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 16/18] x86/intel_rdt: Add schemata file

On Fri, 14 Oct 2016, Fenghua Yu wrote:
> +static void update_domains(struct rdt_resource *r, int closid)
> +{
> +	int cpu, idx = 0;
> +	struct list_head *l;
> +	struct rdt_domain *d;
> +	struct msr_param msr_param;
> +	struct cpumask cpu_mask;

Again. No cpumasks on stack.

> +ssize_t rdtgroup_schemata_write(struct kernfs_open_file *of,
> +				char *buf, size_t nbytes, loff_t off)
> +{
> +	char *tok, *resname;
> +	struct rdtgroup *rdtgrp;
> +	struct rdt_resource *r;
> +	int closid, ret = 0;
> +	u32 *l3_cbms = NULL;
> +
> +	/* Legal input requires a trailing newline */

s/Legal/Valid/ please. There is no law which enforces this.

> +	if (nbytes == 0 || buf[nbytes - 1] != '\n')
> +		return -EINVAL;
> +	buf[nbytes - 1] = '\0';
> +
> +	rdtgrp = rdtgroup_kn_lock_live(of->kn);
> +	if (!rdtgrp) {
> +		rdtgroup_kn_unlock(of->kn);
> +		return -ENOENT;
> +	}
> +
> +	closid = rdtgrp->closid;
> +
> +	/* get scratch space to save all the masks while we validate input */
> +	for_each_rdt_resource(r) {
> +		r->tmp_cbms = kcalloc(r->num_domains << r->cdp_enabled,
> +				      sizeof(*l3_cbms), GFP_KERNEL);
> +		if (!r->tmp_cbms) {
> +			ret = -ENOMEM;
> +			goto fail;
> +		}
> +		r->num_cbms = 0;

This wants to be r->num_tmp_cbms for clarity.

Thanks,

	tglx