Re: [PATCH v10 11/13] x86/resctrl: Add interface to write mbm_total_bytes_config

[Reinette Chatre]

Hi Babu,

On 12/22/2022 3:31 PM, Babu Moger wrote:

...

> +static ssize_t mbm_total_bytes_config_write(struct kernfs_open_file *of,
> +					    char *buf, size_t nbytes,
> +					    loff_t off)
> +{
> +	struct rdt_resource *r = of->kn->parent->priv;
> +	int ret;
> +
> +	/* Valid input requires a trailing newline */
> +	if (nbytes == 0 || buf[nbytes - 1] != '\n')
> +		return -EINVAL;
> +
> +	cpus_read_lock();

Could you please elaborate why this lock is needed here as
well as in the following patch?

Reinette