Re: [PATCH v2 4/8] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC_CTRL feature

[Alexey Dobriyan]

> +	len = sprintf(buf, "%d\n", READ_ONCE(*field));

READ_ONCE isn't necessary as there is only one read being made.

> +	len = min(count, sizeof(buf) - 1);
> +	if (copy_from_user(buf, user_buf, len))
> +		return -EFAULT;
> +
> +	buf[len] = '\0';
> +	if (kstrtouint(buf, 0, &enable))
> +		return -EINVAL;

There is kstrto*_from_user().