Re: [PATCH v5 6/6] mm: shrinkers: add scan interface for shrinker debugfs

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

On Wed, 1 Jun 2022 17:56:22 -0700 Roman Gushchin <roman.gushchin@xxxxxxxxx> wrote:

> > 
> > > +	ssize_t ret;
> > > +
> > > +	if (copy_from_user(kbuf, buf, read_len))
> > > +		return -EFAULT;
> > > +	kbuf[read_len] = '\0';
> > > +
> > > +	if (sscanf(kbuf, "%lu %d %lu", &ino, &nid, &nr_to_scan) < 2)
> > 
> > Was it intentional to permit more than three args?
> 
> Good catch! No, of course it wasn't intentional.
> 
> Below is an updated version of this patch.
> 
> ...
>
> +	if (sscanf(kbuf, "%lu %d %lu", &ino, &nid, &nr_to_scan) != 2)
> +		return -EINVAL;

s/2/3/methinks?