Re: [PATCH 1/4] s390: convert debug_info.ref_count from atomic_t to refcount_t

[Peter Zijlstra]

On Mon, Feb 20, 2017 at 02:24:24PM +0100, Heiko Carstens wrote:
> On Mon, Feb 20, 2017 at 01:06:18PM +0200, Elena Reshetova wrote:

> > @@ -361,7 +361,7 @@ debug_info_create(const char *name, int pages_per_area, int nr_areas,
> >          debug_area_last = rc;
> >          rc->next = NULL;
> >  
> > -	debug_info_get(rc);
> > +	refcount_set(&rc->ref_count, 1);
> 
> This is not wrong, but I will remove this hunk before applying your patch,
> since this doesn't look like an obvious correct change at first glance.

I suspect; but have not looked at the code; that this would otherwise
attempt to do a 0 -> 1 increment, which refcount_inc() will refuse (and
WARN) over.