linux-kernel - Re: [PATCH] radix-tree: fix radix_tree_iter

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Message-ID: <20160718230939.GA2076@linux.intel.com>
Date:	Mon, 18 Jul 2016 17:09:39 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Jan Kara <jack@...e.cz>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-mm@...ck.org, Greg Thelen <gthelen@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>,
	syzkaller@...glegroups.com, Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>, stable@...r.kernel.org
Subject: Re: [PATCH] radix-tree: fix radix_tree_iter_retry() for tagged
 iterators.

On Fri, Jul 15, 2016 at 01:57:33PM -0700, Andrew Morton wrote:
> On Fri, 15 Jul 2016 13:00:40 -0600 Ross Zwisler <ross.zwisler@...ux.intel.com> wrote:
> 
> > 
> > ...
> >
> > In looking at this more, I agree that your patch fixes this particular bug,
> > but I think that ultimately we might want something more general.
> > 
> > ...
> >
> > --- a/include/linux/radix-tree.h
> > +++ b/include/linux/radix-tree.h
> > @@ -463,6 +463,9 @@ static inline struct radix_tree_node *entry_to_node(void *ptr)
> >  static __always_inline void **
> >  radix_tree_next_slot(void **slot, struct radix_tree_iter *iter, unsigned flags)
> >  {
> > +	if (unlikely(!slot))
> > +		return NULL;
> > +
> >  	if (flags & RADIX_TREE_ITER_TAGGED) {
> >  		void *canon = slot;
> 
> I'll hang onto Andrey's
> radix-tree-fix-radix_tree_iter_retry-for-tagged-iterators.patch for
> now, plan to send it in to Linus Wednesdayish.  If we can get the above
> settled down prior to that then I shall swap over.

Sure, that works for me.