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Date: Tue, 22 Mar 2016 05:27:08 -0400
From: Matthew Wilcox <willy@linux.intel.com>
To: Jan Kara <jack@suse.cz>
Cc: linux-fsdevel@vger.kernel.org, linux-nvdimm@lists.01.org,
	NeilBrown <neilb@suse.com>,
	"Wilcox, Matthew R" <matthew.r.wilcox@intel.com>
Subject: Re: [PATCH 02/10] radix-tree: make 'indirect' bit available to
 exception entries.
Message-ID: <20160322092708.GV23727@linux.intel.com>
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On Tue, Mar 22, 2016 at 10:12:32AM +0100, Jan Kara wrote:
> 		if (unlikely(!page))	// False since
> 					// RADIX_TREE_INDIRECT_PTR is set
> 		if (radix_tree_exception(page))	// False - no exeptional bit

Oops, you got confused:

static inline int radix_tree_exception(void *arg)
{
        return unlikely((unsigned long)arg &
                (RADIX_TREE_INDIRECT_PTR | RADIX_TREE_EXCEPTIONAL_ENTRY));
}