Re: [PATCH 6/9] XArray: internal node is a xa_node when it is bigger than XA_ZERO_ENTRY

[Matthew Wilcox]

On Mon, Mar 30, 2020 at 12:36:40PM +0000, Wei Yang wrote:
> As the comment mentioned, we reserved several ranges of internal node
> for tree maintenance, 0-62, 256, 257. This means a node bigger than
> XA_ZERO_ENTRY is a normal node.
> 
> The checked on XA_ZERO_ENTRY seems to be more meaningful.

257-1023 are also reserved, they just aren't used yet.  XA_ZERO_ENTRY
is not guaranteed to be the largest reserved entry.