On Thu, Apr 29, 2021 at 2:49 PM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > > On Wed, Apr 28, 2021 at 05:49:47PM +0800, Muchun Song wrote: > > Introduce ida_max() to return the maximum allocated ID. This will be > > used by memory cgroup in the later patch. > > Please also add a lower-level xa_max as this funcationalty would also > come in handy at the xarray level in a few places. Good suggestion. This way is also efficient. Thanks.