linux-kernel - Re: [PATCH 7/9] ida: introduce ida_max() to return the maximum allocated ID

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Date:   Thu, 29 Apr 2021 07:47:51 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Muchun Song <songmuchun@...edance.com>
Cc:     willy@...radead.org, akpm@...ux-foundation.org, hannes@...xchg.org,
        mhocko@...nel.org, vdavydov.dev@...il.com, shakeelb@...gle.com,
        guro@...com, shy828301@...il.com, alexs@...nel.org,
        alexander.h.duyck@...ux.intel.com, richard.weiyang@...il.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 7/9] ida: introduce ida_max() to return the maximum
 allocated ID

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.