linux-kernel - Re: [PATCH v3 1/4] hugetlb: Fix wrong use of nr_online

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Date:   Wed, 13 Apr 2022 14:29:48 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Peng Liu <liupeng256@...wei.com>, mike.kravetz@...cle.com,
        david@...hat.com, akpm@...ux-foundation.org, yaozhenguo1@...il.com,
        songmuchun@...edance.com, liuyuntao10@...wei.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/4] hugetlb: Fix wrong use of nr_online_nodes



On 4/13/2022 11:29 AM, Peng Liu wrote:
> Certain systems are designed to have sparse/discontiguous nodes. In
> this case, nr_online_nodes can not be used to walk through numa node.
> Also, a valid node may be greater than nr_online_nodes.
> 
> However, in hugetlb, it is assumed that nodes are contiguous. Recheck
> all the places that use nr_online_nodes, and repair them one by one.
> 
> Suggested-by: David Hildenbrand <david@...hat.com>
> Fixes: 4178158ef8ca ("hugetlbfs: fix issue of preallocation of gigantic pages can't work")
> Fixes: b5389086ad7b ("hugetlbfs: extend the definition of hugepages parameter to support node allocation")
> Fixes: e79ce9832316 ("hugetlbfs: fix a truncation issue in hugepages parameter")
> Fixes: f9317f77a6e0 ("hugetlb: clean up potential spectre issue warnings")
> Signed-off-by: Peng Liu <liupeng256@...wei.com>

LGTM.
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>