linux-kernel - Re: [PATCH v4] hugetlb: Fix wrong use of nr_online

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Date:   Fri, 29 Apr 2022 11:32:55 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Peng Liu <liupeng256@...wei.com>, mike.kravetz@...cle.com,
        akpm@...ux-foundation.org, yaozhenguo1@...il.com,
        baolin.wang@...ux.alibaba.com, songmuchun@...edance.com,
        liuyuntao10@...wei.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, wangkefeng.wang@...wei.com,
        dave@...olabs.net
Subject: Re: [PATCH v4] hugetlb: Fix wrong use of nr_online_nodes

On 16.04.22 12:35, 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>
> ---

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb