linux-kernel - Re: [PATCH] mm: page_isolation: use compound_nr() correctly in isolate_single

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Message-ID: <YpWqV2PKLc5Ss3XB@FVFYT0MHHV2J.usts.net>
Date:   Tue, 31 May 2022 13:40:39 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Zi Yan <ziy@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Qian Cai <quic_qiancai@...cinc.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Eric Ren <renzhengeek@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: Re: [PATCH] mm: page_isolation: use compound_nr() correctly in
 isolate_single_pageblock()

On Mon, May 30, 2022 at 10:44:50PM -0400, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> When compound_nr(page) was used, page was not guaranteed to be the head
> of the compound page and it could cause an infinite loop. Fix it by calling
> it on the head page.
> 
> Fixes: b2c9e2fbba32 ("mm: make alloc_contig_range work at pageblock granularity")
> Reported-by: Anshuman Khandual <anshuman.khandual@....com>
> Link: https://lore.kernel.org/linux-mm/20220530115027.123341-1-anshuman.khandual@arm.com/
> Signed-off-by: Zi Yan <ziy@...dia.com>

Acked-by: Muchun Song <songmuchun@...edance.com>

Thanks.