linux-kernel - Re: [PATCH 1/1] mm: compaction: avoid fast_isolate_around() to set pageblock

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Message-ID: <X7lwT2+uSVGKRApQ@redhat.com>
Date:   Sat, 21 Nov 2020 14:53:51 -0500
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Mel Gorman <mgorman@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Qian Cai <cai@....pw>
Cc:     Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>,
        Baoquan He <bhe@...hat.com>
Subject: Re: [PATCH 1/1] mm: compaction: avoid fast_isolate_around() to set
 pageblock_skip on reserved pages

On Sat, Nov 21, 2020 at 02:45:06PM -0500, Andrea Arcangeli wrote:
> +					if (likely(!PageReserved(page)))

NOTE: this line will have to become "likely(page &&
!PageReserved(page))" to handle the case of non contiguous zones,
since pageblock_pfn_to_page might return NULL in that case.. I noticed
right after sending, but I'll wait some feedback before resending the
correction in case it gets fixed in another way.