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Wed, 17 Mar 2021 11:15:51 +0000 (UTC) Received: from [10.36.112.124] (ovpn-112-124.ams2.redhat.com [10.36.112.124]) by smtp.corp.redhat.com (Postfix) with ESMTP id 170795D74F; Wed, 17 Mar 2021 11:15:48 +0000 (UTC) Subject: Re: [PATCH v5 5/5] mm,page_alloc: Drop unnecessary checks from pfn_range_valid_contig To: Oscar Salvador , Andrew Morton Cc: Vlastimil Babka , Michal Hocko , Muchun Song , Mike Kravetz , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20210317111251.17808-1-osalvador@suse.de> <20210317111251.17808-6-osalvador@suse.de> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: <001bc29f-ba70-b8f3-c77d-61345e30c0d7@redhat.com> Date: Wed, 17 Mar 2021 12:15:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: <20210317111251.17808-6-osalvador@suse.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Stat-Signature: 3wzh6iekdpgknbn5snibfs8eyd54pa6p X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 94AB52000384 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf18; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=216.205.24.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615979756-229503 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 17.03.21 12:12, Oscar Salvador wrote: > pfn_range_valid_contig() bails out when it finds an in-use page or a > hugetlb page, among other things. > We can drop the in-use page check since __alloc_contig_pages can migrate > away those pages, and the hugetlb page check can go too since > isolate_migratepages_range is now capable of dealing with hugetlb pages. > Either way, those checks are racy so let the end function handle it > when the time comes. > > Signed-off-by: Oscar Salvador > Suggested-by: David Hildenbrand > --- > mm/page_alloc.c | 6 ------ > 1 file changed, 6 deletions(-) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 4cb455355f6d..50d73e68b79e 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -8685,12 +8685,6 @@ static bool pfn_range_valid_contig(struct zone *z, unsigned long start_pfn, > > if (PageReserved(page)) > return false; > - > - if (page_count(page) > 0) > - return false; > - > - if (PageHuge(page)) > - return false; > } > return true; > } > Reviewed-by: David Hildenbrand -- Thanks, David / dhildenb