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Tsirkin" , Mike Kravetz , Pankaj Gupta Subject: [PATCH v4 3/6] mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate() Date: Tue, 4 Aug 2020 21:41:39 +0200 Message-Id: <20200804194142.28279-4-david@redhat.com> In-Reply-To: <20200804194142.28279-1-david@redhat.com> References: <20200804194142.28279-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Rspamd-Queue-Id: 1E84A3D663 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 Content-Transfer-Encoding: quoted-printable 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: Inside has_unmovable_pages(), we have a comment describing how unmovable data could end up in ZONE_MOVABLE - via "movablecore". Also, besides checking if the first page in the pageblock is reserved, we don't perform any further checks in case of ZONE_MOVABLE. In case of memory offlining, we set REPORT_FAILURE, properly dump_page() the page and handle the error gracefully. alloc_contig_pages() users currently never allocate from ZONE_MOVABLE. E.g., hugetlb uses alloc_contig_pages() for the allocation of gigantic pages only, which will never end up on the MOVABLE zone (see htlb_alloc_mask()). Reviewed-by: Baoquan He Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin Cc: Mike Kravetz Cc: Pankaj Gupta Signed-off-by: David Hildenbrand --- mm/page_isolation.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index 7d7d263ce7f4b..d099aac479601 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -57,15 +57,12 @@ static int set_migratetype_isolate(struct page *page,= int migratetype, int isol_ spin_unlock_irqrestore(&zone->lock, flags); if (!ret) { drain_all_pages(zone); - } else { - WARN_ON_ONCE(zone_idx(zone) =3D=3D ZONE_MOVABLE); - - if ((isol_flags & REPORT_FAILURE) && unmovable) - /* - * printk() with zone->lock held will likely trigger a - * lockdep splat, so defer it here. - */ - dump_page(unmovable, "unmovable page"); + } else if ((isol_flags & REPORT_FAILURE) && unmovable) { + /* + * printk() with zone->lock held will likely trigger a + * lockdep splat, so defer it here. + */ + dump_page(unmovable, "unmovable page"); } =20 return ret; --=20 2.26.2