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Tsirkin" , Mike Kravetz Subject: [PATCH v5 4/6] mm/page_isolation: cleanup set_migratetype_isolate() Date: Sun, 16 Aug 2020 14:53:31 +0200 Message-Id: <20200816125333.7434-5-david@redhat.com> In-Reply-To: <20200816125333.7434-1-david@redhat.com> References: <20200816125333.7434-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Rspamd-Queue-Id: 88ABA37604 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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: Let's clean it up a bit, simplifying the exit paths. Reviewed-by: Baoquan He Reviewed-by: Pankaj Gupta Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin Cc: Mike Kravetz Signed-off-by: David Hildenbrand --- mm/page_isolation.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index d099aac479601..e65fe5d770849 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -17,12 +17,9 @@ =20 static int set_migratetype_isolate(struct page *page, int migratetype, i= nt isol_flags) { - struct page *unmovable =3D NULL; - struct zone *zone; + struct zone *zone =3D page_zone(page); + struct page *unmovable; unsigned long flags; - int ret =3D -EBUSY; - - zone =3D page_zone(page); =20 spin_lock_irqsave(&zone->lock, flags); =20 @@ -51,13 +48,13 @@ static int set_migratetype_isolate(struct page *page,= int migratetype, int isol_ NULL); =20 __mod_zone_freepage_state(zone, -nr_pages, mt); - ret =3D 0; + spin_unlock_irqrestore(&zone->lock, flags); + drain_all_pages(zone); + return 0; } =20 spin_unlock_irqrestore(&zone->lock, flags); - if (!ret) { - drain_all_pages(zone); - } else if ((isol_flags & REPORT_FAILURE) && unmovable) { + if (isol_flags & REPORT_FAILURE) { /* * printk() with zone->lock held will likely trigger a * lockdep splat, so defer it here. @@ -65,7 +62,7 @@ static int set_migratetype_isolate(struct page *page, i= nt migratetype, int isol_ dump_page(unmovable, "unmovable page"); } =20 - return ret; + return -EBUSY; } =20 static void unset_migratetype_isolate(struct page *page, unsigned migrat= etype) --=20 2.26.2