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From: Roman Gushchin To: Muchun Song Cc: hannes@cmpxchg.org, mhocko@kernel.org, shakeelb@google.com, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, duanxiongchun@bytedance.com, longman@redhat.com Subject: Re: [PATCH v4 10/11] mm: lru: add VM_BUG_ON_FOLIO to lru maintenance function Message-ID: References: <20220524060551.80037-1-songmuchun@bytedance.com> <20220524060551.80037-11-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220524060551.80037-11-songmuchun@bytedance.com> X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev X-Stat-Signature: x4s6iy33fuhnd1jfueu7nh7bp4oxdjkc X-Rspam-User: Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=mSuHENlG; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf17.hostedemail.com: domain of roman.gushchin@linux.dev designates 91.121.223.63 as permitted sender) smtp.mailfrom=roman.gushchin@linux.dev X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: D59DC40023 X-HE-Tag: 1653446382-496289 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 Tue, May 24, 2022 at 02:05:50PM +0800, Muchun Song wrote: > We need to make sure that the page is deleted from or added to the > correct lruvec list. So add a VM_BUG_ON_FOLIO() to catch invalid > users. > > Signed-off-by: Muchun Song > --- > include/linux/mm_inline.h | 6 ++++++ > mm/vmscan.c | 1 - > 2 files changed, 6 insertions(+), 1 deletion(-) > > diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h > index ac32125745ab..30d2393da613 100644 > --- a/include/linux/mm_inline.h > +++ b/include/linux/mm_inline.h > @@ -97,6 +97,8 @@ void lruvec_add_folio(struct lruvec *lruvec, struct folio *folio) > { > enum lru_list lru = folio_lru_list(folio); > > + VM_BUG_ON_FOLIO(!folio_matches_lruvec(folio, lruvec), folio); > + > update_lru_size(lruvec, lru, folio_zonenum(folio), > folio_nr_pages(folio)); > if (lru != LRU_UNEVICTABLE) > @@ -114,6 +116,8 @@ void lruvec_add_folio_tail(struct lruvec *lruvec, struct folio *folio) > { > enum lru_list lru = folio_lru_list(folio); > > + VM_BUG_ON_FOLIO(!folio_matches_lruvec(folio, lruvec), folio); > + > update_lru_size(lruvec, lru, folio_zonenum(folio), > folio_nr_pages(folio)); > /* This is not expected to be used on LRU_UNEVICTABLE */ > @@ -131,6 +135,8 @@ void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio) > { > enum lru_list lru = folio_lru_list(folio); > > + VM_BUG_ON_FOLIO(!folio_matches_lruvec(folio, lruvec), folio); > + > if (lru != LRU_UNEVICTABLE) > list_del(&folio->lru); > update_lru_size(lruvec, lru, folio_zonenum(folio), > diff --git a/mm/vmscan.c b/mm/vmscan.c > index 761d5e0dd78d..6c9e2eafc8f9 100644 > --- a/mm/vmscan.c > +++ b/mm/vmscan.c > @@ -2281,7 +2281,6 @@ static unsigned int move_pages_to_lru(struct list_head *list) > continue; > } > > - VM_BUG_ON_PAGE(!folio_matches_lruvec(folio, lruvec), page); The commit log describes well why we need to add new BUG_ON's. Please, add something on why this is removed. Thanks!