From nobody Fri Sep 12 00:16:11 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 789E8C6379F for ; Wed, 15 Feb 2023 10:40:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234139AbjBOKkK (ORCPT ); Wed, 15 Feb 2023 05:40:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59290 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234136AbjBOKjz (ORCPT ); Wed, 15 Feb 2023 05:39:55 -0500 Received: from out30-133.freemail.mail.aliyun.com (out30-133.freemail.mail.aliyun.com [115.124.30.133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1FD5B360B4; Wed, 15 Feb 2023 02:39:52 -0800 (PST) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R541e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046049;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=19;SR=0;TI=SMTPD_---0VbkDfWy_1676457588; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0VbkDfWy_1676457588) by smtp.aliyun-inc.com; Wed, 15 Feb 2023 18:39:49 +0800 From: Baolin Wang To: akpm@linux-foundation.org Cc: torvalds@linux-foundation.org, sj@kernel.org, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeelb@google.com, muchun.song@linux.dev, naoya.horiguchi@nec.com, linmiaohe@huawei.com, david@redhat.com, osalvador@suse.de, mike.kravetz@oracle.com, willy@infradead.org, baolin.wang@linux.alibaba.com, damon@lists.linux.dev, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 4/4] mm: change to return bool for isolate_movable_page() Date: Wed, 15 Feb 2023 18:39:37 +0800 Message-Id: X-Mailer: git-send-email 2.27.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Now the isolate_movable_page() can only return 0 or -EBUSY, and no users will care about the negative return value, thus we can convert the isolate_movable_page() to return a boolean value to make the code more clear when checking the movable page isolation state. No functional changes intended. Signed-off-by: Baolin Wang Acked-by: David Hildenbrand Reviewed-by: Matthew Wilcox (Oracle) --- include/linux/migrate.h | 6 +++--- mm/compaction.c | 2 +- mm/memory-failure.c | 4 ++-- mm/memory_hotplug.c | 10 +++++----- mm/migrate.c | 6 +++--- 5 files changed, 14 insertions(+), 14 deletions(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index c88b96b48be7..6b252f519c86 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -71,7 +71,7 @@ extern int migrate_pages(struct list_head *l, new_page_t = new, free_page_t free, unsigned long private, enum migrate_mode mode, int reason, unsigned int *ret_succeeded); extern struct page *alloc_migration_target(struct page *page, unsigned lon= g private); -extern int isolate_movable_page(struct page *page, isolate_mode_t mode); +extern bool isolate_movable_page(struct page *page, isolate_mode_t mode); =20 int migrate_huge_page_move_mapping(struct address_space *mapping, struct folio *dst, struct folio *src); @@ -92,8 +92,8 @@ static inline int migrate_pages(struct list_head *l, new_= page_t new, static inline struct page *alloc_migration_target(struct page *page, unsigned long private) { return NULL; } -static inline int isolate_movable_page(struct page *page, isolate_mode_t m= ode) - { return -EBUSY; } +static inline bool isolate_movable_page(struct page *page, isolate_mode_t = mode) + { return false; } =20 static inline int migrate_huge_page_move_mapping(struct address_space *map= ping, struct folio *dst, struct folio *src) diff --git a/mm/compaction.c b/mm/compaction.c index d73578af44cc..ad7409f70519 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -976,7 +976,7 @@ isolate_migratepages_block(struct compact_control *cc, = unsigned long low_pfn, locked =3D NULL; } =20 - if (!isolate_movable_page(page, mode)) + if (isolate_movable_page(page, mode)) goto isolate_success; } =20 diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 8604753bc644..a1ede7bdce95 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -2515,8 +2515,8 @@ static bool isolate_page(struct page *page, struct li= st_head *pagelist) if (lru) isolated =3D isolate_lru_page(page); else - isolated =3D !isolate_movable_page(page, - ISOLATE_UNEVICTABLE); + isolated =3D isolate_movable_page(page, + ISOLATE_UNEVICTABLE); =20 if (isolated) { list_add(&page->lru, pagelist); diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 5fc2dcf4e3ab..bcb0dc41c2f2 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1668,18 +1668,18 @@ do_migrate_range(unsigned long start_pfn, unsigned = long end_pfn) * We can skip free pages. And we can deal with pages on * LRU and non-lru movable pages. */ - if (PageLRU(page)) { + if (PageLRU(page)) isolated =3D isolate_lru_page(page); - ret =3D isolated ? 0 : -EBUSY; - } else - ret =3D isolate_movable_page(page, ISOLATE_UNEVICTABLE); - if (!ret) { /* Success */ + else + isolated =3D isolate_movable_page(page, ISOLATE_UNEVICTABLE); + if (isolated) { /* Success */ list_add_tail(&page->lru, &source); if (!__PageMovable(page)) inc_node_page_state(page, NR_ISOLATED_ANON + page_is_file_lru(page)); =20 } else { + ret =3D -EBUSY; if (__ratelimit(&migrate_rs)) { pr_warn("failed to isolate pfn %lx\n", pfn); dump_page(page, "isolation failed"); diff --git a/mm/migrate.c b/mm/migrate.c index 2db546a0618c..9a101c7bb8ff 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -58,7 +58,7 @@ =20 #include "internal.h" =20 -int isolate_movable_page(struct page *page, isolate_mode_t mode) +bool isolate_movable_page(struct page *page, isolate_mode_t mode) { struct folio *folio =3D folio_get_nontail_page(page); const struct movable_operations *mops; @@ -119,14 +119,14 @@ int isolate_movable_page(struct page *page, isolate_m= ode_t mode) folio_set_isolated(folio); folio_unlock(folio); =20 - return 0; + return true; =20 out_no_isolated: folio_unlock(folio); out_putfolio: folio_put(folio); out: - return -EBUSY; + return false; } =20 static void putback_movable_folio(struct folio *folio) --=20 2.27.0