linux-kernel - [PATCH] filemap: remove obsolete comment in lock

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Message-ID: <20220402062218.30709-1-linmiaohe@huawei.com>
Date:   Sat, 2 Apr 2022 14:22:18 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>
CC:     <willy@...radead.org>, <dhowells@...hat.com>,
        <william.kucharski@...cle.com>, <vbabka@...e.cz>,
        <kirill.shutemov@...ux.intel.com>, <hannes@...xchg.org>,
        <agruenba@...hat.com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>, <linmiaohe@...wei.com>
Subject: [PATCH] filemap: remove obsolete comment in lock_page

lock_page needs the caller to have a reference on the page->mapping inode
due to sync_page. Also lock_page_nosync is introduced which does not do a
sync_page via commit db37648cd6ce ("[PATCH] mm: non syncing lock_page()").
But commit 7eaceaccab5f ("block: remove per-queue plugging") kills off the
old plugging along with aops->sync_page() and lock_page_nosync. So there
is no need to have a reference on the page->mapping inode when calling
lock_page anymore. Remove this obsolete and confusing comment.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 include/linux/pagemap.h | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 993994cd943a..8dfe8e49c427 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -908,9 +908,6 @@ static inline void folio_lock(struct folio *folio)
 		__folio_lock(folio);
 }

-/*
- * lock_page may only be called if we have the page's inode pinned.
- */
 static inline void lock_page(struct page *page)
 {
 	struct folio *folio;
-- 
2.23.0