linux-kernel - [PATCH v2 02/25] mm: Optimise find

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200212041845.25879-3-willy@infradead.org>
Date:   Tue, 11 Feb 2020 20:18:22 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 02/25] mm: Optimise find_subpage for !THP

From: "Matthew Wilcox (Oracle)" <willy@...radead.org>

If THP is disabled, find_subpage can become a no-op.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/pagemap.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 75bdfec49710..0842622cca90 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -340,7 +340,7 @@ static inline struct page *find_subpage(struct page *page, pgoff_t offset)
 
 	VM_BUG_ON_PAGE(PageTail(page), page);
 
-	return page + (offset & (compound_nr(page) - 1));
+	return page + (offset & (hpage_nr_pages(page) - 1));
 }
 
 struct page *find_get_entry(struct address_space *mapping, pgoff_t offset);
-- 
2.25.0