linux-kernel - [PATCH 2/3] mm: kmsan: use helper macro offset_in

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Message-ID: <20230727011612.2721843-3-zhangpeng362@huawei.com>
Date:   Thu, 27 Jul 2023 09:16:11 +0800
From:   Peng Zhang <zhangpeng362@...wei.com>
To:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
CC:     <glider@...gle.com>, <elver@...gle.com>, <dvyukov@...gle.com>,
        <kasan-dev@...glegroups.com>, <akpm@...ux-foundation.org>,
        <wangkefeng.wang@...wei.com>, <sunnanyong@...wei.com>,
        ZhangPeng <zhangpeng362@...wei.com>
Subject: [PATCH 2/3] mm: kmsan: use helper macro offset_in_page()

From: ZhangPeng <zhangpeng362@...wei.com>

Use helper macro offset_in_page() to improve code readability. No
functional modification involved.

Signed-off-by: ZhangPeng <zhangpeng362@...wei.com>
---
 mm/kmsan/hooks.c  | 2 +-
 mm/kmsan/shadow.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/kmsan/hooks.c b/mm/kmsan/hooks.c
index 4e3c3e60ba97..5d6e2dee5692 100644
--- a/mm/kmsan/hooks.c
+++ b/mm/kmsan/hooks.c
@@ -339,7 +339,7 @@ void kmsan_handle_dma(struct page *page, size_t offset, size_t size,
 	 * internal KMSAN checks.
 	 */
 	while (size > 0) {
-		page_offset = addr % PAGE_SIZE;
+		page_offset = offset_in_page(addr);
 		to_go = min(PAGE_SIZE - page_offset, (u64)size);
 		kmsan_handle_dma_page((void *)addr, to_go, dir);
 		addr += to_go;
diff --git a/mm/kmsan/shadow.c b/mm/kmsan/shadow.c
index c7de991f6d7f..966994268a01 100644
--- a/mm/kmsan/shadow.c
+++ b/mm/kmsan/shadow.c
@@ -145,7 +145,7 @@ void *kmsan_get_metadata(void *address, bool is_origin)
 		return NULL;
 	if (!page_has_metadata(page))
 		return NULL;
-	off = addr % PAGE_SIZE;
+	off = offset_in_page(addr);
 
 	return (is_origin ? origin_ptr_for(page) : shadow_ptr_for(page)) + off;
 }
-- 
2.25.1