linux-kernel - [PATCH v2] mm/mm_init: use helper macro BITS_PER_LONG and BITS_PER

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Message-ID: <20230807023247.308414-1-linmiaohe@huawei.com>
Date:   Mon, 7 Aug 2023 10:32:47 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <akpm@...ux-foundation.org>, <rppt@...nel.org>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH v2] mm/mm_init: use helper macro BITS_PER_LONG and BITS_PER_BYTE

It's more readable to use helper macro BITS_PER_LONG and BITS_PER_BYTE.
No functional change intended.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
v2:
  use BITS_PER_BYTE per Mike. Thanks.
---
 mm/mm_init.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 66aca3f6accd..93b1febd4a32 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -79,7 +79,7 @@ void __init mminit_verify_pageflags_layout(void)
 	int shift, width;
 	unsigned long or_mask, add_mask;
 
-	shift = 8 * sizeof(unsigned long);
+	shift = BITS_PER_LONG;
 	width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH
 		- LAST_CPUPID_SHIFT - KASAN_TAG_WIDTH - LRU_GEN_WIDTH - LRU_REFS_WIDTH;
 	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
@@ -1431,9 +1431,9 @@ static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned l
 	usemapsize = roundup(zonesize, pageblock_nr_pages);
 	usemapsize = usemapsize >> pageblock_order;
 	usemapsize *= NR_PAGEBLOCK_BITS;
-	usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long));
+	usemapsize = roundup(usemapsize, BITS_PER_LONG);
 
-	return usemapsize / 8;
+	return usemapsize / BITS_PER_BYTE;
 }
 
 static void __ref setup_usemap(struct zone *zone)
-- 
2.33.0