linux-kernel - [PATCH] mm/cma.c: Switch to bitmap_zalloc() for cma bitmap allocation

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Date:   Mon, 7 Oct 2019 14:57:03 +0800
From:   Yunfeng Ye <yeyunfeng@...wei.com>
To:     <akpm@...ux-foundation.org>, <rppt@...ux.ibm.com>,
        <huyue2@...ong.com>, <peng.fan@....com>, <aryabinin@...tuozzo.com>,
        <ryh.szk.cmnty@...il.com>, <andreyknvl@...gle.com>,
        <opendmb@...il.com>, <tglx@...utronix.de>
CC:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm/cma.c: Switch to bitmap_zalloc() for cma bitmap allocation

kzalloc() is used for cma bitmap allocation in cma_activate_area(),
switch to bitmap_zalloc() is more clearly.

Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
---
 mm/cma.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/mm/cma.c b/mm/cma.c
index 7fe0b83..be55d19 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -95,13 +95,11 @@ static void cma_clear_bitmap(struct cma *cma, unsigned long pfn,

 static int __init cma_activate_area(struct cma *cma)
 {
-	int bitmap_size = BITS_TO_LONGS(cma_bitmap_maxno(cma)) * sizeof(long);
 	unsigned long base_pfn = cma->base_pfn, pfn = base_pfn;
 	unsigned i = cma->count >> pageblock_order;
 	struct zone *zone;

-	cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
-
+	cma->bitmap = bitmap_zalloc(cma_bitmap_maxno(cma), GFP_KERNEL);
 	if (!cma->bitmap) {
 		cma->count = 0;
 		return -ENOMEM;
@@ -139,7 +137,7 @@ static int __init cma_activate_area(struct cma *cma)

 not_in_zone:
 	pr_err("CMA area %s could not be activated\n", cma->name);
-	kfree(cma->bitmap);
+	bitmap_free(cma->bitmap);
 	cma->count = 0;
 	return -EINVAL;
 }
-- 
2.7.4