linux-kernel - [PATCH] mm-cma-add-functions-to-get-region-pages-counters-fix-2

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Date:	Tue, 07 Apr 2015 00:31:46 +0300
From:	Stefan Strogin <stefan.strogin@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Stefan Strogin <stefan.strogin@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Stefan Strogin <s.strogin@...tner.samsung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Dmitry Safonov <d.safonov@...tner.samsung.com>,
	Pintu Kumar <pintu.k@...sung.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Weijie Yang <weijie.yang@...sung.com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Michal Hocko <mhocko@...e.cz>,
	Vyacheslav Tyrtov <v.tyrtov@...sung.com>,
	Aleksei Mateosian <a.mateosian@...sung.com>
Subject: [PATCH] mm-cma-add-functions-to-get-region-pages-counters-fix-2

Move the code from cma_get_used() and cma_get_maxchunk() to cma_used_get()
and cma_maxchunk_get(), because cma_get_*() aren't used anywhere else, and
because of their confusing similar names.

Signed-off-by: Stefan Strogin <stefan.strogin@...il.com>
---
 mm/cma_debug.c | 51 ++++++++++++++++++---------------------------------
 1 file changed, 18 insertions(+), 33 deletions(-)

diff --git a/mm/cma_debug.c b/mm/cma_debug.c
index 56c4175..abb9d0b 100644
--- a/mm/cma_debug.c
+++ b/mm/cma_debug.c
@@ -22,37 +22,6 @@ struct cma_mem {
 
 static struct dentry *cma_debugfs_root;
 
-static unsigned long cma_get_used(struct cma *cma)
-{
-	unsigned long ret = 0;
-
-	mutex_lock(&cma->lock);
-	/* pages counter is smaller than sizeof(int) */
-	ret = bitmap_weight(cma->bitmap, (int)cma->count);
-	mutex_unlock(&cma->lock);
-
-	return ret << cma->order_per_bit;
-}
-
-static unsigned long cma_get_maxchunk(struct cma *cma)
-{
-	unsigned long maxchunk = 0;
-	unsigned long start, end = 0;
-
-	mutex_lock(&cma->lock);
-	for (;;) {
-		start = find_next_zero_bit(cma->bitmap, cma->count, end);
-		if (start >= cma->count)
-			break;
-		end = find_next_bit(cma->bitmap, cma->count, start);
-		maxchunk = max(end - start, maxchunk);
-	}
-	mutex_unlock(&cma->lock);
-
-	return maxchunk << cma->order_per_bit;
-}
-
-
 static int cma_debugfs_get(void *data, u64 *val)
 {
 	unsigned long *p = data;
@@ -66,8 +35,13 @@ DEFINE_SIMPLE_ATTRIBUTE(cma_debugfs_fops, cma_debugfs_get, NULL, "%llu\n");
 static int cma_used_get(void *data, u64 *val)
 {
 	struct cma *cma = data;
+	unsigned long used;
 
-	*val = cma_get_used(cma);
+	mutex_lock(&cma->lock);
+	/* pages counter is smaller than sizeof(int) */
+	used = bitmap_weight(cma->bitmap, (int)cma->count);
+	mutex_unlock(&cma->lock);
+	*val = used << cma->order_per_bit;
 
 	return 0;
 }
@@ -76,8 +50,19 @@ DEFINE_SIMPLE_ATTRIBUTE(cma_used_fops, cma_used_get, NULL, "%llu\n");
 static int cma_maxchunk_get(void *data, u64 *val)
 {
 	struct cma *cma = data;
+	unsigned long maxchunk = 0;
+	unsigned long start, end = 0;
 
-	*val = cma_get_maxchunk(cma);
+	mutex_lock(&cma->lock);
+	for (;;) {
+		start = find_next_zero_bit(cma->bitmap, cma->count, end);
+		if (start >= cma->count)
+			break;
+		end = find_next_bit(cma->bitmap, cma->count, start);
+		maxchunk = max(end - start, maxchunk);
+	}
+	mutex_unlock(&cma->lock);
+	*val = maxchunk << cma->order_per_bit;
 
 	return 0;
 }
-- 
2.1.0

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