linux-kernel - [PATCH 3.16 160/212] f2fs: use for_each_set

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Date:   Thu, 01 Jun 2017 16:43:16 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Jaegeuk Kim" <jaegeuk@...nel.org>,
        "Chao Yu" <chao2.yu@...sung.com>
Subject: [PATCH 3.16 160/212] f2fs: use for_each_set_bit to simplify the code

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Chao Yu <chao2.yu@...sung.com>

commit b65ee14818e67127aa242fe1dbd3711b9c095cc0 upstream.

This patch uses for_each_set_bit to simplify some codes in f2fs.

Signed-off-by: Chao Yu <chao2.yu@...sung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/f2fs/gc.c      |  7 ++-----
 fs/f2fs/segment.c | 13 ++++---------
 2 files changed, 6 insertions(+), 14 deletions(-)

--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -186,7 +186,6 @@ static unsigned int get_max_cost(struct
 static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
 {
 	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
-	unsigned int hint = 0;
 	unsigned int secno;
 
 	/*
@@ -194,11 +193,9 @@ static unsigned int check_bg_victims(str
 	 * selected by background GC before.
 	 * Those segments guarantee they have small valid blocks.
 	 */
-next:
-	secno = find_next_bit(dirty_i->victim_secmap, TOTAL_SECS(sbi), hint++);
-	if (secno < TOTAL_SECS(sbi)) {
+	for_each_set_bit(secno, dirty_i->victim_secmap, TOTAL_SECS(sbi)) {
 		if (sec_usage_check(sbi, secno))
-			goto next;
+			continue;
 		clear_bit(secno, dirty_i->victim_secmap);
 		return secno * sbi->segs_per_sec;
 	}
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -437,17 +437,12 @@ static void add_discard_addrs(struct f2f
 static void set_prefree_as_free_segments(struct f2fs_sb_info *sbi)
 {
 	struct dirty_seglist_info *dirty_i = DIRTY_I(sbi);
-	unsigned int segno = -1;
+	unsigned int segno;
 	unsigned int total_segs = TOTAL_SEGS(sbi);
 
 	mutex_lock(&dirty_i->seglist_lock);
-	while (1) {
-		segno = find_next_bit(dirty_i->dirty_segmap[PRE], total_segs,
-				segno + 1);
-		if (segno >= total_segs)
-			break;
+	for_each_set_bit(segno, dirty_i->dirty_segmap[PRE], total_segs)
 		__set_test_and_free(sbi, segno);
-	}
 	mutex_unlock(&dirty_i->seglist_lock);
 }
 
@@ -1532,7 +1527,7 @@ void flush_sit_entries(struct f2fs_sb_in
 	struct page *page = NULL;
 	struct f2fs_sit_block *raw_sit = NULL;
 	unsigned int start = 0, end = 0;
-	unsigned int segno = -1;
+	unsigned int segno;
 	bool flushed;
 
 	mutex_lock(&curseg->curseg_mutex);
@@ -1544,7 +1539,7 @@ void flush_sit_entries(struct f2fs_sb_in
 	 */
 	flushed = flush_sits_in_journal(sbi);
 
-	while ((segno = find_next_bit(bitmap, nsegs, segno + 1)) < nsegs) {
+	for_each_set_bit(segno, bitmap, nsegs) {
 		struct seg_entry *se = get_seg_entry(sbi, segno);
 		int sit_offset, offset;