From: Andrew Morton <akpm@linux-foundation.org>
Date: Thu, 22 May 2014 00:42:44 +0000 (+1000)
Subject: mm/compaction.c:isolate_freepages_block(): small tuneup
X-Git-Tag: next-20140530~2^2~380
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d19c07769a0242ce1aef06f40059f95d251cb0d4;p=karo-tx-linux.git

mm/compaction.c:isolate_freepages_block(): small tuneup

- remove unneeded `continue'

- expand the scope if the `if (isloated)' test, to optimise a code path
  which is rarely actualyl taken.

Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Laura Abbott <lauraa@codeaurora.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/compaction.c b/mm/compaction.c
index 627dc2e4320f..73a2daefba47 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -293,14 +293,14 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 
 		/* Found a free page, break it into order-0 pages */
 		isolated = split_free_page(page);
-		total_isolated += isolated;
-		for (i = 0; i < isolated; i++) {
-			list_add(&page->lru, freelist);
-			page++;
-		}
-
-		/* If a page was split, advance to the end of it */
 		if (isolated) {
+			total_isolated += isolated;
+			for (i = 0; i < isolated; i++) {
+				list_add(&page->lru, freelist);
+				page++;
+			}
+
+			/* If a page was split, advance to the end of it */
 			blockpfn += isolated - 1;
 			cursor += isolated - 1;
 			continue;
@@ -309,9 +309,6 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 isolate_fail:
 		if (strict)
 			break;
-		else
-			continue;
-
 	}
 
 	trace_mm_compaction_isolate_freepages(nr_scanned, total_isolated);