mm/compaction.c: fix warning of 'flags' may be used uninitialized

C      mm/compaction.o
mm/compaction.c: In function isolate_freepages_block:
mm/compaction.c:364:37: warning: flags may be used uninitialized in this function [-Wmaybe-uninitialized]
       && compact_unlock_should_abort(&cc->zone->lock, flags,
                                     ^

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/compaction.c b/mm/compaction.c
index 15163b4b35ab8dda2c4367e9355a4be44f77d31a..b9972c0fd9175e3eaeadc489dca0cde4b8e95eae 100644 (file)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -344,7 +344,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 {
        int nr_scanned = 0, total_isolated = 0;
        struct page *cursor, *valid_page = NULL;
-       unsigned long flags;
+       unsigned long flags = 0;
        bool locked = false;
        unsigned long blockpfn = *start_pfn;
 
@@ -570,7 +570,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
        unsigned long nr_scanned = 0, nr_isolated = 0;
        struct list_head *migratelist = &cc->migratepages;
        struct lruvec *lruvec;
-       unsigned long flags;
+       unsigned long flags = 0;
        bool locked = false;
        struct page *page = NULL, *valid_page = NULL;