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mm, compaction: change COMPACT_ constants into enum

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Compaction code is doing weird dances between COMPACT_FOO -> int ->
unsigned long

But there doesn't seem to be any reason for that.  All functions which
return/use one of those constants are not expecting any other value so it
really makes sense to define an enum for them and make it clear that no
other values are expected.

This is a pure cleanup and shouldn't introduce any functional changes.

Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko
2016-05-20 16:56:38 -07:00
committed by Linus Torvalds
parent b6459cc154
commit ea7ab982b6
3 changed files with 42 additions and 32 deletions
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2
mm/page_alloc.c
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@@ -3188,7 +3188,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
enum migrate_mode mode, int *contended_compaction,
bool *deferred_compaction)
{
unsigned long compact_result;
enum compact_result compact_result;
struct page *page;
if (!order)