[PATCH] mm: compaction: update comment about zone lock in isolate_freepages_block

[Jerome Marchand <jmarchan@redhat.com>]

Since commit f40d1e4 (mm: compaction: acquire the zone->lock as late as
possible), isolate_freepages_block() takes the zone->lock itself. The
function description however still states that the zone->lock must be
held.
This patch removes this outdated statement.

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
---
 mm/compaction.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 05ccb4c..9f9026f 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -235,10 +235,9 @@ static bool suitable_migration_target(struct page *page)
 }
 
 /*
- * Isolate free pages onto a private freelist. Caller must hold zone->lock.
- * If @strict is true, will abort returning 0 on any invalid PFNs or non-free
- * pages inside of the pageblock (even though it may still end up isolating
- * some pages).
+ * Isolate free pages onto a private freelist. If @strict is true, will abort
+ * returning 0 on any invalid PFNs or non-free pages inside of the pageblock
+ * (even though it may still end up isolating some pages).
  */
 static unsigned long isolate_freepages_block(struct compact_control *cc,
 				unsigned long blockpfn,
-- 
1.7.7.6

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