mm, pagevec: rename pagevec drained field

According to Vlastimil Babka, the drained field in pagevec is
potentially misleading because it might be interpreted as draining this
pagevec instead of the percpu lru pagevecs.  Rename the field for
clarity.

Link: http://lkml.kernel.org/r/20171019093346.ylahzdpzmoriyf4v@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Suggested-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 4 insertions, 4 deletions

diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
index eebefd209424..5fb6580f7f23 100644
--- a/include/linux/pagevec.h
+++ b/include/linux/pagevec.h
@@ -17,7 +17,7 @@ struct address_space;
 
 struct pagevec {
         unsigned long nr;
-        bool drained;
+        bool percpu_pvec_drained;
         struct page *pages[PAGEVEC_SIZE];
 };
 
@@ -53,7 +53,7 @@ static inline unsigned pagevec_lookup_tag(struct pagevec *pvec,
 static inline void pagevec_init(struct pagevec *pvec)
 {
         pvec->nr = 0;
-        pvec->drained = false;
+        pvec->percpu_pvec_drained = false;
 }
 
 static inline void pagevec_reinit(struct pagevec *pvec)
diff --git a/mm/swap.c b/mm/swap.c
index b480279c760c..38e1b6374a97 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -833,9 +833,9 @@ EXPORT_SYMBOL(release_pages);
  */
 void __pagevec_release(struct pagevec *pvec)
 {
-        if (!pvec->drained) {
+        if (!pvec->percpu_pvec_drained) {
                 lru_add_drain();
-                pvec->drained = true;
+                pvec->percpu_pvec_drained = true;
         }
         release_pages(pvec->pages, pagevec_count(pvec));
         pagevec_reinit(pvec);