zsmalloc: use class->pages_per_zspage

There is no need to recalcurate pages_per_zspage in runtime.  Just use
class->pages_per_zspage to avoid unnecessary runtime overhead.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index c10885ca87a4..ce08d043becd 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -1723,7 +1723,7 @@ static unsigned long zs_can_compact(struct size_class *class)
         obj_wasted /= get_maxobj_per_zspage(class->size,
                         class->pages_per_zspage);
 
-        return obj_wasted * get_pages_per_zspage(class->size);
+        return obj_wasted * class->pages_per_zspage;
 }
 
 static void __zs_compact(struct zs_pool *pool, struct size_class *class)
@@ -1761,8 +1761,7 @@ static void __zs_compact(struct zs_pool *pool, struct size_class *class)
 
                 putback_zspage(pool, class, dst_page);
                 if (putback_zspage(pool, class, src_page) == ZS_EMPTY)
-                        pool->stats.pages_compacted +=
-                                get_pages_per_zspage(class->size);
+                        pool->stats.pages_compacted += class->pages_per_zspage;
                 spin_unlock(&class->lock);
                 cond_resched();
                 spin_lock(&class->lock);