mm: page_alloc: simplify drain_zone_pages by using min()

Instead of open-coding getting minimal value of two, just use min macro.
That is why it is there for.  While changing the function also change
type of batch local variable to match type of per_cpu_pages::batch
(which is int).

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8c4f1b220ab969fe9bc1c1c5ef5670b24fc73be8..c1c6cb78e5cae282d37fe69054698b633e98ccee 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1257,15 +1257,11 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
 void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
 {
        unsigned long flags;
-       int to_drain;
-       unsigned long batch;
+       int to_drain, batch;
 
        local_irq_save(flags);
        batch = ACCESS_ONCE(pcp->batch);
-       if (pcp->count >= batch)
-               to_drain = batch;
-       else
-               to_drain = pcp->count;
+       to_drain = min(pcp->count, batch);
        if (to_drain > 0) {
                free_pcppages_bulk(zone, to_drain, pcp);
                pcp->count -= to_drain;