[PATCH v2 4/5] mm/mm_init: use min() when adjusting for ZONE_MOVABLE

[Sang-Heon Jeon]

Outside the ZONE_MOVABLE branch, the two branches set *zone_start_pfn
and *zone_end_pfn as follows.

1. If *zone_start_pfn < zone_movable_pfn[nid], *zone_end_pfn ends up as
   min(*zone_end_pfn, zone_movable_pfn[nid]).

   a. If *zone_end_pfn > zone_movable_pfn[nid], *zone_end_pfn =
      zone_movable_pfn[nid].

   b. If *zone_end_pfn <= zone_movable_pfn[nid], *zone_end_pfn is
      unchanged.

2. Else *zone_start_pfn >= zone_movable_pfn[nid] and the whole range is
   within ZONE_MOVABLE, so *zone_start_pfn = *zone_end_pfn.

So use min() to simplify the conditions.

No functional change.

Signed-off-by: Sang-Heon Jeon <ekffu200098@xxxxxxxxx>
---
 mm/mm_init.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index fa6b5977261f..27f454edbebb 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -1213,14 +1213,14 @@ static unsigned long __init zone_spanned_pages_in_node(int nid,
 			/* Move the zone start inside the node if necessary */
 			*zone_start_pfn = max(*zone_start_pfn, node_start_pfn);
 
-		/* Adjust for ZONE_MOVABLE starting within this range */
-		} else if (*zone_start_pfn < zone_movable_pfn[nid] &&
-			   *zone_end_pfn > zone_movable_pfn[nid]) {
-			*zone_end_pfn = zone_movable_pfn[nid];
+		/* This range starts below ZONE_MOVABLE */
+		} else if (*zone_start_pfn < zone_movable_pfn[nid]) {
+			*zone_end_pfn = min(*zone_end_pfn, zone_movable_pfn[nid]);
 
-		/* Check if this whole range is within ZONE_MOVABLE */
-		} else if (*zone_start_pfn >= zone_movable_pfn[nid])
+		/* This whole range is within ZONE_MOVABLE */
+		} else {
 			*zone_start_pfn = *zone_end_pfn;
+		}
 	}
 
 	/* Return the spanned pages */
-- 
2.43.0