s390/vmem: use swap() instead of open coding it

Swap is a function interface that provides exchange function. To avoid
code duplication, we can use swap function.

./arch/s390/mm/vmem.c:680:10-11: WARNING opportunity for swap().

[[email protected]: get rid of all temp variables]
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3786
Reported-by: Abaci Robot <[email protected]>
Signed-off-by: Jiapeng Chong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Carstens <[email protected]>

1 files changed, 1 insertions, 7 deletions

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 78d7768f93d7..15daf777cf41 100644
--- a/arch/s390/mm/vmem.c
+++ b/arch/s390/mm/vmem.c
@@ -672,13 +672,7 @@ static int __init memblock_region_cmp(const void *a, const void *b)
 
 static void __init memblock_region_swap(void *a, void *b, int size)
 {
-	struct memblock_region *r1 = a;
-	struct memblock_region *r2 = b;
-	struct memblock_region swap;
-
-	swap = *r1;
-	*r1 = *r2;
-	*r2 = swap;
+	swap(*(struct memblock_region *)a, *(struct memblock_region *)b);
 }
 
 /*