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().

[hca@linux.ibm.com: get rid of all temp variables]
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3786
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230117060223.58583-1-jiapeng.chong@linux.alibaba.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
index 78d7768f93d75001a0e20b69b137ff064aaaeec1..15daf777cf419f5fc6c70a2f76e701137138473e 100644 (file)
--- 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);
 }
 
 /*