locking/ww_mutex/test: Use swap() macro

Fixes the following Coccinelle/coccicheck warning reported by
swap.cocci:

  WARNING opportunity for swap()

Compile-tested only.

[Boqun: Add the report tags from Jiapeng and Abaci Robot [1].]

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Reported-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=11531
Link: https://lore.kernel.org/r/20241025081455.55089-1-jiapeng.chong@linux.alibaba.com
Acked-by: Waiman Long <longman@redhat.com>
Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/20240731135850.81018-2-thorsten.blum@toblux.com

diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
index 5d58b2c0ef98bca244345f708a77690b5c0e17e9..bcb1b9fea588077f6f6e371c9cab904be021cd79 100644 (file)
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -404,7 +404,7 @@ static inline u32 prandom_u32_below(u32 ceil)
 static int *get_random_order(int count)
 {
        int *order;
-       int n, r, tmp;
+       int n, r;
 
        order = kmalloc_array(count, sizeof(*order), GFP_KERNEL);
        if (!order)
@@ -415,11 +415,8 @@ static int *get_random_order(int count)
 
        for (n = count - 1; n > 1; n--) {
                r = prandom_u32_below(n + 1);
-               if (r != n) {
-                       tmp = order[n];
-                       order[n] = order[r];
-                       order[r] = tmp;
-               }
+               if (r != n)
+                       swap(order[n], order[r]);
        }
 
        return order;