x86/unwind/orc: 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/x86/kernel/unwind_orc.c:235:16-17: WARNING opportunity for swap().

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=4641
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/20230330020014.40489-1-jiapeng.chong@linux.alibaba.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
index 3ac50b7298d15a82114663effa26cf8c13d99a8a..5fbcb229f707efd934b90c7196e04858994e99c1 100644 (file)
--- a/arch/x86/kernel/unwind_orc.c
+++ b/arch/x86/kernel/unwind_orc.c
@@ -219,7 +219,6 @@ static struct orc_entry *cur_orc_table = __start_orc_unwind;
 static void orc_sort_swap(void *_a, void *_b, int size)
 {
        struct orc_entry *orc_a, *orc_b;
-       struct orc_entry orc_tmp;
        int *a = _a, *b = _b, tmp;
        int delta = _b - _a;
 
@@ -231,9 +230,7 @@ static void orc_sort_swap(void *_a, void *_b, int size)
        /* Swap the corresponding .orc_unwind entries: */
        orc_a = cur_orc_table + (a - cur_orc_ip_table);
        orc_b = cur_orc_table + (b - cur_orc_ip_table);
-       orc_tmp = *orc_a;
-       *orc_a = *orc_b;
-       *orc_b = orc_tmp;
+       swap(*orc_a, *orc_b);
 }
 
 static int orc_sort_cmp(const void *_a, const void *_b)