linux-kernel - [PATCH] selftests: vm: remove duplicated macro and use swap() to make code cleaner

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Message-Id: <20220301014404.2052655-1-lv.ruyi@zte.com.cn>
Date:   Tue,  1 Mar 2022 01:44:04 +0000
From:   cgel.zte@...il.com
To:     akpm@...ux-foundation.org
Cc:     shuah@...nel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Lv Ruyi (CGEL ZTE)" <lv.ruyi@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] selftests: vm: remove duplicated macro and use swap() to make code cleaner

From: "Lv Ruyi (CGEL ZTE)" <lv.ruyi@....com.cn>

The macro is duplicated, so remove one. And use swap to make code cleaner.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi (CGEL ZTE) <lv.ruyi@....com.cn>
---
 tools/testing/selftests/vm/userfaultfd.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index ab394e6bff43..100f08362164 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -121,9 +121,6 @@ struct uffd_stats {
 #define swap(a, b) \
 	do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
 
-#define swap(a, b) \
-	do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
-
 const char *examples =
     "# Run anonymous memory test on 100MiB region with 99999 bounces:\n"
     "./userfaultfd anon 100 99999\n\n"
@@ -1424,7 +1421,6 @@ static void userfaultfd_pagemap_test(unsigned int test_pgsize)
 static int userfaultfd_stress(void)
 {
 	void *area;
-	char *tmp_area;
 	unsigned long nr;
 	struct uffdio_register uffdio_register;
 	struct uffd_stats uffd_stats[nr_cpus];
@@ -1535,13 +1531,8 @@ static int userfaultfd_stress(void)
 					    count_verify[nr], nr);
 
 		/* prepare next bounce */
-		tmp_area = area_src;
-		area_src = area_dst;
-		area_dst = tmp_area;
-
-		tmp_area = area_src_alias;
-		area_src_alias = area_dst_alias;
-		area_dst_alias = tmp_area;
+		swap(area_src, area_dst);
+		swap(area_src_alias, area_dst_alias);
 
 		uffd_stats_report(uffd_stats, nr_cpus);
 	}
-- 
2.25.1