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

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On 2/28/22 6:44 PM, cgel.zte@xxxxxxxxx wrote:
From: "Lv Ruyi (CGEL ZTE)" <lv.ruyi@xxxxxxxxxx>

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

Reported-by: Zeal Robot <zealci@xxxxxxxxxx>
Signed-off-by: Lv Ruyi (CGEL ZTE) <lv.ruyi@xxxxxxxxxx>
---
  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);

Where is swap() defined? Does this patch compile? I reverted a
change like this one reported by Zeal Robot recently. Let's
make sure this change compiles and runs.

uffd_stats_report(uffd_stats, nr_cpus);
  	}


thanks,
-- Shuah



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