Address the following coccicheck warning:

tools/testing/selftests/vm/userfaultfd.c:1536:21-22: WARNING opportunity for swap(). tools/testing/selftests/vm/userfaultfd.c:1540:33-34: WARNING opportunity for swap().

by using swap() for the swapping of variable values and drop `tmp_area` that is not needed any more.

`swap()` macro in userfaultfd.c is introduced in commit 681696862bc18 ("selftests: vm: remove dependecy from internal kernel macros")

It has been tested with gcc (Debian 8.3.0-6) 8.3.0.

Signed-off-by: Guo Zhengkui guozhengkui@vivo.com --- tools/testing/selftests/vm/userfaultfd.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c index 92a4516f8f0d..7aba3ced7545 100644 --- a/tools/testing/selftests/vm/userfaultfd.c +++ b/tools/testing/selftests/vm/userfaultfd.c @@ -1422,7 +1422,6 @@ 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]; @@ -1533,13 +1532,9 @@ static int userfaultfd_stress(void) count_verify[nr], nr);

/* prepare next bounce */ - tmp_area = area_src; - area_src = area_dst; - area_dst = tmp_area; + swap(area_src, area_dst);

- tmp_area = area_src_alias; - area_src_alias = area_dst_alias; - area_dst_alias = tmp_area; + swap(area_src_alias, area_dst_alias);

uffd_stats_report(uffd_stats, nr_cpus); }