linux-kernel - [PATCH] userfaultfd/selftests: fix uninitialized

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Date:   Fri,  4 Mar 2022 16:23:32 +0800
From:   Guo Zhengkui <guozhengkui@...o.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        linux-mm@...ck.org (open list:MEMORY MANAGEMENT),
        linux-kselftest@...r.kernel.org (open list:KERNEL SELFTEST FRAMEWORK),
        linux-kernel@...r.kernel.org (open list)
Cc:     Guo Zhengkui <guozhengkui@...o.com>
Subject: [PATCH] userfaultfd/selftests: fix uninitialized_var.cocci warning

fix following coccicheck warning:
tools/testing/selftests/vm/userfaultfd.c:556:23-24:
WARNING this kind of initialization is deprecated

`unsigned long page_nr = *(&page_nr)` has the same form of
uninitialized_var() macro. I remove the redundant assignement. It has
been tested with gcc (Debian 8.3.0-6) 8.3.0.

The patch which removed uninitialized_var() is:
https://lore.kernel.org/all/20121028102007.GA7547@gmail.com/
And there is very few "/* GCC */" comments in the Linux kernel code now.

Signed-off-by: Guo Zhengkui <guozhengkui@...o.com>
---
 tools/testing/selftests/vm/userfaultfd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index fe404398c65a..203c4a2c2109 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -553,7 +553,7 @@ static void continue_range(int ufd, __u64 start, __u64 len)
 static void *locking_thread(void *arg)
 {
 	unsigned long cpu = (unsigned long) arg;
-	unsigned long page_nr = *(&(page_nr)); /* uninitialized warning */
+	unsigned long page_nr;
 	unsigned long long count;
 
 	if (!(bounces & BOUNCE_RANDOM)) {
-- 
2.20.1