linux-kernel - [PATCH] selftests/mm: Fix compiler -Wmaybe-uninitialized warning

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Message-Id: <20250409095006.1422620-1-anshuman.khandual@arm.com>
Date: Wed,  9 Apr 2025 15:20:06 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-mm@...ck.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Shuah Khan <shuah@...nel.org>,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] selftests/mm: Fix compiler -Wmaybe-uninitialized warning

Following build warning comes up for cow test as 'transferred' variable has
not been initialized. Fix the warning via zero init for the variable.

  CC       cow
cow.c: In function ‘do_test_vmsplice_in_parent’:
cow.c:365:61: warning: ‘transferred’ may be used uninitialized [-Wmaybe-uninitialized]
  365 |                 cur = read(fds[0], new + total, transferred - total);
      |                                                 ~~~~~~~~~~~~^~~~~~~
cow.c:296:29: note: ‘transferred’ was declared here
  296 |         ssize_t cur, total, transferred;
      |                             ^~~~~~~~~~~
  CC       compaction_test
  CC       gup_longterm

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Shuah Khan <shuah@...nel.org>
Cc: linux-mm@...ck.org
Cc: linux-kselftest@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 tools/testing/selftests/mm/cow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/mm/cow.c b/tools/testing/selftests/mm/cow.c
index f0cb14ea8608..b6cfe0a4b7df 100644
--- a/tools/testing/selftests/mm/cow.c
+++ b/tools/testing/selftests/mm/cow.c
@@ -293,7 +293,7 @@ static void do_test_vmsplice_in_parent(char *mem, size_t size,
 		.iov_base = mem,
 		.iov_len = size,
 	};
-	ssize_t cur, total, transferred;
+	ssize_t cur, total, transferred = 0;
 	struct comm_pipes comm_pipes;
 	char *old, *new;
 	int ret, fds[2];
-- 
2.43.0