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From:   Rong Tao <rtoax@foxmail.com>
To:     sj@kernel.org
Cc:     damon@lists.linux.dev, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org, linux-mm@kvack.org,
        rongtao@cestc.cn, rtoax@foxmail.com, shuah@kernel.org,
        yuanchu@google.com
Subject: [PATCH] selftests/damon: Fix unnecessary compilation warnings
Date:   Fri, 11 Nov 2022 10:37:20 +0800
In-Reply-To: <20221110200939.101886-1-sj@kernel.org>
References: <20221110200939.101886-1-sj@kernel.org>
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From: Rong Tao <rongtao@cestc.cn>

When testing overflow and overread, there is no need to keep unnecessary
compilation warnings, we should simply ignore them.

How to reproduce the problem:

    $ make -C tools/testing/selftests/
    ...
    warning: ‘write’ reading 4294967295 bytes from a region of size 1
    [-Wstringop-overread]
    warning: ‘read’ writing 4294967295 bytes into a region of size 25
    overflows the destination [-Wstringop-overflow=]

Signed-off-by: Rong Tao <rongtao@cestc.cn>
---
 tools/testing/selftests/damon/huge_count_read_write.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/damon/huge_count_read_write.c b/tools/testing/selftests/damon/huge_count_read_write.c
index ad7a6b4cf338..8fbe276870e7 100644
--- a/tools/testing/selftests/damon/huge_count_read_write.c
+++ b/tools/testing/selftests/damon/huge_count_read_write.c
@@ -8,6 +8,11 @@
 #include <unistd.h>
 #include <stdio.h>
 
+#pragma GCC diagnostic push
+/* Ignore read(2) overflow and write(2) overread compile warnings */
+#pragma GCC diagnostic ignored "-Wstringop-overread"
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
+
 void write_read_with_huge_count(char *file)
 {
 	int filedesc = open(file, O_RDWR);
@@ -27,6 +32,8 @@ void write_read_with_huge_count(char *file)
 	close(filedesc);
 }
 
+#pragma GCC diagnostic pop
+
 int main(int argc, char *argv[])
 {
 	if (argc != 2) {
-- 
2.31.1