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.
The motivation for this patch is to eliminate the compilation warning, maybe one day we will compile the kernel with "-Werror -Wall", at which point this compilation warning will turn into a compilation error, we should fix this error in advance.
How to reproduce the problem (with gcc-11.3.1):
$ 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=]
"-Wno-stringop-overread" is supported at least in gcc-11.1.0.
Link: https://gcc.gnu.org/git/?p=gcc.git%3Ba=commit%3Bh=d14c547abd484d3540b692bb80... Signed-off-by: Rong Tao rongtao@cestc.cn --- tools/testing/selftests/damon/huge_count_read_write.c | 9 +++++++++ 1 file changed, 9 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..a6fe0689f88d 100644 --- a/tools/testing/selftests/damon/huge_count_read_write.c +++ b/tools/testing/selftests/damon/huge_count_read_write.c @@ -8,6 +8,13 @@ #include <unistd.h> #include <stdio.h>
+#pragma GCC diagnostic push +#if __GNUC__ >= 11 && __GNUC_MINOR__ >= 1 +/* Ignore read(2) overflow and write(2) overread compile warnings */ +#pragma GCC diagnostic ignored "-Wstringop-overread" +#pragma GCC diagnostic ignored "-Wstringop-overflow" +#endif + void write_read_with_huge_count(char *file) { int filedesc = open(file, O_RDWR); @@ -27,6 +34,8 @@ void write_read_with_huge_count(char *file) close(filedesc); }
+#pragma GCC diagnostic pop + int main(int argc, char *argv[]) { if (argc != 2) {