The patch titled
Subject: selftests/damon: fix unnecessary compilation warnings
has been added to the -mm mm-unstable branch. Its filename is
selftests-damon-fix-unnecessary-compilation-warnings.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-damon-fix-unnecessary-compilation-warnings.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Rong Tao <rongtao@xxxxxxxx>
Subject: selftests/damon: fix unnecessary compilation warnings
Date: Sun, 13 Nov 2022 08:38:45 +0800
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;a=commit;h=d14c547abd484d3540b692bb8048c4a6efe92c8b
Link: https://lkml.kernel.org/r/tencent_51C4ACA8CB3895C2D7F35178440283602107@xxxxxx
Signed-off-by: Rong Tao <rongtao@xxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/damon/huge_count_read_write.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/tools/testing/selftests/damon/huge_count_read_write.c~selftests-damon-fix-unnecessary-compilation-warnings
+++ a/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 *fi
close(filedesc);
}
+#pragma GCC diagnostic pop
+
int main(int argc, char *argv[])
{
if (argc != 2) {
_
Patches currently in -mm which might be from rongtao@xxxxxxxx are
tools-vm-page_owner-ignore-page_owner_sort-binary.patch
selftests-damon-fix-unnecessary-compilation-warnings.patch
radix-tree-test-suite-fix-uninitialized-variable-compilation-warning.patch
