linux-kernel - Re: [PATCH RESEND] selftests/damon: add damon to selftests root Makefile

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Date:   Mon, 25 Apr 2022 14:03:05 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Yuanchu Xie <yuanchu@...gle.com>, SeongJae Park <sj@...nel.org>
Cc:     Shuah Khan <shuah@...nel.org>, Markus Boehme <markubo@...zon.de>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH RESEND] selftests/damon: add damon to selftests root
 Makefile

On 4/25/22 1:37 PM, Shuah Khan wrote:
> On 4/24/22 1:35 PM, David Rientjes wrote:
>> On Mon, 18 Apr 2022, Yuanchu Xie wrote:
>>
>>> Currently the damon selftests are not built with the rest of the
>>> selftests. We add damon to the list of targets.
>>>
>>> Fixes: b348eb7abd09 ("mm/damon: add user space selftests")
>>> Reviewed-by: SeongJae Park <sj@...nel.org>
>>> Signed-off-by: Yuanchu Xie <yuanchu@...gle.com>
>>
>> Acked-by: David Rientjes <rientjes@...gle.com>
>>
> 
> Thank you. Applied to linux-kselftest next for 5.19-rc1.
> 

The test builds with warnings. Would you like to fix these as
well?

make
gcc     huge_count_read_write.c  -o linux_5.18/tools/testing/selftests/damon/huge_count_read_write
huge_count_read_write.c: In function ‘write_read_with_huge_count’:
huge_count_read_write.c:23:9: warning: ‘write’ reading 4294967295 bytes from a region of size 1 [-Wstringop-overread]
    23 |         write(filedesc, "", 0xfffffffful);
       |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from huge_count_read_write.c:8:
/usr/include/unistd.h:378:16: note: in a call to function ‘write’ declared with attribute ‘access (read_only, 2, 3)’
   378 | extern ssize_t write (int __fd, const void *__buf, size_t __n) __wur
       |                ^~~~~
huge_count_read_write.c:25:15: warning: ‘read’ writing 4294967295 bytes into a region of size 25 overflows the destination [-Wstringop-overflow=]
    25 |         ret = read(filedesc, buf, 0xfffffffful);
       |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
huge_count_read_write.c:14:14: note: destination object ‘buf’ of size 25
    14 |         char buf[25];
       |              ^~~
In file included from huge_count_read_write.c:8:
/usr/include/unistd.h:371:16: note: in a call to function ‘read’ declared with attribute ‘access (write_only, 2, 3)’
   371 | extern ssize_t read (int __fd, void *__buf, size_t __nbytes) __wur
       |                ^~~~

thanks,
-- Shuah