linux-kernel - Re: [PATCH 04/12] selftests/mm: fix a char* assignment in mlock2-tests.c

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Date:   Fri, 2 Jun 2023 12:04:57 +0200
From:   David Hildenbrand <david@...hat.com>
To:     John Hubbard <jhubbard@...dia.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Peter Xu <peterx@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/12] selftests/mm: fix a char* assignment in
 mlock2-tests.c

On 02.06.23 03:33, John Hubbard wrote:
> The stop variable is a char*, so use "\0" when assigning to it, rather
> than attempting to assign a character type. This was generating a
> warning when compiling with clang.
> 
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>   tools/testing/selftests/mm/mlock2-tests.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/mm/mlock2-tests.c b/tools/testing/selftests/mm/mlock2-tests.c
> index 11b2301f3aa3..8ee95077dc25 100644
> --- a/tools/testing/selftests/mm/mlock2-tests.c
> +++ b/tools/testing/selftests/mm/mlock2-tests.c
> @@ -50,7 +50,7 @@ static int get_vm_area(unsigned long addr, struct vm_boundaries *area)
>   			printf("cannot parse /proc/self/maps\n");
>   			goto out;
>   		}
> -		stop = '\0';
> +		stop = "\0";
>   
>   		sscanf(line, "%lx", &start);
>   		sscanf(end_addr, "%lx", &end);


I'm probably missing something, but what is the stop variable supposed 
to do here? It's completely unused, no?

if (!strchr(end_addr, ' ')) {
	printf("cannot parse /proc/self/maps\n");
	goto out;
}

-- 
Thanks,

David / dhildenb