linux-kernel - Re: [PATCH 03/12] selftests/mm: fix unused variable warning in migration.c

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Message-ID: <075c6a32-3829-b7fe-685e-0c19851788eb@redhat.com>
Date:   Fri, 2 Jun 2023 12:02:01 +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 03/12] selftests/mm: fix unused variable warning in
 migration.c

On 02.06.23 03:33, John Hubbard wrote:
> Declare the variable as volatile, in order to avoid the clang compiler
> warning.
> 
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>   tools/testing/selftests/mm/migration.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/mm/migration.c b/tools/testing/selftests/mm/migration.c
> index 1cec8425e3ca..2dede662ff43 100644
> --- a/tools/testing/selftests/mm/migration.c
> +++ b/tools/testing/selftests/mm/migration.c
> @@ -95,7 +95,7 @@ int migrate(uint64_t *ptr, int n1, int n2)
>   
>   void *access_mem(void *ptr)
>   {
> -	uint64_t y = 0;
> +	volatile uint64_t y = 0;
>   	volatile uint64_t *x = ptr;
>   
>   	while (1) {

Same comment as for previous patch.

-- 
Thanks,

David / dhildenb