linux-kernel - Re: [PATCH] mm: huge_memory: Replace obsolete memalign() with posix

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Date:   Wed, 12 Apr 2023 10:27:10 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Deming Wang <wangdeming@...pur.com>, akpm@...ux-foundation.org,
        shuah@...nel.org
Cc:     linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: huge_memory: Replace obsolete memalign() with
 posix_memalign()

On 12.04.23 09:49, Deming Wang wrote:
> memalign() is obsolete according to its manpage.
> 
> Replace memalign() with posix_memalign() and remove malloc.h include
> that was there for memalign().

Comment does not apply.

> 
> As a pointer is passed into posix_memalign(), initialize *p to NULL
> to silence a warning about the function's return value being used as
> uninitialized (which is not valid anyway because the error is properly
> checked before p is returned).

Comment does not apply.

> 
> Signed-off-by: Deming Wang <wangdeming@...pur.com>
> ---
>   tools/testing/selftests/mm/split_huge_page_test.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c
> index cbb5e6893cbf..8f48f07bc821 100644
> --- a/tools/testing/selftests/mm/split_huge_page_test.c
> +++ b/tools/testing/selftests/mm/split_huge_page_test.c
> @@ -96,10 +96,10 @@ void split_pmd_thp(void)
>   	char *one_page;
>   	size_t len = 4 * pmd_pagesize;
>   	size_t i;
> +	int ret;
>   
> -	one_page = memalign(pmd_pagesize, len);
> -
> -	if (!one_page) {
> +	ret = posix_memalign((void **)(&one_page), pmd_pagesize, len);

ret = posix_memalign((void **)&one_page, pmd_pagesize, len);

Should do.

> +	if (ret < 0) {
>   		printf("Fail to allocate memory\n");
>   		exit(EXIT_FAILURE);
>   	}

-- 
Thanks,

David / dhildenb