linux-kernel - Re: [PATCH] selftests/mm: fix split huge page tests

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Date:   Mon, 6 Mar 2023 10:31:19 -0800
From:   Zach O'Keefe <zokeefe@...gle.com>
To:     Zi Yan <ziy@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH] selftests/mm: fix split huge page tests

On Mar 06 11:09, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> Fixed two inputs to check_anon_huge() and one if condition, so the tests
> work as expected.
> 
> Fixes: c07c343cda8e ("selftests/vm: dedup THP helpers")
> Signed-off-by: Zi Yan <ziy@...dia.com>
> Cc: Zach O'Keefe <zokeefe@...gle.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 76e1c36dd9e5..b8558c7f1a39 100644
> --- a/tools/testing/selftests/mm/split_huge_page_test.c
> +++ b/tools/testing/selftests/mm/split_huge_page_test.c
> @@ -106,7 +106,7 @@ void split_pmd_thp(void)
>  	for (i = 0; i < len; i++)
>  		one_page[i] = (char)i;
>  
> -	if (!check_huge_anon(one_page, 1, pmd_pagesize)) {
> +	if (!check_huge_anon(one_page, 4, pmd_pagesize)) {
>  		printf("No THP is allocated\n");
>  		exit(EXIT_FAILURE);
>  	}
> @@ -122,7 +122,7 @@ void split_pmd_thp(void)
>  		}
>  
>  
> -	if (check_huge_anon(one_page, 0, pmd_pagesize)) {
> +	if (!check_huge_anon(one_page, 0, pmd_pagesize)) {
>  		printf("Still AnonHugePages not split\n");
>  		exit(EXIT_FAILURE);
>  	}
> @@ -169,7 +169,7 @@ void split_pte_mapped_thp(void)
>  	for (i = 0; i < len; i++)
>  		one_page[i] = (char)i;
>  
> -	if (!check_huge_anon(one_page, 1, pmd_pagesize)) {
> +	if (!check_huge_anon(one_page, 4, pmd_pagesize)) {
>  		printf("No THP is allocated\n");
>  		exit(EXIT_FAILURE);
>  	}
> -- 
> 2.39.2
> 

Thanks Zi -- I had this in my TODO-log, but was slow to get it it -- apologies
for the clearly buggy code, and thanks for the cleanup. I've ran these tests to
confirm (as I should have previously), and it all looks good. Can have either my

Reviewed-by: Zach O'Keefe <zokeefe@...gle.com>
Tested-by: Zach O'Keefe <zokeefe@...gle.com>

I don't know which is more appropriate.

Best,
Zach