linux-kernel - Re: [PATCH v1 6/9] selftests/mm: va_high_addr_switch should skip unsupported arm64 configs

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Date:   Thu, 13 Jul 2023 16:41:47 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Ryan Roberts <ryan.roberts@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        Mark Brown <broonie@...nel.org>,
        John Hubbard <jhubbard@...dia.com>,
        Florent Revest <revest@...omium.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v1 6/9] selftests/mm: va_high_addr_switch should skip
 unsupported arm64 configs

On 13.07.23 15:54, Ryan Roberts wrote:
> va_high_addr_switch has a mechanism to determine if the tests should be
> run or skipped (supported_arch()). This currently returns
> unconditionally true for arm64. However, va_high_addr_switch also
> requires a large virtual address space for the tests to run, otherwise
> they spuriously fail.
> 
> Since arm64 can only support VA > 48 bits when the page size is 64K,
> let's decide whether we should skip the test suite based on the page
> size. This reduces noise when running on 4K and 16K kernels.
> 
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
>   tools/testing/selftests/mm/va_high_addr_switch.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/mm/va_high_addr_switch.c b/tools/testing/selftests/mm/va_high_addr_switch.c
> index 7cfaf4a74c57..4b6f62c69a9d 100644
> --- a/tools/testing/selftests/mm/va_high_addr_switch.c
> +++ b/tools/testing/selftests/mm/va_high_addr_switch.c
> @@ -292,7 +292,8 @@ static int supported_arch(void)
>   #elif defined(__x86_64__)
>   	return 1;
>   #elif defined(__aarch64__)
> -	return 1;
> +	size_t page_size = getpagesize();
> +	return page_size == PAGE_SIZE;


return getpagesize() == PAGE_SIZE;

?


Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb