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

[David Hildenbrand]

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@xxxxxxx>
> ---
>   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@xxxxxxxxxx>

--
Cheers,

David / dhildenb