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(p200300cbc71761002da7427e49a50e07.dip0.t-ipconnect.de. [2003:cb:c717:6100:2da7:427e:49a5:e07]) by smtp.gmail.com with ESMTPSA id d6-20020adfe846000000b0030fd03e3d25sm8165077wrn.75.2023.07.13.07.41.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Jul 2023 07:41:48 -0700 (PDT) Message-ID: Date: Thu, 13 Jul 2023 16:41:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH v1 6/9] selftests/mm: va_high_addr_switch should skip unsupported arm64 configs Content-Language: en-US To: Ryan Roberts , Andrew Morton , Shuah Khan , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Mark Brown , John Hubbard , Florent Revest , "Liam R. Howlett" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org References: <20230713135440.3651409-1-ryan.roberts@arm.com> <20230713135440.3651409-7-ryan.roberts@arm.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230713135440.3651409-7-ryan.roberts@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org 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 > --- > 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 -- Cheers, David / dhildenb