linux-kernel - Re: [PATCH 0/5] selftests/mm: Implement support for arm64 on va

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Message-ID: <9a2fc29b-ab4c-b13a-0ac3-772a47039750@arm.com>
Date:   Fri, 24 Mar 2023 15:45:52 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Chaitanya S Prakash <chaitanyas.prakash@....com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 0/5] selftests/mm: Implement support for arm64 on va



On 3/24/23 03:19, Andrew Morton wrote:
> On Thu, 23 Mar 2023 16:22:38 +0530 Chaitanya S Prakash <chaitanyas.prakash@....com> wrote:
> 
>> The va_128TBswitch selftest is designed and implemented for PowerPC and
>> x86 architectures which support a 128TB switch, up to 256TB of virtual
>> address space and hugepage sizes of 16MB and 2MB respectively. Arm64
>> platforms on the other hand support a 256Tb switch, up to 4PB of virtual
>> address space and a default hugepage size of 512MB when 64k pagesize is
>> enabled.
>>
>> These architectural differences require introducing support for arm64
>> platforms, after which a more generic naming convention is suggested.
>> The in code comments are amended to provide a more platform independent
>> explanation of the working of the code and nr_hugepages are configured
>> as required. Finally, the file running the testcase is modified in order
>> to prevent skipping of hugetlb testcases of va_high_addr_switch.
>>
>> This series has been tested on 6.3.0-rc3 kernel, both on arm64 and x86
>> platforms.
> 
> Would it make sense to get this series into the ARM tree, so it sees
> more testing on ARM
Rather, it will be better for this series to go via the mm tree instead
(via linux-next first) for better coverage on all platforms, this being
a common test.