linux-kernel - Re: [PATCH] selftests/mm: va_high_addr_switch: Do not skip test and give warning message post FEAT

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Message-ID: <ab1939d8-1913-4b26-a2a2-3b49efb62e97@arm.com>
Date: Tue, 21 May 2024 18:22:20 +0530
From: Dev Jain <dev.jain@....com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: shuah@...nel.org, linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
 linux-kernel@...r.kernel.org, Anshuman.Khandual@....com,
 kirill.shutemov@...ux.intel.com, AneeshKumar.KizhakeVeetil@....com
Subject: Re: [PATCH] selftests/mm: va_high_addr_switch: Do not skip test and
 give warning message post FEAT_LPA2


On 5/20/24 05:18, Andrew Morton wrote:
> On Thu, 16 May 2024 09:26:33 +0530 Dev Jain <dev.jain@....com> wrote:
>
>> Post FEAT_LPA2, Aarch64 extends the 4KB and 16KB translation granule to
>> large virtual addresses. Currently, the test is being skipped for said
>> granule sizes, because the page sizes have been statically defined; to
>> work around that would mean breaking the nice array of structs used for
>> adding testcases.
> Which array is that?  testcases[]?  If so, we could keep if fairly nice
> by doing the array population at runtime.  Something like:
>
> static struct testcase *testcases;
>
> static void init_thing()
> {
> 	struct testcase t[] = {
> 		...
> 	};
>
> 	testcases = malloc(sizeof(t));
> 	memcpy(testcases, t, sizeof(t));
> }


Great idea! This should work. I shall implement it.