linux-kernel - Re: [PATCH] mm/memtest: Add ARCH_USE

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Message-ID: <dc4c19d2-62e6-389a-bb03-33bf30381a3b@arm.com>
Date:   Mon, 8 Feb 2021 08:34:11 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Max Filippov <jcmvbkbc@...il.com>
Cc:     Linux Memory Management List <linux-mm@...ck.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Chris Zankel <chris@...kel.net>,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/memtest: Add ARCH_USE_MEMTEST



On 2/5/21 1:05 PM, Max Filippov wrote:
> On Thu, Feb 4, 2021 at 8:10 PM Anshuman Khandual
> <anshuman.khandual@....com> wrote:
>>
>> early_memtest() does not get called from all architectures. Hence enabling
>> CONFIG_MEMTEST and providing a valid memtest=[1..N] kernel command line
>> option might not trigger the memory pattern tests as would be expected in
>> normal circumstances. This situation is misleading.
>>
>> The change here prevents the above mentioned problem after introducing a
>> new config option ARCH_USE_MEMTEST that should be subscribed on platforms
>> that call early_memtest(), in order to enable the config CONFIG_MEMTEST.
>> Conversely CONFIG_MEMTEST cannot be enabled on platforms where it would
>> not be tested anyway.
>>
>> Cc: Russell King <linux@...linux.org.uk>
>> Cc: Catalin Marinas <catalin.marinas@....com>
>> Cc: Will Deacon <will@...nel.org>
>> Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
>> Cc: Michael Ellerman <mpe@...erman.id.au>
>> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
>> Cc: Paul Mackerras <paulus@...ba.org>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Ingo Molnar <mingo@...hat.com>
>> Cc: Chris Zankel <chris@...kel.net>
>> Cc: Max Filippov <jcmvbkbc@...il.com>
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Cc: linux-mips@...r.kernel.org
>> Cc: linuxppc-dev@...ts.ozlabs.org
>> Cc: linux-xtensa@...ux-xtensa.org
>> Cc: linux-mm@...ck.org
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>> This patch applies on v5.11-rc6 and has been tested on arm64 platform. But
>> it has been just build tested on all other platforms.
>>
>>  arch/arm/Kconfig     | 1 +
>>  arch/arm64/Kconfig   | 1 +
>>  arch/mips/Kconfig    | 1 +
>>  arch/powerpc/Kconfig | 1 +
>>  arch/x86/Kconfig     | 1 +
>>  arch/xtensa/Kconfig  | 1 +
>>  lib/Kconfig.debug    | 9 ++++++++-
>>  7 files changed, 14 insertions(+), 1 deletion(-)
> 
> Anshuman, entries in arch/*/Konfig files are sorted in alphabetical order,
> please keep them that way.

Sure, will fix up and resend.

> 
> Reviewed-by: Max Filippov <jcmvbkbc@...il.com>
>