# Re: \[PATCH\] mm/memtest: Add ARCH\_USE\_MEMTEST

- From: Max Filippov \<jcmvbkbc@gmail.com\>
- Date: 2021-02-05 07:36:26 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2021/02/6259605
- Thread: https://ratatoskr.run/linux-mm/2021/02/6259509/t.md

```text
On Thu, Feb 4, 2021 at 8:10 PM Anshuman Khandual
[ref] 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@armlinux.org.uk>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <redacted>
> Cc: Thomas Gleixner <redacted>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: Chris Zankel <chris@zankel.net>
> Cc: Max Filippov <jcmvbkbc@gmail.com>
> Cc: <redacted>
> Cc: <redacted>
> Cc: <redacted>
> Cc: <redacted>
> Cc: <redacted>
> Cc: <redacted>
> Signed-off-by: Anshuman Khandual <redacted>
> ---
> 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.

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

-- 
Thanks.
-- Max

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```