Re: [PATCH] mm/memtest: Add ARCH_USE_MEMTEST

[Max Filippov]

On Thu, Feb 4, 2021 at 8:10 PM Anshuman Khandual
<anshuman.khandual@xxxxxxx> 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@xxxxxxxxxxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> Cc: Paul Mackerras <paulus@xxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Chris Zankel <chris@xxxxxxxxxx>
> Cc: Max Filippov <jcmvbkbc@xxxxxxxxx>
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-mips@xxxxxxxxxxxxxxx
> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
> Cc: linux-xtensa@xxxxxxxxxxxxxxxx
> Cc: linux-mm@xxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Signed-off-by: Anshuman Khandual <anshuman.khandual@xxxxxxx>
> ---
> 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@xxxxxxxxx>

-- 
Thanks.
-- Max