Re: [PATCH] mm/memtest: Add ARCH_USE_MEMTEST

Hi Anshuman,

On 2/5/21 4:10 AM, Anshuman Khandual 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.

Documentation already mentions which architectures support that:

memtest=        [KNL,X86,ARM,PPC] Enable memtest

yet I admit that not all reflected there

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.

Is that generic pattern? What about other cross arch parameters? Do they already
use similar subscription or they rely on documentation?

I'm not against the patch just want to check if things are consistent...

Cheers
Vladimir

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