Re: [PATCH 1/2] mm: remove CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE

David Hildenbrand (Arm)
2026-03-19T18:09:16Z

On 3/19/26 16:24, Gregory Price wrote:
> On Thu, Mar 19, 2026 at 09:19:40AM +0100, David Hildenbrand (Arm) wrote:
>> All architectures that select CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE also
>> select CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG. So we can just remove
>> CONFIG_ARCH_ENABLE_MEMORY_HOTREMOVE.
>>
>> For CONFIG_MIGRATION, make it depend on CONFIG_MEMORY_HOTREMOVE instead,
>> and make CONFIG_MEMORY_HOTREMOVE select CONFIG_MIGRATION (just like
>> CONFIG_CMA and CONFIG_COMPACTION already do).
>>
>> We'll clean up CONFIG_MIGRATION next.
>>
>> Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
>
> HOTREMOVE has long been a thorn in my side, I appreciate you cleaning
> this up.

On a long cardrive today I was wondering: do we still need a separate
MEMORY_HOTREMOVE

Now we'll have

config MEMORY_HOTREMOVE
bool "Allow for memory hot remove"
select HAVE_BOOTMEM_INFO_NODE if (X86_64 || PPC64)
depends on MEMORY_HOTPLUG
select MIGRATION

I'll try to get rid of that HAVE_BOOTMEM_INFO_NODE shite next.

Then it's really just MIGRATION and some sprinkled
CONFIG_MEMORY_HOTREMOVE. Not a lot of code.

--
Cheers,

David