linux-kernel - Re: [PATCH v2 6/8] riscv: Enable memory hotplugging for RISC-V

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Date: Tue, 14 May 2024 20:17:05 +0200
From: Björn Töpel <bjorn@...nel.org>
To: Alexandre Ghiti <alexghiti@...osinc.com>
Cc: Albert Ou <aou@...s.berkeley.edu>, David Hildenbrand <david@...hat.com>,
 Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley
 <paul.walmsley@...ive.com>, linux-riscv@...ts.infradead.org,
 Björn Töpel
 <bjorn@...osinc.com>, Andrew Bresticker <abrestic@...osinc.com>, Chethan
 Seshadri <Chethan.Seshadri@...alinasystems.io>, Lorenzo Stoakes
 <lstoakes@...il.com>, Oscar Salvador <osalvador@...e.de>, Santosh Mamila
 <santosh.mamila@...alinasystems.io>, Sivakumar Munnangi
 <siva.munnangi@...alinasystems.io>, Sunil V L <sunilvl@...tanamicro.com>,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 6/8] riscv: Enable memory hotplugging for RISC-V

Alexandre Ghiti <alexghiti@...osinc.com> writes:

> On Tue, May 14, 2024 at 4:05 PM Björn Töpel <bjorn@...nel.org> wrote:
>>
>> From: Björn Töpel <bjorn@...osinc.com>
>>
>> Enable ARCH_ENABLE_MEMORY_HOTPLUG and ARCH_ENABLE_MEMORY_HOTREMOVE for
>> RISC-V.
>>
>> Signed-off-by: Björn Töpel <bjorn@...osinc.com>
>> ---
>>  arch/riscv/Kconfig | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
>> index 6bec1bce6586..b9398b64bb69 100644
>> --- a/arch/riscv/Kconfig
>> +++ b/arch/riscv/Kconfig
>> @@ -16,6 +16,8 @@ config RISCV
>>         select ACPI_REDUCED_HARDWARE_ONLY if ACPI
>>         select ARCH_DMA_DEFAULT_COHERENT
>>         select ARCH_ENABLE_HUGEPAGE_MIGRATION if HUGETLB_PAGE && MIGRATION
>> +       select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM && 64BIT && MMU
>
> I think this should be SPARSEMEM_VMEMMAP here.

Hmm, care to elaborate? I thought that was optional.