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Date: Tue, 14 May 2024 22:40:27 +0200
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Subject: Re: [PATCH v2 6/8] riscv: Enable memory hotplugging for RISC-V
To: =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@kernel.org>,
 Alexandre Ghiti <alexghiti@rivosinc.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>, Palmer Dabbelt <palmer@dabbelt.com>,
 Paul Walmsley <paul.walmsley@sifive.com>, linux-riscv@lists.infradead.org,
 =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@rivosinc.com>,
 Andrew Bresticker <abrestic@rivosinc.com>,
 Chethan Seshadri <Chethan.Seshadri@catalinasystems.io>,
 Lorenzo Stoakes <lstoakes@gmail.com>, Oscar Salvador <osalvador@suse.de>,
 Santosh Mamila <santosh.mamila@catalinasystems.io>,
 Sivakumar Munnangi <siva.munnangi@catalinasystems.io>,
 Sunil V L <sunilvl@ventanamicro.com>, linux-kernel@vger.kernel.org,
 linux-mm@kvack.org, virtualization@lists.linux-foundation.org
References: <20240514140446.538622-1-bjorn@kernel.org>
 <20240514140446.538622-7-bjorn@kernel.org>
 <CAHVXubi6Hv_FCTi=a5FFoxqiUBucrX_NhVGBAWE6qXRXdzOYsA@mail.gmail.com>
 <87r0e4l0m6.fsf@all.your.base.are.belong.to.us>
From: David Hildenbrand <david@redhat.com>
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In-Reply-To: <87r0e4l0m6.fsf@all.your.base.are.belong.to.us>
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On 14.05.24 20:17, Björn Töpel wrote:
> Alexandre Ghiti <alexghiti@rivosinc.com> writes:
> 
>> On Tue, May 14, 2024 at 4:05 PM Björn Töpel <bjorn@kernel.org> wrote:
>>>
>>> From: Björn Töpel <bjorn@rivosinc.com>
>>>
>>> Enable ARCH_ENABLE_MEMORY_HOTPLUG and ARCH_ENABLE_MEMORY_HOTREMOVE for
>>> RISC-V.
>>>
>>> Signed-off-by: Björn Töpel <bjorn@rivosinc.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.

There was a discussion at LSF/MM today to maybe require 
SPARSEMEM_VMEMMAP for hotplug. Would that work here as well?

-- 
Cheers,

David / dhildenb