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

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Date: Tue, 14 May 2024 20:41:56 +0200
From: Alexandre Ghiti <alexghiti@...osinc.com>
To: Björn Töpel <bjorn@...nel.org>
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

On Tue, May 14, 2024 at 8:17 PM Björn Töpel <bjorn@...nelorg> wrote:
>
> 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.

My bad, I thought VMEMMAP was required in your patchset. Sorry for the noise!