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Date: Wed, 21 Oct 2020 12:54:28 +0300 From: Mike Rapoport <rppt@...nel.org> To: David Hildenbrand <david@...hat.com> Cc: Sudarshan Rajagopalan <sudaraja@...eaurora.org>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Anshuman Khandual <anshuman.khandual@....com>, Mark Rutland <mark.rutland@....com>, Steven Price <steven.price@....com>, Logan Gunthorpe <logang@...tatee.com>, Suren Baghdasaryan <surenb@...gle.com> Subject: Re: [PATCH 1/2] mm/memory_hotplug: allow marking of memory sections as hotpluggable On Sat, Oct 17, 2020 at 11:36:39AM +0200, David Hildenbrand wrote: > On 17.10.20 10:26, Mike Rapoport wrote: > > On Fri, Oct 16, 2020 at 07:02:23PM -0700, Sudarshan Rajagopalan wrote: > >> Certain architectures such as arm64 doesn't allow boot memory to be > >> offlined and removed. Distinguish certain memory sections as > >> "hotpluggable" which can be marked by module drivers stating to memory > >> hotplug layer that these sections can be offlined and then removed. > > > > I don't quite follow why marking sections as hotpluggable or not should > > be done by a device driver. Can you describe in more details your > > use-case and why there is a need to add a flag to the memory map? > > > > This seems to be related to > > https://lkml.kernel.org/r/de8388df2fbc5a6a33aab95831ba7db4@codeaurora.org Thanks for the pointer. > After reading how the driver is trying to abuse memory hot(un)plug > infrastructure, my tentative > > Nacked-by: David Hildenbrand <david@...hat.com> I also don't think we would want to let drivers play with the memory map. > -- > Thanks, > > David / dhildenb > -- Sincerely yours, Mike.
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