linux-kernel - Re: [PATCH v6] RISC-V: Implement sparsemem

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Message-ID: <80a6c33f-6914-ee5f-7456-e1bf3d8801e0@deltatee.com>
Date:   Thu, 29 Aug 2019 09:46:37 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     Rob Herring <robh@...nel.org>, Albert Ou <aou@...s.berkeley.edu>,
        Andrew Waterman <andrew@...ive.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        linux-kernel@...r.kernel.org,
        Michael Clark <michaeljclark@....com>,
        Zong Li <zong@...estech.com>, Olof Johansson <olof@...om.net>,
        Greentime Hu <greentime.hu@...ive.com>,
        linux-riscv@...ts.infradead.org,
        Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v6] RISC-V: Implement sparsemem



On 2019-08-29 12:21 a.m., Mike Rapoport wrote:
> On Wed, Aug 28, 2019 at 03:40:54PM -0600, Logan Gunthorpe wrote:
>> Implement sparsemem support for Risc-v which helps pave the
>> way for memory hotplug and eventually P2P support.
>>
>> Introduce Kconfig options for virtual and physical address bits which
>> are used to calculate the size of the vmemmap and set the
>> MAX_PHYSMEM_BITS.
>>
>> The vmemmap is located directly before the VMALLOC region and sized
>> such that we can allocate enough pages to populate all the virtual
>> address space in the system (similar to the way it's done in arm64).
>>
>> During initialization, call memblocks_present() and sparse_init(),
>> and provide a stub for vmemmap_populate() (all of which is similar to
>> arm64).
>>
>> [greentime.hu@...ive.com:
>>   fixed pfn_valid, FIXADDR_TOP and fixed a bug rebasing onto v5.3]
>> Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
>> Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
>> Reviewed-by: Palmer Dabbelt <palmer@...ive.com>
>> Reviewed-by: Christoph Hellwig <hch@....de>
>> Cc: Albert Ou <aou@...s.berkeley.edu>
>> Cc: Andrew Waterman <andrew@...ive.com>
>> Cc: Olof Johansson <olof@...om.net>
>> Cc: Michael Clark <michaeljclark@....com>
>> Cc: Rob Herring <robh@...nel.org>
>> Cc: Zong Li <zong@...estech.com>
> 
> Reviewed-by: Mike Rapoport <rppt@...ux.ibm.com>

Thanks!

Logan