Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
To:     Paul Walmsley <paul.walmsley@sifive.com>,
        Greentime Hu <green.hu@gmail.com>
Cc:     Rob Herring <robh@kernel.org>, Albert Ou <aou@eecs.berkeley.edu>,
        Andrew Waterman <andrew@sifive.com>,
        Palmer Dabbelt <palmer@sifive.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Stephen Bates <sbates@raithlin.com>, linux-mm@vger.kernel.org,
        Olof Johansson <olof@lixom.net>, greentime.hu@sifive.com,
        linux-riscv@lists.infradead.org,
        Michael Clark <michaeljclark@mac.com>,
        Christoph Hellwig <hch@lst.de>
References: <20190109203911.7887-1-logang@deltatee.com>
 <c4298fdd-6fd6-fa7f-73f7-5ff016788e49@deltatee.com>
 <CAEbi=3cn4+7zk2DU1iRa45CDwTsJYfkAV8jXHf-S7Jz63eYy-A@mail.gmail.com>
 <CAEbi=3eZcgWevpX9VO9ohgxVDFVprk_t52Xbs3-TdtZ+js3NVA@mail.gmail.com>
 <0926a261-520e-4c40-f926-ddd40bb8ce44@deltatee.com>
 <CAEbi=3ebNM-t_vA4OA7KCvQUF08o6VmL1j=kMojVnYsYsN_fBw@mail.gmail.com>
 <e2603558-7b2c-2e5f-e28c-f01782dc4e66@deltatee.com>
 <CAEbi=3d7_xefYaVXEnMJW49Bzdbbmc2+UOwXWrCiBo7YkTAihg@mail.gmail.com>
 <96156909-1453-d487-ff66-a041d67c74d6@deltatee.com>
 <CAEbi=3dC86dhGdwdarS_x+6-5=WPydUBKjo613qRZxKLDAqU_g@mail.gmail.com>
 <5506c875-9387-acc9-a7fe-5b7c10036c40@deltatee.com>
 <alpine.DEB.2.21.9999.1908130921170.30024@viisi.sifive.com>
 <e1f78a33-18bb-bd6e-eede-e5e86758a4d0@deltatee.com>
 <CAEbi=3f+JDywuHYspfYKuC8z2wm8inRenBz+3DYbKK3ixFjU_g@mail.gmail.com>
 <0d81412d-73fc-fa56-6f84-dedda72b9cc6@deltatee.com>
 <alpine.DEB.2.21.9999.1908141035020.18249@viisi.sifive.com>
From:   Logan Gunthorpe <logang@deltatee.com>
Message-ID: <26594413-227b-2cc8-0f61-232a6a3907d0@deltatee.com>
Date:   Wed, 14 Aug 2019 11:46:23 -0600
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.8.0
MIME-Version: 1.0
In-Reply-To: <alpine.DEB.2.21.9999.1908141035020.18249@viisi.sifive.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Subject: Re: [PATCH v4 2/2] RISC-V: Implement sparsemem
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


On 2019-08-14 11:40 a.m., Paul Walmsley wrote:
> On Wed, 14 Aug 2019, Logan Gunthorpe wrote:
> 
>> On 2019-08-14 7:35 a.m., Greentime Hu wrote:
>>
>>> Maybe this commit explains why it used HAVE_ARCH_PFN_VALID instead of SPARSEMEM.
>>> https://github.com/torvalds/linux/commit/7b7bf499f79de3f6c85a340c8453a78789523f85
>>>
>>> BTW, I found another issue here.
>>> #define FIXADDR_TOP            (VMALLOC_START)
>>> #define FIXADDR_START           (FIXADDR_TOP - FIXADDR_SIZE)
>>> #define VMEMMAP_END    (VMALLOC_START - 1)
>>> #define VMEMMAP_START  (VMALLOC_START - VMEMMAP_SIZE)
>>> These 2 regions are overlapped.
>>>
>>> How about this fix? Not sure if it is good for everyone.
>>
>> Yes, this looks good to me. I can fold these changes into my patch and
>> send a v5 to the list.
> 
> The change to FIXADDR_TOP should be separated out into its own patch - it 
> probably needs to go up as a fix.

I don't think so... VMEMMAP_START doesn't exist until the sparsemem
patch so it can't be changed until after the sparsemem patch and no
sense adding a bug in the sparsemem patch...

Logan