linux-kernel - Re: [PATCH 08/17] mm: pass the vmem_altmap to memmap_init

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Message-ID: <CAPcyv4i6MvJ5X8potRT2nwFDXAGHNGEooxw_vV_h2+sHoRnUSg@mail.gmail.com>
Date:   Fri, 15 Dec 2017 18:15:43 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jérôme Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        X86 ML <x86@...nel.org>, Linux MM <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/17] mm: pass the vmem_altmap to memmap_init_zone

On Fri, Dec 15, 2017 at 6:09 AM, Christoph Hellwig <hch@....de> wrote:
> Pass the vmem_altmap two levels down instead of needing a lookup.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

Given the fact that HMM and now P2P are attracted to
devm_memremap_pages() I think this churn is worth it. vmem_altmap is
worth being considered a first class citizen of memory hotplug and not
a hidden hack.

Reviewed-by: Dan Williams <dan.j.williams@...el.com>