linux-kernel - Re: [PATCH 04/17] mm: pass the vmem_altmap to arch_add_memory and __add

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Message-ID: <CAPcyv4g_6izDX780Fqv=zx=aYrASivwYpQcNkRmZW3iSZfKQHQ@mail.gmail.com>
Date:   Fri, 15 Dec 2017 17:48:20 -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 04/17] mm: pass the vmem_altmap to arch_add_memory and __add_pages

On Fri, Dec 15, 2017 at 6:09 AM, Christoph Hellwig <hch@....de> wrote:
> We can just pass this on instead of having to do a radix tree lookup
> without proper locking 2 levels into the callchain.
>
> Signed-off-by: Christoph Hellwig <hch@....de>

Yeah, the lookup of vmem_altmap is too magical and surprising this is better.

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