linux-kernel - Re: [PATCH v4 0/2] Fix and enable pmem as RAM device on arm64

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Date:   Fri, 10 Jul 2020 07:00:15 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jia He <justin.he@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        David Hildenbrand <david@...hat.com>, X86 ML <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Baoquan He <bhe@...hat.com>,
        Chuhong Yuan <hslester96@...il.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-ia64@...r.kernel.org, Linux-sh <linux-sh@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux MM <linux-mm@...ck.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Kaly Xin <Kaly.Xin@....com>
Subject: Re: [PATCH v4 0/2] Fix and enable pmem as RAM device on arm64

On Thu, Jul 9, 2020 at 8:17 PM Jia He <justin.he@....com> wrote:
>
> This fixies a few issues when I tried to enable pmem as RAM device on arm64.
>
> To use memory_add_physaddr_to_nid as a fallback nid, it would be better
> implement a general version (__weak) in mm/memory_hotplug. After that, arm64/
> sh/s390 can simply use the general version, and PowerPC/ia64/x86 will use
> arch specific version.
>
> Tested on ThunderX2 host/qemu "-M virt" guest with a nvdimm device. The
> memblocks from the dax pmem device can be either hot-added or hot-removed
> on arm64 guest. Also passed the compilation test on x86.
>
> Changes:
> v4: - remove "device-dax: use fallback nid when numa_node is invalid", wait
>       for Dan Williams' phys_addr_to_target_node() patch

FWIW, I put these patches through a 0-day run overnight and will be
posting them today.