Re: [PATCH v4 0/2] Fix and enable pmem as RAM device on arm64
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- To: Jia He <justin.he@xxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>
- Subject: Re: [PATCH v4 0/2] Fix and enable pmem as RAM device on arm64
- From: David Hildenbrand <david@xxxxxxxxxx>
- Date: Fri, 10 Jul 2020 10:30:04 +0200
- Cc: x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Vishal Verma <vishal.l.verma@xxxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, Chuhong Yuan <hslester96@xxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, Logan Gunthorpe <logang@xxxxxxxxxxxx>, Masahiro Yamada <masahiroy@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, linux-nvdimm@xxxxxxxxxxxx, linux-mm@xxxxxxxxx, Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>, Kaly Xin <Kaly.Xin@xxxxxxx>
- In-reply-to: <20200710031619.18762-1-justin.he@arm.com>
- Organization: Red Hat GmbH
- References: <20200710031619.18762-1-justin.he@arm.com>
- User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.9.0
On 10.07.20 05:16, Jia He 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
So, this series no longer does what it promises? "Fix and enable pmem as
RAM device on arm64"
--
Thanks,
David / dhildenb
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