linux-kernel - Re: [PATCH v3 1/6] mm/memory_hotplug: introduce default dummy memory_add_physaddr_to

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Date:   Thu, 9 Jul 2020 11:10:13 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Jia He <justin.he@....com>,
        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>
Cc:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dan Williams <dan.j.williams@...el.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-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Kaly Xin <Kaly.Xin@....com>
Subject: Re: [PATCH v3 1/6] mm/memory_hotplug: introduce default dummy
 memory_add_physaddr_to_nid()

On 09.07.20 04:06, Jia He wrote:
> This is to introduce a general dummy helper. memory_add_physaddr_to_nid()
> is a fallback option to get the nid in case NUMA_NO_NID is detected.
> 
> After this patch, arm64/sh/s390 can simply use the general dummy version.
> PowerPC/x86/ia64 will still use their specific version.
> 
> Signed-off-by: Jia He <justin.he@....com>
> ---
>  mm/memory_hotplug.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index da374cd3d45b..b49ab743d914 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -350,6 +350,16 @@ int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages,
>  	return err;
>  }
>  
> +#ifdef CONFIG_NUMA
> +int __weak memory_add_physaddr_to_nid(u64 start)
> +{
> +	pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n",
> +			start);
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
> +#endif
> +
>  /* find the smallest valid pfn in the range [start_pfn, end_pfn) */
>  static unsigned long find_smallest_section_pfn(int nid, struct zone *zone,
>  				     unsigned long start_pfn,
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb