linux-kernel - Re: [HMM 01/16] mm/memory/hotplug: add memory type parameter to arch_add/remove

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Date:   Thu, 6 Apr 2017 15:15:09 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Jérôme Glisse <jglisse@...hat.com>,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     John Hubbard <jhubbard@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        David Nellans <dnellans@...dia.com>,
        Russell King <linux@...linux.org.uk>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [HMM 01/16] mm/memory/hotplug: add memory type parameter to
 arch_add/remove_memory

> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index 5f84433..0933261 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -126,14 +126,31 @@ int __weak remove_section_mapping(unsigned long start, unsigned long end)
>  	return -ENODEV;
>  }
>  
> -int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
> +int arch_add_memory(int nid, u64 start, u64 size, enum memory_type type)
>  {
>  	struct pglist_data *pgdata;
> -	struct zone *zone;
>  	unsigned long start_pfn = start >> PAGE_SHIFT;
>  	unsigned long nr_pages = size >> PAGE_SHIFT;
> +	bool for_device = false;
> +	struct zone *zone;
>  	int rc;
>  
> +	/*
> +	 * Each memory_type needs special handling, so error out on an
> +	 * unsupported type. In particular, MEMORY_DEVICE_UNADDRESSABLE
> +	 * is not supported on this architecture.

The concept of MEMORY_DEVICE_UNADDRESSABLE has not been
introduced yet in this patch if I read correctly.