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Date:   Fri, 25 Jan 2019 17:45:02 +0000
From:   Catalin Marinas <catalin.marinas@arm.com>
To:     Mike Rapoport <rppt@linux.ibm.com>
Cc:     linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        Christoph Hellwig <hch@lst.de>,
        "David S. Miller" <davem@davemloft.net>,
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Subject: Re: [PATCH v2 06/21] memblock: memblock_phys_alloc_try_nid(): don't
 panic
Message-ID: <20190125174502.GL25901@arrakis.emea.arm.com>
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On Mon, Jan 21, 2019 at 10:03:53AM +0200, Mike Rapoport wrote:
> diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
> index ae34e3a..2c61ea4 100644
> --- a/arch/arm64/mm/numa.c
> +++ b/arch/arm64/mm/numa.c
> @@ -237,6 +237,10 @@ static void __init setup_node_data(int nid, u64 start_pfn, u64 end_pfn)
>  		pr_info("Initmem setup node %d [<memory-less node>]\n", nid);
>  
>  	nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
> +	if (!nd_pa)
> +		panic("Cannot allocate %zu bytes for node %d data\n",
> +		      nd_size, nid);
> +
>  	nd = __va(nd_pa);
>  
>  	/* report and initialize */

Does it mean that memblock_phys_alloc_try_nid() never returns valid
physical memory starting at 0?

-- 
Catalin