linux-kernel - Re: [PATCH 01/33] powerpc: use mm zones more sensibly

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Date:   Mon, 15 Oct 2018 11:47:13 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Christoph Hellwig <hch@....de>, Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev@...ts.ozlabs.org, iommu@...ts.linux-foundation.org,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/33] powerpc: use mm zones more sensibly

On Tue, 2018-10-09 at 15:24 +0200, Christoph Hellwig wrote:
>   * Find the least restrictive zone that is entirely below the
> @@ -324,11 +305,14 @@ void __init paging_init(void)
>         printk(KERN_DEBUG "Memory hole size: %ldMB\n",
>                (long int)((top_of_ram - total_ram) >> 20));
>  
> +#ifdef CONFIG_ZONE_DMA
> +       max_zone_pfns[ZONE_DMA] = min(max_low_pfn, 0x7fffffffUL >> PAGE_SHIFT);
> +#endif
> +       max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
>  #ifdef CONFIG_HIGHMEM
> -       limit_zone_pfn(ZONE_NORMAL, lowmem_end_addr >> PAGE_SHIFT);
> +       max_zone_pfns[ZONE_HIGHMEM] = max_pfn
                                               ^
Missing a  ";" here  --------------------------|

Sorry ... works with that fix on an old laptop with highmem.

>  #endif
> -       limit_zone_pfn(TOP_ZONE, top_of_ram >> PAGE_SHIFT);
> -       zone_limits_final = true;
> +
>         free_area_init_nodes(max_zone_pfns);
>