linux-kernel - Re: [PATCH 2/3] arm64: mm: reserve hugetlb CMA after numa

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Date:   Tue, 2 Jun 2020 20:22:19 -0700
From:   Roman Gushchin <guro@...com>
To:     Barry Song <song.bao.hua@...ilicon.com>
CC:     <hch@....de>, <m.szyprowski@...sung.com>, <robin.murphy@....com>,
        <catalin.marinas@....com>, <iommu@...ts.linux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <Jonathan.Cameron@...wei.com>, <john.garry@...wei.com>,
        <prime.zeng@...ilicon.com>
Subject: Re: [PATCH 2/3] arm64: mm: reserve hugetlb CMA after numa_init

On Wed, Jun 03, 2020 at 02:42:30PM +1200, Barry Song wrote:
> hugetlb_cma_reserve() is called at the wrong place. numa_init has not been
> done yet. so all reserved memory will be located at node0.
> 
> Cc: Roman Gushchin <guro@...com>
> Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>

Acked-by: Roman Gushchin <guro@...com>

Thanks!

> ---
>  arch/arm64/mm/init.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
> index e42727e3568e..8f0e70ebb49d 100644
> --- a/arch/arm64/mm/init.c
> +++ b/arch/arm64/mm/init.c
> @@ -458,11 +458,6 @@ void __init arm64_memblock_init(void)
>  	high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
>  
>  	dma_contiguous_reserve(arm64_dma32_phys_limit);
> -
> -#ifdef CONFIG_ARM64_4K_PAGES
> -	hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
> -#endif
> -
>  }
>  
>  void __init bootmem_init(void)
> @@ -478,6 +473,11 @@ void __init bootmem_init(void)
>  	min_low_pfn = min;
>  
>  	arm64_numa_init();
> +
> +#ifdef CONFIG_ARM64_4K_PAGES
> +	hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
> +#endif
> +
>  	/*
>  	 * Sparsemem tries to allocate bootmem in memory_present(), so must be
>  	 * done after the fixed reservations.
> -- 
> 2.23.0
> 
>