From mboxrd@z Thu Jan  1 00:00:00 1970
From: robert.richter@cavium.com (Robert Richter)
Date: Wed, 14 Dec 2016 10:45:42 +0100
Subject: [PATCH] arm64: mm: Fix NOMAP page initialization
In-Reply-To: <9168b603-04aa-4302-3197-00f17fb336bd@huawei.com>
References: <1481307042-29773-1-git-send-email-rrichter@cavium.com>
 <83d6e6d0-cfb3-ec8b-241b-ec6a50dc2aa9@huawei.com>
 <9168b603-04aa-4302-3197-00f17fb336bd@huawei.com>
Message-ID: <20161214094542.GE5588@rric.localdomain>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On 12.12.16 17:53:02, Yisheng Xie wrote:
> It seems that memblock_is_memory() is also too strict for early_pfn_valid,
> so what about this patch, which use common pfn_valid as early_pfn_valid
> when CONFIG_HAVE_ARCH_PFN_VALID=y:
> ------------
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 0f088f3..9d596f3 100644
> --- a/include/linux/mmzone.h
> +++ b/include/linux/mmzone.h
> @@ -1200,7 +1200,17 @@ static inline int pfn_present(unsigned long pfn)
>  #define pfn_to_nid(pfn)                (0)
>  #endif
> 
> +#ifdef CONFIG_HAVE_ARCH_PFN_VALID
> +static inline int early_pfn_valid(unsigned long pfn)
> +{
> +       if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
> +               return 0;
> +       return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
> +}

I sent a V2 patch that uses pfn_present(). This only initilizes
sections with memory.

-Robert

> +#define early_pfn_valid early_pfn_valid
> +#else
>  #define early_pfn_valid(pfn)   pfn_valid(pfn)
> +#endif
>  void sparse_init(void);
>  #else
>  #define sparse_init()  do {} while (0)
> 
> 
>