linux-kernel - Re: [PATCH] arm64: mm: Fix NOMAP page initialization

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Date:   Wed, 14 Dec 2016 10:45:42 +0100
From:   Robert Richter <robert.richter@...ium.com>
To:     Yisheng Xie <xieyisheng1@...wei.com>
CC:     Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        David Daney <david.daney@...ium.com>,
        "Mark Rutland" <mark.rutland@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        "James Morse" <james.morse@....com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        Hanjun Guo <guohanjun@...wei.com>,
        Xishi Qiu <qiuxishi@...wei.com>
Subject: Re: [PATCH] arm64: mm: Fix NOMAP page initialization

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)
> 
> 
>