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

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Date:   Thu, 15 Dec 2016 16:48:45 +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 15.12.16 11:01:04, Yisheng Xie wrote:
> > I sent a V2 patch that uses pfn_present(). This only initilizes
> > sections with memory.
> hmm， maybe I do not quite catch what your mean, but I do not think
> pfn_present is right for this case.
> 
> IMO, The valid_section() means the section with mem_map, not section with memory.

Right, the section may be uninitialized with the present flag only.
valid_section() is better, this is also the pfn_valid() default
implementation.

Will rework. Thanks.

-Robert