linux-kernel - Re: [PATCH v4 0/4] arm64: drop pfn_valid_within() and simplify pfn

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Message-ID: <b4b384c1-0d45-bb7f-3bd4-56cdb15ff2f8@huawei.com>
Date:   Wed, 12 May 2021 11:13:28 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Anshuman Khandual <anshuman.khandual@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "David Hildenbrand" <david@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Will Deacon <will@...nel.org>, <kvmarm@...ts.cs.columbia.edu>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v4 0/4] arm64: drop pfn_valid_within() and simplify
 pfn_valid()



On 2021/5/11 18:05, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> Hi,
> 
> These patches aim to remove CONFIG_HOLES_IN_ZONE and essentially hardwire
> pfn_valid_within() to 1.
> 
> The idea is to mark NOMAP pages as reserved in the memory map and restore
> the intended semantics of pfn_valid() to designate availability of struct
> page for a pfn.
> 
> With this the core mm will be able to cope with the fact that it cannot use
> NOMAP pages and the holes created by NOMAP ranges within MAX_ORDER blocks
> will be treated correctly even without the need for pfn_valid_within.
> 
> The patches are boot tested on qemu-system-aarch64.
> 
> I beleive it would be best to route these via mmotm tree.

Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>