linux-kernel - Re: [PATCH 0/1] arm/arm64: add support for folded p4d page tables

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Date:   Thu, 9 Jan 2020 08:38:54 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Mike Rapoport <rppt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>, kvmarm@...ts.cs.columbia.edu,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH 0/1] arm/arm64: add support for folded p4d page tables



On 12/30/2019 01:57 PM, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> Hi,

Hello Mike,

> 
> This is a part of clean up of the page table manipulation code that aims to
> remove asm-generic/5level-fixup.h and asm-generic/pgtable-nop4d-hack.h
> 
> There is a single patch for both arm and arm64 because doing the conversion
> separately would mean breaking the shared mmu bits in virt/kvm/arm.
> 
> The patch is build tested and boot tested on qemu-system-{arm,aarch64}.

There are lots of code changes here for a single patch but as you have
mentioned shared KVM bits would have prevented splitting arm and arm64
changes into separate patches. Just curious, are you planning to respin
this patch sooner after fixing the reported build problems caused by
missing p4d_offset_kimg() and p4d_sect() definitions ?

- Anshuman