linux-kernel - Re: [PATCH v2 0/1] arm/arm64: add support for folded p4d page tables

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Message-ID: <20200122185017.GA17321@willie-the-truck>
Date:   Wed, 22 Jan 2020 18:50:17 +0000
From:   Will Deacon <will@...nel.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        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>,
        kvmarm@...ts.cs.columbia.edu, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCH v2 0/1] arm/arm64: add support for folded p4d page tables

On Mon, Jan 13, 2020 at 01:13:22PM +0200, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> 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.

Unfortunately, that's going to be really hard to merge, as the two
architectures are maintained in different trees and the breadth of this
patch series is likely to lead to conflicts in both.

Will