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

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Message-ID: <20200109090719.GA14426@rapoport-lnx>
Date:   Thu, 9 Jan 2020 11:07:20 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Anshuman Khandual <anshuman.khandual@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        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 Thu, Jan 09, 2020 at 08:38:54AM +0530, Anshuman Khandual wrote:
> 
> 
> 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 ?

Well, I was waiting to see if there was some feedback except kbuild robot
response :)

I'm planning to send v2 soon, probably next week.
 
> - Anshuman

-- 
Sincerely yours,
Mike.