linux-kernel - Re: [PATCH v5 1/5] efi: arm64: Introduce ability to find mirrored memory ranges

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Date:   Wed, 15 Jun 2022 12:03:50 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     Wupeng Ma <mawupeng1@...wei.com>, Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kees Cook <keescook@...omium.org>, songmuchun@...edance.com,
        Randy Dunlap <rdunlap@...radead.org>,
        damien.lemoal@...nsource.wdc.com,
        Stephen Boyd <swboyd@...omium.org>,
        Wei Liu <wei.liu@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        David Hildenbrand <david@...hat.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Zhen Lei <thunder.leizhen@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>, gpiccoli@...lia.com,
        Huacai Chen <chenhuacai@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        vijayb@...ux.microsoft.com,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-efi <linux-efi@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v5 1/5] efi: arm64: Introduce ability to find mirrored
 memory ranges

On Wed, 15 Jun 2022 at 12:02, Catalin Marinas <catalin.marinas@....com> wrote:
>
> On Tue, Jun 14, 2022 at 05:21:52PM +0800, Wupeng Ma wrote:
> > From: Ma Wupeng <mawupeng1@...wei.com>
> >
> > Commit b05b9f5f9dcf ("x86, mirror: x86 enabling - find mirrored memory
> > ranges") introduce the efi_find_mirror() function on x86. In order to reuse
> > the API we make it public.
> >
> > Arm64 can support mirrored memory too, so function efi_find_mirror() is added to
> > efi_init() to this support for arm64.
> >
> > Since efi_init() is shared by ARM, arm64 and riscv, this patch will bring
> > mirror memory support for these architectures, but this support is only tested
> > in arm64.
> >
> > Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
> > ---
> >  arch/x86/include/asm/efi.h      |  4 ----
> >  arch/x86/platform/efi/efi.c     | 23 -----------------------
> >  drivers/firmware/efi/efi-init.c |  1 +
> >  drivers/firmware/efi/efi.c      | 23 +++++++++++++++++++++++
> >  include/linux/efi.h             |  3 +++
>
> The subject prefix says "efi: arm64: " but it looks like x86 diffstat
> here. You may want to get an ack from the x86 maintainers.
>

This just moves efi code around, and this is going through the EFI
tree, so that should be fine. I'll fix the subject in any case,
though.