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From:   Guo Ren <guoren@kernel.org>
Date:   Tue, 11 Apr 2023 09:38:18 +0800
Message-ID: <CAJF2gTQ-aRfpK_Ct7pbTcgBEU9qkTAr9VG8B66G0NDBmchSYtA@mail.gmail.com>
Subject: Re: [PATCH -next v3 1/2] riscv: kdump: Implement crashkernel=X,[high,low]
To:     Simon Horman <horms@kernel.org>
Cc:     Chen Jiahao <chenjiahao16@huawei.com>,
        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
        kexec@lists.infradead.org, linux-doc@vger.kernel.org,
        paul.walmsley@sifive.com, palmer@dabbelt.com,
        conor.dooley@microchip.com, heiko@sntech.de, bjorn@rivosinc.com,
        alex@ghiti.fr, akpm@linux-foundation.org, atishp@rivosinc.com,
        bhe@redhat.com, thunder.leizhen@huawei.com
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On Fri, Apr 7, 2023 at 8:03=E2=80=AFPM Simon Horman <horms@kernel.org> wrot=
e:
>
> On Fri, Apr 07, 2023 at 05:06:24PM +0800, Guo Ren wrote:
> > On Thu, Apr 6, 2023 at 10:06=E2=80=AFPM Chen Jiahao <chenjiahao16@huawe=
i.com> wrote:
> > >
> > > On riscv, the current crash kernel allocation logic is trying to
> > > allocate within 32bit addressible memory region by default, if
> > > failed, try to allocate without 4G restriction.
> > >
> > > In need of saving DMA zone memory while allocating a relatively large
> > > crash kernel region, allocating the reserved memory top down in
> > > high memory, without overlapping the DMA zone, is a mature solution.
> > > Here introduce the parameter option crashkernel=3DX,[high,low].
> > >
> > > One can reserve the crash kernel from high memory above DMA zone rang=
e
> > > by explicitly passing "crashkernel=3DX,high"; or reserve a memory ran=
ge
> > > below 4G with "crashkernel=3DX,low".
> > Asked-by: Guo Ren <guoren@kernel.org>
>
> Perhaps 'Acked-by' :)
Sorry, my typo.

Acked-by: Guo Ren <guoren@kernel.org>


--=20
Best Regards
 Guo Ren