linux-kernel - Re: [PATCH -next v3 1/2] riscv: kdump: Implement crashkernel=X,[high,low]

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Message-ID: <ZDAGqL6CZGrL499u@kernel.org>
Date:   Fri, 7 Apr 2023 14:03:52 +0200
From:   Simon Horman <horms@...nel.org>
To:     Guo Ren <guoren@...nel.org>
Cc:     Chen Jiahao <chenjiahao16@...wei.com>,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        kexec@...ts.infradead.org, linux-doc@...r.kernel.org,
        paul.walmsley@...ive.com, palmer@...belt.com,
        conor.dooley@...rochip.com, heiko@...ech.de, bjorn@...osinc.com,
        alex@...ti.fr, akpm@...ux-foundation.org, atishp@...osinc.com,
        bhe@...hat.com, thunder.leizhen@...wei.com
Subject: Re: [PATCH -next v3 1/2] riscv: kdump: Implement
 crashkernel=X,[high,low]

On Fri, Apr 07, 2023 at 05:06:24PM +0800, Guo Ren wrote:
> On Thu, Apr 6, 2023 at 10:06 PM Chen Jiahao <chenjiahao16@...wei.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=X,[high,low].
> >
> > One can reserve the crash kernel from high memory above DMA zone range
> > by explicitly passing "crashkernel=X,high"; or reserve a memory range
> > below 4G with "crashkernel=X,low".
> Asked-by: Guo Ren <guoren@...nel.org>

Perhaps 'Acked-by' :)