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

Simon Horman
2023-04-07T12:04:03Z

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@huawei.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@kernel.org>

Perhaps 'Acked-by' :)