linux-kernel - Re: [PATCH v17 09/10] of: fdt: Add memory for devices by DT property "linux,usable-memory-range"

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Message-ID: <YbODo3WbV27NyL7h@robh.at.kernel.org>
Date:   Fri, 10 Dec 2021 10:43:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-doc@...r.kernel.org,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Will Deacon <will@...nel.org>,
        Chen Zhou <dingguo.cz@...group.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Rob Herring <robh+dt@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>,
        Frank Rowand <frowand.list@...il.com>,
        kexec@...ts.infradead.org, Baoquan He <bhe@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        linux-arm-kernel@...ts.infradead.org,
        Dave Young <dyoung@...hat.com>, devicetree@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH v17 09/10] of: fdt: Add memory for devices by DT property
 "linux,usable-memory-range"

On Fri, 10 Dec 2021 14:55:32 +0800, Zhen Lei wrote:
> From: Chen Zhou <chenzhou10@...wei.com>
> 
> When reserving crashkernel in high memory, some low memory is reserved
> for crash dump kernel devices and never mapped by the first kernel.
> This memory range is advertised to crash dump kernel via DT property
> under /chosen,
>         linux,usable-memory-range = <BASE1 SIZE1 [BASE2 SIZE2]>
> 
> We reused the DT property linux,usable-memory-range and made the low
> memory region as the second range "BASE2 SIZE2", which keeps compatibility
> with existing user-space and older kdump kernels.
> 
> Crash dump kernel reads this property at boot time and call memblock_add()
> to add the low memory region after memblock_cap_memory_range() has been
> called.
> 
> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> Tested-by: Dave Kleikamp <dave.kleikamp@...cle.com>
> ---
>  drivers/of/fdt.c | 33 +++++++++++++++++++++++----------
>  1 file changed, 23 insertions(+), 10 deletions(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>