linux-kernel - Re: [PATCH v24 6/6] docs: kdump: Update the crashkernel description for arm64

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Message-ID: <20220506231451.GB122876@MiWiFi-R3L-srv>
Date:   Sat, 7 May 2022 07:14:51 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Zhen Lei <thunder.leizhen@...wei.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        linux-kernel@...r.kernel.org, Dave Young <dyoung@...hat.com>,
        Vivek Goyal <vgoyal@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        kexec@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        devicetree@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Feng Zhou <zhoufeng.zf@...edance.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Chen Zhou <dingguo.cz@...group.com>,
        John Donnelly <John.p.donnelly@...cle.com>,
        Dave Kleikamp <dave.kleikamp@...cle.com>
Subject: Re: [PATCH v24 6/6] docs: kdump: Update the crashkernel description
 for arm64

On 05/06/22 at 07:44pm, Zhen Lei wrote:
> Now arm64 has added support for "crashkernel=X,high" and
> "crashkernel=Y,low". Unlike x86, crash low memory is not allocated if
> "crashkernel=Y,low" is not specified.
> 
> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 3f1cc5e317ed4a5..aa44c61114aa4b8 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -808,7 +808,7 @@
>  			Documentation/admin-guide/kdump/kdump.rst for an example.
>  
>  	crashkernel=size[KMG],high
> -			[KNL, X86-64] range could be above 4G. Allow kernel
> +			[KNL, X86-64, ARM64] range could be above 4G. Allow kernel
>  			to allocate physical memory region from top, so could
>  			be above 4G if system have more than 4G ram installed.
>  			Otherwise memory region will be allocated below 4G, if
> @@ -821,7 +821,7 @@
>  			that require some amount of low memory, e.g. swiotlb
>  			requires at least 64M+32K low memory, also enough extra
>  			low memory is needed to make sure DMA buffers for 32-bit
> -			devices won't run out. Kernel would try to allocate at
> +			devices won't run out. Kernel would try to allocate
>  			at least 256M below 4G automatically.
>  			This one let user to specify own low range under 4G
>  			for second kernel instead.
> @@ -829,6 +829,11 @@
>  			It will be ignored when crashkernel=X,high is not used
>  			or memory reserved is below 4G.
>  
> +			[KNL, ARM64] range in low memory.
> +			This one let user to specify a low range in DMA zone for
                                          ^ not needed,
                        Maybe Catalin can fix it when merging.

Other than this, LGTM,

Acked-by: Baoquan He <bhe@...hat.com>

> +			crash dump kernel.
> +			It will be ignored when crashkernel=X,high is not used.
> +
>  	cryptomgr.notests
>  			[KNL] Disable crypto self-tests
>  
> -- 
> 2.25.1
>