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

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Date:   Sat, 7 May 2022 11:30:59 +0800
From:   Baoquan He <bhe@...hat.com>
To:     "Leizhen (ThunderTown)" <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 05/07/22 at 09:41am, Leizhen (ThunderTown) wrote:
> 
> 
> On 2022/5/7 7:14, Baoquan He wrote:
> > 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.
> 
> Delete "This one let user to" or the entire sentence? I understand it to be the former.

Oh, I mean the 'to' is not needed. "This one let user specify ....". The
'to' is a grammer mistake.


> 
> > 
> > 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
> >>
> > 
> > .
> > 
> 
> -- 
> Regards,
>   Zhen Lei
>