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

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Message-ID: <Yna5AVli1IIUd2kg@arm.com>
Date:   Sat, 7 May 2022 19:22:57 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Baoquan He <bhe@...hat.com>
Cc:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>,
        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, 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 Sat, May 07, 2022 at 11:30:59AM +0800, Baoquan He wrote:
> 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.

Slightly more correct is "This one lets the user specify..."

I can fix them up when applying.

-- 
Catalin