linux-kernel - Re: [PATCH V5 5/6] riscv: crash_core: Export kernel vm layout, phys_ram

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Date:   Wed, 10 Aug 2022 20:00:22 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     Conor.Dooley@...rochip.com, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, anup@...infault.org,
        heiko@...ech.de, guoren@...nel.org, mick@....forth.gr,
        alexandre.ghiti@...onical.com, bhe@...hat.com, vgoyal@...hat.com,
        dyoung@...hat.com, corbet@....net
Cc:     kexec@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        crash-utility@...hat.com, huanyi.xj@...baba-inc.com,
        heinrich.schuchardt@...onical.com, k-hagio-ab@....com,
        hschauhan@...ltrace.org, yixun.lan@...il.com
Subject: Re: [PATCH V5 5/6] riscv: crash_core: Export kernel vm layout,
 phys_ram_base


在 2022/8/10 上午5:20, Conor.Dooley@...rochip.com 写道:
> On 02/08/2022 13:18, Xianting Tian wrote:
>> riscv: crash_core: Export kernel vm layout, phys_ram_base
> Can you please just use RISC-V: for the whole series, my OCD
> hates the mix haha.

Sorry, I missed it,  you ever pointed out this poblem in the comments of 
V3, I will definitely fix the issue in V6.

>
>> These infos are needed by the kdump crash tool. Since these values change
>> from time to time, it is preferable to export them via vmcoreinfo than to
>> change the crash's code frequently.
> This commit description doesn't seem to match the patches at all.
> I don't see any exporting happening here at all - this is documenting
The real export code is in 2/6 patch, yes this is the document just 
describe the exporting contents
> the export. Maybe I am just misunderstanding, but this commit message
> just doesn't seem to match the change. Secondly, should the subject not
> be something like "docs: admin-guide: add riscv crash kernel yada yada"?
the commit log for the file 
'Documentation/admin-guide/kdump/vmcoreinfo.rst' is not unified in the 
commit history of the file. I agree with you 'docs: admin-guide: xxx' is 
better,  will fix it V6.
> Maybe the current subject lime that explains the lack of a review from
> the docs maintainer?
yes, it is possible :)
>
> Thanks,
> Conor.
For your comments for other patches, I will fix it in v6, thanks
>
>> Signed-off-by: Xianting Tian <xianting.tian@...ux.alibaba.com>
>> ---
>>   .../admin-guide/kdump/vmcoreinfo.rst          | 31 +++++++++++++++++++
>>   1 file changed, 31 insertions(+)
>>
>> diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst b/Documentation/admin-guide/kdump/vmcoreinfo.rst
>> index 8419019b6a88..6b76284a503c 100644
>> --- a/Documentation/admin-guide/kdump/vmcoreinfo.rst
>> +++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst
>> @@ -595,3 +595,34 @@ X2TLB
>>   -----
>>   
>>   Indicates whether the crashed kernel enabled SH extended mode.
>> +
>> +RISCV64
>> +=======
>> +
>> +VA_BITS
>> +-------
>> +
>> +The maximum number of bits for virtual addresses. Used to compute the
>> +virtual memory ranges.
>> +
>> +PAGE_OFFSET
>> +-----------
>> +
>> +Indicates the virtual kernel start address of direct-mapped RAM region.
>> +
>> +phys_ram_base
>> +-------------
>> +
>> +Indicates the start physical RAM address.
>> +
>> +MODULES_VADDR|MODULES_END|VMALLOC_START|VMALLOC_END|VMEMMAP_START|VMEMMAP_END
>> +-----------------------------------------------------------------------------
>> +KASAN_SHADOW_START|KASAN_SHADOW_END|KERNEL_LINK_ADDR|ADDRESS_SPACE_END
>> +----------------------------------------------------------------------
>> +
>> +Used to get the correct ranges:
>> +	MODULES_VADDR ~ MODULES_END : Kernel module space.
>> +	VMALLOC_START ~ VMALLOC_END : vmalloc() / ioremap() space.
>> +	VMEMMAP_START ~ VMEMMAP_END : vmemmap region, used for struct page array.
>> +	KASAN_SHADOW_START ~ KASAN_SHADOW_END : kasan shadow space.
>> +	KERNEL_LINK_ADDR ~ ADDRESS_SPACE_END : Kernel link and BPF space.