lkml.org 
[lkml]   [2020]   [Jun]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Re: [RESEND PATCH v5 5/5] Documentation/vmcoreinfo: Add documentation for 'TCR_EL1.T1SZ'
From
Date
Hi Bhupesh,

Would be great to get this patch series upstreamed?

On 2019-12-25 10:49 a.m., Bhupesh Sharma wrote:
> Hi James,
>
> On 12/12/2019 04:02 PM, James Morse wrote:
>> Hi Bhupesh,
>
> I am sorry this review mail skipped my attention due to holidays and
> focus on other urgent issues.
>
>> On 29/11/2019 19:59, Bhupesh Sharma wrote:
>>> Add documentation for TCR_EL1.T1SZ variable being added to
>>> vmcoreinfo.
>>>
>>> It indicates the size offset of the memory region addressed by
>>> TTBR1_EL1
>>
>>> and hence can be used for determining the vabits_actual value.
>>
>> used for determining random-internal-kernel-variable, that might not
>> exist tomorrow.
>>
>> Could you describe how this is useful/necessary if a debugger wants
>> to walk the page
>> tables from the core file? I think this is a better argument.
>>
>> Wouldn't the documentation be better as part of the patch that adds
>> the export?
>> (... unless these have to go via different trees? ..)
>
> Ok, will fix the same in v6 version.
>
>>> diff --git a/Documentation/admin-guide/kdump/vmcoreinfo.rst
>>> b/Documentation/admin-guide/kdump/vmcoreinfo.rst
>>> index 447b64314f56..f9349f9d3345 100644
>>> --- a/Documentation/admin-guide/kdump/vmcoreinfo.rst
>>> +++ b/Documentation/admin-guide/kdump/vmcoreinfo.rst
>>> @@ -398,6 +398,12 @@ KERNELOFFSET
>>>   The kernel randomization offset. Used to compute the page offset. If
>>>   KASLR is disabled, this value is zero.
>>>   +TCR_EL1.T1SZ
>>> +------------
>>> +
>>> +Indicates the size offset of the memory region addressed by TTBR1_EL1
>>
>>> +and hence can be used for determining the vabits_actual value.
>>
>> 'vabits_actual' may not exist when the next person comes to read this
>> documentation (its
>> going to rot really quickly).
>>
>> I think the first half of this text is enough to say what this is
>> for. You should include
>> words to the effect that its the hardware value that goes with
>> swapper_pg_dir. You may
>> want to point readers to the arm-arm for more details on what the
>> value means.
>
> Ok, got it. Fixed this in v6, which should be on its way shortly.
I can't seem to find v6?
>
> Thanks,
> Bhupesh
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
>

\
 
 \ /
  Last update: 2020-06-03 20:49    [W:0.057 / U:19.300 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site