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SubjectRe: [PATCH 4/4] kdump: update Documentation about crashkernel on arm64
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On 05/07/2019 09:20 AM, Chen Zhou wrote:
> Now we support crashkernel=X,[high,low] on arm64, update the
> Documentation.
>
> Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 268b10a..03a08aa 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -705,7 +705,7 @@
> memory region [offset, offset + size] for that kernel
> image. If '@offset' is omitted, then a suitable offset
> is selected automatically.
> - [KNL, x86_64] select a region under 4G first, and
> + [KNL, x86_64, arm64] select a region under 4G first, and
> fall back to reserve region above 4G when '@offset'
> hasn't been specified.
> See Documentation/kdump/kdump.txt for further details.
> @@ -718,14 +718,14 @@
> Documentation/kdump/kdump.txt 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
> available.
> It will be ignored if crashkernel=X is specified.
> crashkernel=size[KMG],low
> - [KNL, x86_64] range under 4G. When crashkernel=X,high
> + [KNL, x86_64, arm64] range under 4G. When crashkernel=X,high
> is passed, kernel could allocate physical memory region
> above 4G, that cause second kernel crash on system
> that require some amount of low memory, e.g. swiotlb
>

IMO, it is a good time to update 'Documentation/kdump/kdump.txt' with
this patchset itself for both x86_64 and arm64, where we still specify
only the old format for 'crashkernel' boot-argument:

Section: Boot into System Kernel
=======================

On arm64, use "crashkernel=Y[@X]". Note that the start address of
the kernel, X if explicitly specified, must be aligned to 2MiB (0x200000).
...

We can update this to add the new crashkernel=size[KMG],low or
crashkernel=size[KMG],high format as well.

Thanks,
Bhupesh

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