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@xxxxxxxxxx>
---
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
