Describe the new crashkernel ",cma" suffix in Documentation/
---
Documentation/admin-guide/kdump/kdump.rst | 10 ++++++++++
Documentation/admin-guide/kernel-parameters.txt | 7 +++++++
2 files changed, 17 insertions(+)
diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst
index 5762e7477a0c..4ec08e5843dc 100644
--- a/Documentation/admin-guide/kdump/kdump.rst
+++ b/Documentation/admin-guide/kdump/kdump.rst
@@ -317,6 +317,16 @@ crashkernel syntax
crashkernel=0,low
+4) crashkernel=size,cma
+
+ Reserves additional memory from CMA. A standard crashkernel reservation, as
+ described above, is still needed, but can be just small enough to hold the
+ kernel and initrd. All the memory the crash kernel needs for its runtime and
+ for running the kdump userspace processes can be provided by this CMA
+ reservation, re-using memory available to the production system's userspace.
+ Because of this re-using, the CMA reservation should not be used if it's
+ intended to dump userspce memory.
+
Boot into System Kernel
-----------------------
1) Update the boot loader (such as grub, yaboot, or lilo) configuration
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 65731b060e3f..ee9fc40a97fd 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -914,6 +914,13 @@
0: to disable low allocation.
It will be ignored when crashkernel=X,high is not used
or memory reserved is below 4G.
+ crashkernel=size[KMG],cma
+ [KNL, X86] Reserve additional crash kernel memory from CMA.
+ This reservation is usable by the 1st system's userspace,
+ so this should not be used if dumping of userspace
+ memory is intended. A standard crashkernel reservation,
+ as described above, is still needed to hold the crash
+ kernel and initrd.
cryptomgr.notests
[KNL] Disable crypto self-tests
--
Jiri Bohac <jbohac@xxxxxxx>
SUSE Labs, Prague, Czechia
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