[PATCH v1 8/8] Documentation: kdump: Add s390 to crashkernel CMA

[Mikhail Zaslonko]

Add s390 to the architectures supporting crashkernel=size,cma and
mention that on s390 only kexec_file_load() passes the CMA memory on to
the kdump kernel.

Signed-off-by: Mikhail Zaslonko <zaslonko@xxxxxxxxxxxxx>
---
 Documentation/admin-guide/kdump/kdump.rst       | 3 +++
 Documentation/admin-guide/kernel-parameters.txt | 4 ++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/kdump/kdump.rst b/Documentation/admin-guide/kdump/kdump.rst
index 7587caadbae1..7952e8aca67a 100644
--- a/Documentation/admin-guide/kdump/kdump.rst
+++ b/Documentation/admin-guide/kdump/kdump.rst
@@ -332,6 +332,9 @@ crashkernel syntax
 	less reliable and possibly incomplete kdump is preferable to no kdump at
 	all.
 
+	On s390 the CMA memory is passed on only to a crash kernel loaded with
+	kexec_file_load(), e.g. with "kexec -s -p".
+
 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 0b3c140babd9..1627c934324c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1099,8 +1099,8 @@ Kernel parameters
 			It will be ignored when crashkernel=X,high is not used
 			or memory reserved is below 4G.
 	crashkernel=size[KMG],cma
-			[KNL, X86, ARM64, RISCV, PPC] Reserve additional crash
-			kernel memory from CMA. This reservation is usable by
+			[KNL, X86, ARM64, RISCV, PPC, S390] Reserve additional
+			crash kernel memory from CMA. This reservation is usable by
 			the first system's userspace memory and kernel movable
 			allocations (memory balloon, zswap). Pages allocated
 			from this memory range will not be included in the vmcore
-- 
2.55.0