s390/kdump: Account /sys/kernel/kexec_crash_size changes in OS info

The crashkernel size for kdump can be reduced at runtime with the
sysfs file "/sys/kernel/kexec_crash_size". Currently those changes
do not update the OS info crashkernel information that is used
for stand-alone kdump. With this fix now also the OS info crashkernel
information is updated correctly.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index bdad47d54478..03d2027d656a 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -24,6 +24,7 @@
 #include <asm/ipl.h>
 #include <asm/diag.h>
 #include <asm/asm-offsets.h>
+#include <asm/os_info.h>
 
 typedef void (*relocate_kernel_t)(kimage_entry_t *, unsigned long);
 
@@ -114,8 +115,13 @@ static void crash_map_pages(int enable)
                size % KEXEC_CRASH_MEM_ALIGN);
         if (enable)
                 vmem_add_mapping(crashk_res.start, size);
-        else
+        else {
                 vmem_remove_mapping(crashk_res.start, size);
+                if (size)
+                        os_info_crashkernel_add(crashk_res.start, size);
+                else
+                        os_info_crashkernel_add(0, 0);
+        }
 }
 
 /*