[S390] Add support for memory hot-remove.
This patch enables memory hot-remove on s390.
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 2ed8812..8d41908 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -317,6 +317,9 @@
def_bool y
depends on SPARSEMEM
+config ARCH_ENABLE_MEMORY_HOTREMOVE
+ def_bool y
+
source "mm/Kconfig"
comment "I/O subsystem configuration"
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 4993b0f..1169130 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -179,7 +179,7 @@
int rc;
pgdat = NODE_DATA(nid);
- zone = pgdat->node_zones + ZONE_NORMAL;
+ zone = pgdat->node_zones + ZONE_MOVABLE;
rc = vmem_add_mapping(start, size);
if (rc)
return rc;
@@ -189,3 +189,14 @@
return rc;
}
#endif /* CONFIG_MEMORY_HOTPLUG */
+
+#ifdef CONFIG_MEMORY_HOTREMOVE
+int remove_memory(u64 start, u64 size)
+{
+ unsigned long start_pfn, end_pfn;
+
+ start_pfn = PFN_DOWN(start);
+ end_pfn = start_pfn + PFN_DOWN(size);
+ return offline_pages(start_pfn, end_pfn, 120 * HZ);
+}
+#endif /* CONFIG_MEMORY_HOTREMOVE */