[S390] Add support for memory hot-add.
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 6d0d3165..5dc8f80 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -313,6 +313,10 @@
config ARCH_SELECT_MEMORY_MODEL
def_bool y
+config ARCH_ENABLE_MEMORY_HOTPLUG
+ def_bool y
+ depends on SPARSEMEM
+
source "mm/Kconfig"
comment "I/O subsystem configuration"
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 0559864..388cc74 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -202,3 +202,22 @@
}
}
#endif
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+int arch_add_memory(int nid, u64 start, u64 size)
+{
+ struct pglist_data *pgdat;
+ struct zone *zone;
+ int rc;
+
+ pgdat = NODE_DATA(nid);
+ zone = pgdat->node_zones + ZONE_NORMAL;
+ rc = vmem_add_mapping(start, size);
+ if (rc)
+ return rc;
+ rc = __add_pages(zone, PFN_DOWN(start), PFN_DOWN(size));
+ if (rc)
+ vmem_remove_mapping(start, size);
+ return rc;
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */
diff --git a/include/asm-s390/sparsemem.h b/include/asm-s390/sparsemem.h
index 06dfdab..545d219 100644
--- a/include/asm-s390/sparsemem.h
+++ b/include/asm-s390/sparsemem.h
@@ -1,15 +1,15 @@
#ifndef _ASM_S390_SPARSEMEM_H
#define _ASM_S390_SPARSEMEM_H
-#define SECTION_SIZE_BITS 25
-
#ifdef CONFIG_64BIT
+#define SECTION_SIZE_BITS 28
#define MAX_PHYSADDR_BITS 42
#define MAX_PHYSMEM_BITS 42
#else
+#define SECTION_SIZE_BITS 25
#define MAX_PHYSADDR_BITS 31
#define MAX_PHYSMEM_BITS 31
diff --git a/mm/Kconfig b/mm/Kconfig
index 3aa819d..4242743 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -129,7 +129,7 @@
bool "Allow for memory hot-add"
depends on SPARSEMEM || X86_64_ACPI_NUMA
depends on HOTPLUG && !HIBERNATION && ARCH_ENABLE_MEMORY_HOTPLUG
- depends on (IA64 || X86 || PPC64 || SUPERH)
+ depends on (IA64 || X86 || PPC64 || SUPERH || S390)
comment "Memory hotplug is currently incompatible with Software Suspend"
depends on SPARSEMEM && HOTPLUG && HIBERNATION