[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 6d0d316..5dc8f80 100644 (file)
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -313,6 +313,10 @@ config ARCH_SPARSEMEM_DEFAULT
 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 (file)
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -202,3 +202,22 @@ void free_initrd_mem(unsigned long start, unsigned long end)
         }
 }
 #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 (file)
--- 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 (file)
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -129,7 +129,7 @@ config MEMORY_HOTPLUG
        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