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[S390] Add support for memory hot-add.

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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>
This commit is contained in:
Heiko Carstens 2008-07-14 09:59:18 +02:00
parent 0788fea4d5
commit 421c175c4d
4 changed files with 26 additions and 3 deletions
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4
arch/s390/Kconfig
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@ -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"

19
arch/s390/mm/init.c
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@ -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 */

4
include/asm-s390/sparsemem.h
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@ -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

2
mm/Kconfig
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@ -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