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authorHeiko Carstens <heiko.carstens@de.ibm.com>2008-07-14 09:59:18 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2008-07-14 10:02:16 +0200
commit421c175c4d609864350df495b34d3e99f9fb1bdd (patch)
treeea3ade04452a6a6c578ae7895b5451c1bf231bc9 /arch/s390
parent0788fea4d583a3b7d199696819940ff3387d79a3 (diff)
downloadop-kernel-dev-421c175c4d609864350df495b34d3e99f9fb1bdd.zip
op-kernel-dev-421c175c4d609864350df495b34d3e99f9fb1bdd.tar.gz
[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>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/Kconfig4
-rw-r--r--arch/s390/mm/init.c19
2 files changed, 23 insertions, 0 deletions
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_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
--- 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 */
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