aboutsummaryrefslogtreecommitdiff
path: root/arch/sh/mm
diff options
context:
space:
mode:
authorPaul Mundt <lethal@linux-sh.org>2007-06-07 11:32:52 +0900
committerPaul Mundt <lethal@hera.kernel.org>2007-06-08 02:43:51 +0000
commit33d63bd83bf9aa6b662a376a96b825acba721e8f (patch)
tree469eadf218a6e435b06eb151c88340c0adb7b83e /arch/sh/mm
parent05a117847b43d44f336bbf272a1063661431a5e5 (diff)
downloadlinux-2.6.34-ux500-33d63bd83bf9aa6b662a376a96b825acba721e8f.tar.gz
sh: memory hot-add for sparsemem users support.
This enables simple hotplug support for sparsemem users. Presently this only permits memory being added in to node 0 on ZONE_NORMAL. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm')
-rw-r--r--arch/sh/mm/Kconfig8
-rw-r--r--arch/sh/mm/init.c42
2 files changed, 50 insertions, 0 deletions
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index c713d13fcca..0c24abdd4ea 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -331,6 +331,14 @@ config ARCH_POPULATES_NODE_MAP
config ARCH_SELECT_MEMORY_MODEL
def_bool y
+config ARCH_ENABLE_MEMORY_HOTPLUG
+ def_bool y
+ depends on SPARSEMEM
+
+config ARCH_MEMORY_PROBE
+ def_bool y
+ depends on MEMORY_HOTPLUG
+
choice
prompt "Kernel page size"
default PAGE_SIZE_4KB
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 753e11d5e62..40d4e798e7f 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -265,3 +265,45 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+void online_page(struct page *page)
+{
+ ClearPageReserved(page);
+ init_page_count(page);
+ __free_page(page);
+ totalram_pages++;
+ num_physpages++;
+}
+
+int arch_add_memory(int nid, u64 start, u64 size)
+{
+ pg_data_t *pgdat;
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+ int ret;
+
+ pgdat = NODE_DATA(nid);
+
+ /* We only have ZONE_NORMAL, so this is easy.. */
+ ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages);
+ if (unlikely(ret))
+ printk("%s: Failed, __add_pages() == %d\n", __FUNCTION__, ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(arch_add_memory);
+
+int remove_memory(u64 start, u64 size)
+{
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
+
+int memory_add_physaddr_to_nid(u64 addr)
+{
+ /* Node 0 for now.. */
+ return 0;
+}
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif