sh: Add support for memory hot-remove.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 21 insertions, 0 deletions

diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 8a03926ea84f..f8e6dc5e056f 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -134,6 +134,10 @@ config ARCH_ENABLE_MEMORY_HOTPLUG
         def_bool y
         depends on SPARSEMEM
 
+config ARCH_ENABLE_MEMORY_HOTREMOVE
+        def_bool y
+        depends on SPARSEMEM
+
 config ARCH_MEMORY_PROBE
         def_bool y
         depends on MEMORY_HOTPLUG
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index b75a7acd62fb..d4681a55c852 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -292,4 +292,21 @@ int memory_add_physaddr_to_nid(u64 addr)
 }
 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 #endif
+
+#ifdef CONFIG_MEMORY_HOTREMOVE
+int remove_memory(u64 start, u64 size)
+{
+        unsigned long start_pfn = start >> PAGE_SHIFT;
+        unsigned long end_pfn = start_pfn + (size >> PAGE_SHIFT);
+        int ret;
+
+        ret = offline_pages(start_pfn, end_pfn, 120 * HZ);
+        if (unlikely(ret))
+                printk("%s: Failed, offline_pages() == %d\n", __func__, ret);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(remove_memory);
 #endif
+
+#endif /* CONFIG_MEMORY_HOTPLUG */