powerpc: implement vmemmap_remove_mapping() for BOOK3S

This is to be called in vmemmap_free(), leave the implementation on BOOK3E
empty as before.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Acked-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 23 insertions, 1 deletions

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 6b7c1c824cf9..daee7f4e5a14 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -243,7 +243,7 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG
-static int htab_remove_mapping(unsigned long vstart, unsigned long vend,
+int htab_remove_mapping(unsigned long vstart, unsigned long vend,
                       int psize, int ssize)
 {
         unsigned long vaddr;
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index fa5d28b4e726..69203c8afb51 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -212,6 +212,13 @@ static void __meminit vmemmap_create_mapping(unsigned long start,
         for (i = 0; i < page_size; i += PAGE_SIZE)
                 BUG_ON(map_kernel_page(start + i, phys, flags));
 }
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static void vmemmap_remove_mapping(unsigned long start,
+                                   unsigned long page_size)
+{
+}
+#endif
 #else /* CONFIG_PPC_BOOK3E */
 static void __meminit vmemmap_create_mapping(unsigned long start,
                                              unsigned long page_size,
@@ -223,6 +230,21 @@ static void __meminit vmemmap_create_mapping(unsigned long start,
                                         mmu_kernel_ssize);
         BUG_ON(mapped < 0);
 }
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+extern int htab_remove_mapping(unsigned long vstart, unsigned long vend,
+                        int psize, int ssize);
+
+static void vmemmap_remove_mapping(unsigned long start,
+                                   unsigned long page_size)
+{
+        int mapped = htab_remove_mapping(start, start + page_size,
+                                         mmu_vmemmap_psize,
+                                         mmu_kernel_ssize);
+        BUG_ON(mapped < 0);
+}
+#endif
+
 #endif /* CONFIG_PPC_BOOK3E */
 
 struct vmemmap_backing *vmemmap_list;