mmots: memory-hotplug-remove-memmap-of-sparse-vmemmap.patch compile fix

[Michal Hocko <mhocko@suse.cz>]

Defconfig for x86_64 complains:
arch/x86/mm/init_64.c: In function a??vmemmap_freea??:
arch/x86/mm/init_64.c:1317: error: implicit declaration of function a??remove_pagetablea??

vmemmap_free is only used for CONFIG_MEMORY_HOTPLUG so let's move it
inside ifdef

Signed-off-by: Michal Hocko <mhocko@suse.cz>
---
 arch/x86/mm/init_64.c |   16 ++++++++--------
 include/linux/mm.h    |    2 ++
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 9920ffc..ddd3b58 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -981,6 +981,14 @@ remove_pagetable(unsigned long start, unsigned long end, bool direct)
 	flush_tlb_all();
 }
 
+void __ref vmemmap_free(struct page *memmap, unsigned long nr_pages)
+{
+	unsigned long start = (unsigned long)memmap;
+	unsigned long end = (unsigned long)(memmap + nr_pages);
+
+	remove_pagetable(start, end, false);
+}
+
 static void __meminit
 kernel_physical_mapping_remove(unsigned long start, unsigned long end)
 {
@@ -1309,14 +1317,6 @@ vmemmap_populate(struct page *start_page, unsigned long size, int node)
 	return 0;
 }
 
-void __ref vmemmap_free(struct page *memmap, unsigned long nr_pages)
-{
-	unsigned long start = (unsigned long)memmap;
-	unsigned long end = (unsigned long)(memmap + nr_pages);
-
-	remove_pagetable(start, end, false);
-}
-
 void register_page_bootmem_memmap(unsigned long section_nr,
 				  struct page *start_page, unsigned long size)
 {
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 0d880df..7c57bd0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1721,7 +1721,9 @@ int vmemmap_populate_basepages(struct page *start_page,
 						unsigned long pages, int node);
 int vmemmap_populate(struct page *start_page, unsigned long pages, int node);
 void vmemmap_populate_print_last(void);
+#ifdef CONFIG_MEMORY_HOTPLUG
 void vmemmap_free(struct page *memmap, unsigned long nr_pages);
+#endif
 void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
 				  unsigned long size);
 
-- 
1.7.10.4

-- 
Michal Hocko
SUSE Labs

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