mm, hotplug: avoid compiling memory hotremove functions when disabled

[mirror_ubuntu-focal-kernel.git] / mm / sparse.c

diff --git a/mm/sparse.c b/mm/sparse.c
index a37be5f9050d62c54588b19fdeb9941b73d0b460..1c91f0d3f6ab4a16476a0953d02b8e61331521ac 100644 (file)
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -620,6 +620,7 @@ static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
 
        vmemmap_free(start, end);
 }
+#ifdef CONFIG_MEMORY_HOTREMOVE
 static void free_map_bootmem(struct page *memmap, unsigned long nr_pages)
 {
        unsigned long start = (unsigned long)memmap;
@@ -627,6 +628,7 @@ static void free_map_bootmem(struct page *memmap, unsigned long nr_pages)
 
        vmemmap_free(start, end);
 }
+#endif /* CONFIG_MEMORY_HOTREMOVE */
 #else
 static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
 {
@@ -664,6 +666,7 @@ static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
                           get_order(sizeof(struct page) * nr_pages));
 }
 
+#ifdef CONFIG_MEMORY_HOTREMOVE
 static void free_map_bootmem(struct page *memmap, unsigned long nr_pages)
 {
        unsigned long maps_section_nr, removing_section_nr, i;
@@ -690,40 +693,9 @@ static void free_map_bootmem(struct page *memmap, unsigned long nr_pages)
                        put_page_bootmem(page);
        }
 }
+#endif /* CONFIG_MEMORY_HOTREMOVE */
 #endif /* CONFIG_SPARSEMEM_VMEMMAP */
 
-static void free_section_usemap(struct page *memmap, unsigned long *usemap)
-{
-       struct page *usemap_page;
-       unsigned long nr_pages;
-
-       if (!usemap)
-               return;
-
-       usemap_page = virt_to_page(usemap);
-       /*
-        * Check to see if allocation came from hot-plug-add
-        */
-       if (PageSlab(usemap_page) || PageCompound(usemap_page)) {
-               kfree(usemap);
-               if (memmap)
-                       __kfree_section_memmap(memmap, PAGES_PER_SECTION);
-               return;
-       }
-
-       /*
-        * The usemap came from bootmem. This is packed with other usemaps
-        * on the section which has pgdat at boot time. Just keep it as is now.
-        */
-
-       if (memmap) {
-               nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
-                       >> PAGE_SHIFT;
-
-               free_map_bootmem(memmap, nr_pages);
-       }
-}
-
 /*
  * returns the number of sections whose mem_maps were properly
  * set.  If this is <=0, then that means that the passed-in
@@ -800,6 +772,39 @@ static inline void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
 }
 #endif
 
+#ifdef CONFIG_MEMORY_HOTREMOVE
+static void free_section_usemap(struct page *memmap, unsigned long *usemap)
+{
+       struct page *usemap_page;
+       unsigned long nr_pages;
+
+       if (!usemap)
+               return;
+
+       usemap_page = virt_to_page(usemap);
+       /*
+        * Check to see if allocation came from hot-plug-add
+        */
+       if (PageSlab(usemap_page) || PageCompound(usemap_page)) {
+               kfree(usemap);
+               if (memmap)
+                       __kfree_section_memmap(memmap, PAGES_PER_SECTION);
+               return;
+       }
+
+       /*
+        * The usemap came from bootmem. This is packed with other usemaps
+        * on the section which has pgdat at boot time. Just keep it as is now.
+        */
+
+       if (memmap) {
+               nr_pages = PAGE_ALIGN(PAGES_PER_SECTION * sizeof(struct page))
+                       >> PAGE_SHIFT;
+
+               free_map_bootmem(memmap, nr_pages);
+       }
+}
+
 void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
 {
        struct page *memmap = NULL;
@@ -819,4 +824,5 @@ void sparse_remove_one_section(struct zone *zone, struct mem_section *ms)
        clear_hwpoisoned_pages(memmap, PAGES_PER_SECTION);
        free_section_usemap(memmap, usemap);
 }
-#endif
+#endif /* CONFIG_MEMORY_HOTREMOVE */
+#endif /* CONFIG_MEMORY_HOTPLUG */