m68k: discontinuous memory support

[linux-drm-fsl-dcu.git] / mm / sparse.c

diff --git a/mm/sparse.c b/mm/sparse.c
index 86c52ab80878f1df2239ae9270c5f49b643ab1b0..1302f8348d51c8dbc10d104c333eeea3e01a6f1a 100644 (file)
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -24,8 +24,27 @@ struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
 #endif
 EXPORT_SYMBOL(mem_section);
 
+#ifdef NODE_NOT_IN_PAGE_FLAGS
+/*
+ * If we did not store the node number in the page then we have to
+ * do a lookup in the section_to_node_table in order to find which
+ * node the page belongs to.
+ */
+#if MAX_NUMNODES <= 256
+static u8 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
+#else
+static u16 section_to_node_table[NR_MEM_SECTIONS] __cacheline_aligned;
+#endif
+
+int page_to_nid(struct page *page)
+{
+       return section_to_node_table[page_to_section(page)];
+}
+EXPORT_SYMBOL(page_to_nid);
+#endif
+
 #ifdef CONFIG_SPARSEMEM_EXTREME
-static struct mem_section *sparse_index_alloc(int nid)
+static struct mem_section noinline __init_refok *sparse_index_alloc(int nid)
 {
        struct mem_section *section = NULL;
        unsigned long array_size = SECTIONS_PER_ROOT *
@@ -42,13 +61,17 @@ static struct mem_section *sparse_index_alloc(int nid)
        return section;
 }
 
-static int sparse_index_init(unsigned long section_nr, int nid)
+static int __meminit sparse_index_init(unsigned long section_nr, int nid)
 {
        static DEFINE_SPINLOCK(index_init_lock);
        unsigned long root = SECTION_NR_TO_ROOT(section_nr);
        struct mem_section *section;
        int ret = 0;
 
+#ifdef NODE_NOT_IN_PAGE_FLAGS
+       section_to_node_table[section_nr] = nid;
+#endif
+
        if (mem_section[root])
                return -EEXIST;
 
@@ -115,7 +138,7 @@ static inline int sparse_early_nid(struct mem_section *section)
 }
 
 /* Record a memory area against a node. */
-void memory_present(int nid, unsigned long start, unsigned long end)
+void __init memory_present(int nid, unsigned long start, unsigned long end)
 {
        unsigned long pfn;
 
@@ -174,7 +197,7 @@ struct page *sparse_decode_mem_map(unsigned long coded_mem_map, unsigned long pn
        return ((struct page *)coded_mem_map) + section_nr_to_pfn(pnum);
 }
 
-static int sparse_init_one_section(struct mem_section *ms,
+static int __meminit sparse_init_one_section(struct mem_section *ms,
                unsigned long pnum, struct page *mem_map)
 {
        if (!valid_section(ms))
@@ -186,7 +209,7 @@ static int sparse_init_one_section(struct mem_section *ms,
        return 1;
 }
 
-static struct page *sparse_early_mem_map_alloc(unsigned long pnum)
+static struct page __init *sparse_early_mem_map_alloc(unsigned long pnum)
 {
        struct page *map;
        struct mem_section *ms = __nr_to_section(pnum);
@@ -211,7 +234,7 @@ static struct page *__kmalloc_section_memmap(unsigned long nr_pages)
        struct page *page, *ret;
        unsigned long memmap_size = sizeof(struct page) * nr_pages;
 
-       page = alloc_pages(GFP_KERNEL, get_order(memmap_size));
+       page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
        if (page)
                goto got_map_page;
 
@@ -249,7 +272,7 @@ static void __kfree_section_memmap(struct page *memmap, unsigned long nr_pages)
  * Allocate the accumulated non-linear sections, allocate a mem_map
  * for each and record the physical to section mapping.
  */
-void sparse_init(void)
+void __init sparse_init(void)
 {
        unsigned long pnum;
        struct page *map;
@@ -265,6 +288,7 @@ void sparse_init(void)
        }
 }
 
+#ifdef CONFIG_MEMORY_HOTPLUG
 /*
  * returns the number of sections whose mem_maps were properly
  * set.  If this is <=0, then that means that the passed-in
@@ -304,3 +328,4 @@ out:
                __kfree_section_memmap(memmap, nr_pages);
        return ret;
 }
+#endif