ARM: Remove DISCONTIGMEM support

Everything should now be using sparsemem rather than discontigmem, so
remove the code supporting discontigmem from ARM.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 116 insertions, 150 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index f6a999465323..4011e524cb1d 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -79,38 +79,37 @@ struct meminfo meminfo;
 void show_mem(void)
 {
         int free = 0, total = 0, reserved = 0;
-        int shared = 0, cached = 0, slab = 0, node, i;
+        int shared = 0, cached = 0, slab = 0, i;
         struct meminfo * mi = &meminfo;
 
         printk("Mem-info:\n");
         show_free_areas();
-        for_each_online_node(node) {
-                for_each_nodebank (i,mi,node) {
-                        struct membank *bank = &mi->bank[i];
-                        unsigned int pfn1, pfn2;
-                        struct page *page, *end;
-
-                        pfn1 = bank_pfn_start(bank);
-                        pfn2 = bank_pfn_end(bank);
-
-                        page = pfn_to_page(pfn1);
-                        end  = pfn_to_page(pfn2 - 1) + 1;
-
-                        do {
-                                total++;
-                                if (PageReserved(page))
-                                        reserved++;
-                                else if (PageSwapCache(page))
-                                        cached++;
-                                else if (PageSlab(page))
-                                        slab++;
-                                else if (!page_count(page))
-                                        free++;
-                                else
-                                        shared += page_count(page) - 1;
-                                page++;
-                        } while (page < end);
-                }
+
+        for_each_bank (i, mi) {
+                struct membank *bank = &mi->bank[i];
+                unsigned int pfn1, pfn2;
+                struct page *page, *end;
+
+                pfn1 = bank_pfn_start(bank);
+                pfn2 = bank_pfn_end(bank);
+
+                page = pfn_to_page(pfn1);
+                end  = pfn_to_page(pfn2 - 1) + 1;
+
+                do {
+                        total++;
+                        if (PageReserved(page))
+                                reserved++;
+                        else if (PageSwapCache(page))
+                                cached++;
+                        else if (PageSlab(page))
+                                slab++;
+                        else if (!page_count(page))
+                                free++;
+                        else
+                                shared += page_count(page) - 1;
+                        page++;
+                } while (page < end);
         }
 
         printk("%d pages of RAM\n", total);
@@ -121,7 +120,7 @@ void show_mem(void)
         printk("%d pages swap cached\n", cached);
 }
 
-static void __init find_node_limits(int node, struct meminfo *mi,
+static void __init find_limits(struct meminfo *mi,
         unsigned long *min, unsigned long *max_low, unsigned long *max_high)
 {
         int i;
@@ -129,7 +128,7 @@ static void __init find_node_limits(int node, struct meminfo *mi,
         *min = -1UL;
         *max_low = *max_high = 0;
 
-        for_each_nodebank(i, mi, node) {
+        for_each_bank (i, mi) {
                 struct membank *bank = &mi->bank[i];
                 unsigned long start, end;
 
@@ -154,14 +153,14 @@ static void __init find_node_limits(int node, struct meminfo *mi,
  * the end, we won't clash.
  */
 static unsigned int __init
-find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
+find_bootmap_pfn(struct meminfo *mi, unsigned int bootmap_pages)
 {
         unsigned int start_pfn, i, bootmap_pfn;
 
         start_pfn   = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
         bootmap_pfn = 0;
 
-        for_each_nodebank(i, mi, node) {
+        for_each_bank(i, mi) {
                 struct membank *bank = &mi->bank[i];
                 unsigned int start, end;
 
@@ -191,7 +190,7 @@ find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
 
 static int __init check_initrd(struct meminfo *mi)
 {
-        int initrd_node = -2;
+        int initrd = -2;
 #ifdef CONFIG_BLK_DEV_INITRD
         unsigned long end = phys_initrd_start + phys_initrd_size;
 
@@ -202,17 +201,17 @@ static int __init check_initrd(struct meminfo *mi)
         if (phys_initrd_size) {
                 unsigned int i;
 
-                initrd_node = -1;
+                initrd = -1;
 
                 for (i = 0; i < mi->nr_banks; i++) {
                         struct membank *bank = &mi->bank[i];
                         if (bank_phys_start(bank) <= phys_initrd_start &&
                             end <= bank_phys_end(bank))
-                                initrd_node = bank->node;
+                                initrd = 0;
                 }
         }
 
-        if (initrd_node == -1) {
+        if (initrd == -1) {
                 printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
                        "physical memory - disabling initrd\n",
                        phys_initrd_start, phys_initrd_size);
@@ -220,10 +219,10 @@ static int __init check_initrd(struct meminfo *mi)
         }
 #endif
 
-        return initrd_node;
+        return initrd;
 }
 
-static void __init bootmem_init_node(int node, struct meminfo *mi,
+static void __init arm_bootmem_init(struct meminfo *mi,
         unsigned long start_pfn, unsigned long end_pfn)
 {
         unsigned long boot_pfn;
@@ -235,37 +234,36 @@ static void __init bootmem_init_node(int node, struct meminfo *mi,
          * Allocate the bootmem bitmap page.
          */
         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
-        boot_pfn = find_bootmap_pfn(node, mi, boot_pages);
+        boot_pfn = find_bootmap_pfn(mi, boot_pages);
 
         /*
-         * Initialise the bootmem allocator for this node, handing the
+         * Initialise the bootmem allocator, handing the
          * memory banks over to bootmem.
          */
-        node_set_online(node);
-        pgdat = NODE_DATA(node);
+        node_set_online(0);
+        pgdat = NODE_DATA(0);
         init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
 
-        for_each_nodebank(i, mi, node) {
+        for_each_bank(i, mi) {
                 struct membank *bank = &mi->bank[i];
                 if (!bank->highmem)
-                        free_bootmem_node(pgdat, bank_phys_start(bank), bank_phys_size(bank));
+                        free_bootmem(bank_phys_start(bank), bank_phys_size(bank));
         }
 
         /*
-         * Reserve the bootmem bitmap for this node.
+         * Reserve the bootmem bitmap.
          */
-        reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
-                             boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
+        reserve_bootmem(boot_pfn << PAGE_SHIFT,
+                        boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
 }
 
-static void __init bootmem_reserve_initrd(int node)
+static void __init bootmem_reserve_initrd(void)
 {
 #ifdef CONFIG_BLK_DEV_INITRD
-        pg_data_t *pgdat = NODE_DATA(node);
         int res;
 
-        res = reserve_bootmem_node(pgdat, phys_initrd_start,
-                             phys_initrd_size, BOOTMEM_EXCLUSIVE);
+        res = reserve_bootmem(phys_initrd_start,
+                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
 
         if (res == 0) {
                 initrd_start = __phys_to_virt(phys_initrd_start);
@@ -279,23 +277,23 @@ static void __init bootmem_reserve_initrd(int node)
 #endif
 }
 
-static void __init bootmem_free_node(int node, struct meminfo *mi)
+static void __init arm_bootmem_free(struct meminfo *mi)
 {
         unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
         unsigned long min, max_low, max_high;
         int i;
 
-        find_node_limits(node, mi, &min, &max_low, &max_high);
+        find_limits(mi, &min, &max_low, &max_high);
 
         /*
-         * initialise the zones within this node.
+         * initialise the zones.
          */
         memset(zone_size, 0, sizeof(zone_size));
 
         /*
-         * The size of this node has already been determined.  If we need
-         * to do anything fancy with the allocation of this memory to the
-         * zones, now is the time to do it.
+         * The memory size has already been determined.  If we need
+         * to do anything fancy with the allocation of this memory
+         * to the zones, now is the time to do it.
          */
         zone_size[0] = max_low - min;
 #ifdef CONFIG_HIGHMEM
@@ -303,11 +301,11 @@ static void __init bootmem_free_node(int node, struct meminfo *mi)
 #endif
 
         /*
-         * For each bank in this node, calculate the size of the holes.
-         *  holes = node_size - sum(bank_sizes_in_node)
+         * Calculate the size of the holes.
+         *  holes = node_size - sum(bank_sizes)
          */
         memcpy(zhole_size, zone_size, sizeof(zhole_size));
-        for_each_nodebank(i, mi, node) {
+        for_each_bank(i, mi) {
                 int idx = 0;
 #ifdef CONFIG_HIGHMEM
                 if (mi->bank[i].highmem)
@@ -320,9 +318,9 @@ static void __init bootmem_free_node(int node, struct meminfo *mi)
          * Adjust the sizes according to any special requirements for
          * this machine type.
          */
-        arch_adjust_zones(node, zone_size, zhole_size);
+        arch_adjust_zones(0, zone_size, zhole_size);
 
-        free_area_init_node(node, zone_size, min, zhole_size);
+        free_area_init_node(0, zone_size, min, zhole_size);
 }
 
 #ifndef CONFIG_SPARSEMEM
@@ -346,16 +344,16 @@ int pfn_valid(unsigned long pfn)
 }
 EXPORT_SYMBOL(pfn_valid);
 
-static void arm_memory_present(struct meminfo *mi, int node)
+static void arm_memory_present(struct meminfo *mi)
 {
 }
 #else
-static void arm_memory_present(struct meminfo *mi, int node)
+static void arm_memory_present(struct meminfo *mi)
 {
         int i;
-        for_each_nodebank(i, mi, node) {
+        for_each_bank(i, mi) {
                 struct membank *bank = &mi->bank[i];
-                memory_present(node, bank_pfn_start(bank), bank_pfn_end(bank));
+                memory_present(0, bank_pfn_start(bank), bank_pfn_end(bank));
         }
 }
 #endif
@@ -364,55 +362,35 @@ void __init bootmem_init(void)
 {
         struct meminfo *mi = &meminfo;
         unsigned long min, max_low, max_high;
-        int node, initrd_node;
+        int initrd;
 
         /*
-         * Locate which node contains the ramdisk image, if any.
+         * Locate the ramdisk image, if any.
          */
-        initrd_node = check_initrd(mi);
+        initrd = check_initrd(mi);
 
         max_low = max_high = 0;
 
-        /*
-         * Run through each node initialising the bootmem allocator.
-         */
-        for_each_node(node) {
-                unsigned long node_low, node_high;
-
-                find_node_limits(node, mi, &min, &node_low, &node_high);
+        find_limits(mi, &min, &max_low, &max_high);
 
-                if (node_low > max_low)
-                        max_low = node_low;
-                if (node_high > max_high)
-                        max_high = node_high;
+        arm_bootmem_init(mi, min, max_low);
 
-                /*
-                 * If there is no memory in this node, ignore it.
-                 * (We can't have nodes which have no lowmem)
-                 */
-                if (node_low == 0)
-                        continue;
-
-                bootmem_init_node(node, mi, min, node_low);
-
-                /*
-                 * Reserve any special node zero regions.
-                 */
-                if (node == 0)
-                        reserve_node_zero(NODE_DATA(node));
+        /*
+         * Reserve any special regions.
+         */
+        reserve_special_regions();
 
-                /*
-                 * If the initrd is in this node, reserve its memory.
-                 */
-                if (node == initrd_node)
-                        bootmem_reserve_initrd(node);
+        /*
+         * If the initrd is present, reserve its memory.
+         */
+        if (initrd == 0)
+                bootmem_reserve_initrd();
 
-                /*
-                 * Sparsemem tries to allocate bootmem in memory_present(),
-                 * so must be done after the fixed reservations
-                 */
-                arm_memory_present(mi, node);
-        }
+        /*
+         * Sparsemem tries to allocate bootmem in memory_present(),
+         * so must be done after the fixed reservations
+         */
+        arm_memory_present(mi);
 
         /*
          * sparse_init() needs the bootmem allocator up and running.
@@ -420,12 +398,11 @@ void __init bootmem_init(void)
         sparse_init();
 
         /*
-         * Now free memory in each node - free_area_init_node needs
+         * Now free the memory - free_area_init_node needs
          * the sparse mem_map arrays initialized by sparse_init()
          * for memmap_init_zone(), otherwise all PFNs are invalid.
          */
-        for_each_node(node)
-                bootmem_free_node(node, mi);
+        arm_bootmem_free(mi);
 
         high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
 
@@ -460,7 +437,7 @@ static inline int free_area(unsigned long pfn, unsigned long end, char *s)
 }
 
 static inline void
-free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
+free_memmap(unsigned long start_pfn, unsigned long end_pfn)
 {
         struct page *start_pg, *end_pg;
         unsigned long pg, pgend;
@@ -483,13 +460,13 @@ free_memmap(int node, unsigned long start_pfn, unsigned long end_pfn)
          * free the section of the memmap array.
          */
         if (pg < pgend)
-                free_bootmem_node(NODE_DATA(node), pg, pgend - pg);
+                free_bootmem(pg, pgend - pg);
 }
 
 /*
  * The mem_map array can get very big.  Free the unused area of the memory map.
  */
-static void __init free_unused_memmap_node(int node, struct meminfo *mi)
+static void __init free_unused_memmap(struct meminfo *mi)
 {
         unsigned long bank_start, prev_bank_end = 0;
         unsigned int i;
@@ -499,7 +476,7 @@ static void __init free_unused_memmap_node(int node, struct meminfo *mi)
          * may not be the case, especially if the user has provided the
          * information on the command line.
          */
-        for_each_nodebank(i, mi, node) {
+        for_each_bank(i, mi) {
                 struct membank *bank = &mi->bank[i];
 
                 bank_start = bank_pfn_start(bank);
@@ -514,7 +491,7 @@ static void __init free_unused_memmap_node(int node, struct meminfo *mi)
                  * between the current bank and the previous, free it.
                  */
                 if (prev_bank_end && prev_bank_end != bank_start)
-                        free_memmap(node, prev_bank_end, bank_start);
+                        free_memmap(prev_bank_end, bank_start);
 
                 prev_bank_end = bank_pfn_end(bank);
         }
@@ -528,21 +505,14 @@ static void __init free_unused_memmap_node(int node, struct meminfo *mi)
 void __init mem_init(void)
 {
         unsigned long reserved_pages, free_pages;
-        int i, node;
+        int i;
 
-#ifndef CONFIG_DISCONTIGMEM
         max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
-#endif
 
         /* this will put all unused low memory onto the freelists */
-        for_each_online_node(node) {
-                pg_data_t *pgdat = NODE_DATA(node);
-
-                free_unused_memmap_node(node, &meminfo);
+        free_unused_memmap(&meminfo);
 
-                if (pgdat->node_spanned_pages != 0)
-                        totalram_pages += free_all_bootmem_node(pgdat);
-        }
+        totalram_pages += free_all_bootmem();
 
 #ifdef CONFIG_SA1111
         /* now that our DMA memory is actually so designated, we can free it */
@@ -552,39 +522,35 @@ void __init mem_init(void)
 
 #ifdef CONFIG_HIGHMEM
         /* set highmem page free */
-        for_each_online_node(node) {
-                for_each_nodebank (i, &meminfo, node) {
-                        unsigned long start = bank_pfn_start(&meminfo.bank[i]);
-                        unsigned long end = bank_pfn_end(&meminfo.bank[i]);
-                        if (start >= max_low_pfn + PHYS_PFN_OFFSET)
-                                totalhigh_pages += free_area(start, end, NULL);
-                }
+        for_each_bank (i, &meminfo) {
+                unsigned long start = bank_pfn_start(&meminfo.bank[i]);
+                unsigned long end = bank_pfn_end(&meminfo.bank[i]);
+                if (start >= max_low_pfn + PHYS_PFN_OFFSET)
+                        totalhigh_pages += free_area(start, end, NULL);
         }
         totalram_pages += totalhigh_pages;
 #endif
 
         reserved_pages = free_pages = 0;
 
-        for_each_online_node(node) {
-                for_each_nodebank(i, &meminfo, node) {
-                        struct membank *bank = &meminfo.bank[i];
-                        unsigned int pfn1, pfn2;
-                        struct page *page, *end;
-
-                        pfn1 = bank_pfn_start(bank);
-                        pfn2 = bank_pfn_end(bank);
-
-                        page = pfn_to_page(pfn1);
-                        end  = pfn_to_page(pfn2 - 1) + 1;
-
-                        do {
-                                if (PageReserved(page))
-                                        reserved_pages++;
-                                else if (!page_count(page))
-                                        free_pages++;
-                                page++;
-                        } while (page < end);
-                }
+        for_each_bank(i, &meminfo) {
+                struct membank *bank = &meminfo.bank[i];
+                unsigned int pfn1, pfn2;
+                struct page *page, *end;
+
+                pfn1 = bank_pfn_start(bank);
+                pfn2 = bank_pfn_end(bank);
+
+                page = pfn_to_page(pfn1);
+                end  = pfn_to_page(pfn2 - 1) + 1;
+
+                do {
+                        if (PageReserved(page))
+                                reserved_pages++;
+                        else if (!page_count(page))
+                                free_pages++;
+                        page++;
+                } while (page < end);
         }
 
         /*