sh: bootmem tidying for discontig/sparsemem preparation.

This reworks some of the node 0 bootmem initialization in
preparation for discontigmem and sparsemem support.

ARCH_POPULATES_NODE_MAP is switched to as a result of this.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 103 insertions, 105 deletions

diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 3cac22f50e15..5359f3dff93c 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -291,6 +291,17 @@ config VSYSCALL
           For systems with an MMU that can afford to give up a page,
           (the default value) say Y.
 
+config NODES_SHIFT
+        int
+        default "1"
+        depends on NEED_MULTIPLE_NODES
+
+config ARCH_FLATMEM_ENABLE
+        def_bool y
+
+config ARCH_POPULATES_NODE_MAP
+        def_bool y
+
 choice
         prompt "Kernel page size"
         default PAGE_SIZE_4KB
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index ae957a932375..4d030988b368 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -1,37 +1,20 @@
-/* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $
- *
- *  linux/arch/sh/mm/init.c
+/*
+ * linux/arch/sh/mm/init.c
  *
  *  Copyright (C) 1999  Niibe Yutaka
- *  Copyright (C) 2002, 2004  Paul Mundt
+ *  Copyright (C) 2002 - 2007  Paul Mundt
  *
  *  Based on linux/arch/i386/mm/init.c:
  *   Copyright (C) 1995  Linus Torvalds
  */
-
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
 #include <linux/mm.h>
 #include <linux/swap.h>
-#include <linux/smp.h>
 #include <linux/init.h>
-#include <linux/highmem.h>
 #include <linux/bootmem.h>
-#include <linux/pagemap.h>
 #include <linux/proc_fs.h>
-#include <asm/processor.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/pgalloc.h>
+#include <linux/percpu.h>
+#include <linux/io.h>
 #include <asm/mmu_context.h>
-#include <asm/io.h>
 #include <asm/tlb.h>
 #include <asm/cacheflush.h>
 #include <asm/cache.h>
@@ -39,37 +22,51 @@
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 pgd_t swapper_pg_dir[PTRS_PER_PGD];
 
-#ifdef CONFIG_MMU
-/* It'd be good if these lines were in the standard header file. */
-#define START_PFN       (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
-#define MAX_LOW_PFN     (NODE_DATA(0)->bdata->node_low_pfn)
-#endif
-
 void (*copy_page)(void *from, void *to);
 void (*clear_page)(void *to);
 
 void show_mem(void)
 {
-        int i, total = 0, reserved = 0;
-        int shared = 0, cached = 0;
+        int total = 0, reserved = 0, free = 0;
+        int shared = 0, cached = 0, slab = 0;
+        pg_data_t *pgdat;
 
         printk("Mem-info:\n");
         show_free_areas();
-        printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
-        i = max_mapnr;
-        while (i-- > 0) {
-                total++;
-                if (PageReserved(mem_map+i))
-                        reserved++;
-                else if (PageSwapCache(mem_map+i))
-                        cached++;
-                else if (page_count(mem_map+i))
-                        shared += page_count(mem_map+i) - 1;
+
+        for_each_online_pgdat(pgdat) {
+                struct page *page, *end;
+                unsigned long flags;
+
+                pgdat_resize_lock(pgdat, &flags);
+                page = pgdat->node_mem_map;
+                end = page + pgdat->node_spanned_pages;
+
+                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);
+
+                pgdat_resize_unlock(pgdat, &flags);
         }
-        printk("%d pages of RAM\n",total);
-        printk("%d reserved pages\n",reserved);
-        printk("%d pages shared\n",shared);
-        printk("%d pages swap cached\n",cached);
+
+        printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+        printk("%d pages of RAM\n", total);
+        printk("%d free pages\n", free);
+        printk("%d reserved pages\n", reserved);
+        printk("%d slab pages\n", slab);
+        printk("%d pages shared\n", shared);
+        printk("%d pages swap cached\n", cached);
 }
 
 #ifdef CONFIG_MMU
@@ -147,52 +144,38 @@ extern char __init_begin, __init_end;
  */
 void __init paging_init(void)
 {
-        unsigned long zones_size[MAX_NR_ZONES] = { 0, };
+        int nid;
 
-        /*
-         * Setup some defaults for the zone sizes.. these should be safe
-         * regardless of distcontiguous memory or MMU settings.
-         */
-        zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
-#ifdef CONFIG_HIGHMEM
-        zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT;
-#endif
-
-#ifdef CONFIG_MMU
-        /*
-         * If we have an MMU, and want to be using it .. we need to adjust
-         * the zone sizes accordingly, in addition to turning it on.
-         */
-        {
-                /* We don't need to map the kernel through the TLB, as
-                 * it is permanatly mapped using P1. So clear the
-                 * entire pgd. */
-                memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
-
-                /* Turn on the MMU */
-                enable_mmu();
-                zones_size[ZONE_NORMAL] = MAX_LOW_PFN - START_PFN;
-        }
+        /* We don't need to map the kernel through the TLB, as
+         * it is permanatly mapped using P1. So clear the
+         * entire pgd. */
+        memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
 
         /* Set an initial value for the MMU.TTB so we don't have to
          * check for a null value. */
         set_TTB(swapper_pg_dir);
 
-#elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4)
-        /*
-         * If we don't have CONFIG_MMU set and the processor in question
-         * still has an MMU, care needs to be taken to make sure it doesn't
-         * stay on.. Since the boot loader could have potentially already
-         * turned it on, and we clearly don't want it, we simply turn it off.
-         *
-         * We don't need to do anything special for the zone sizes, since the
-         * default values that were already configured up above should be
-         * satisfactory.
-         */
-        disable_mmu();
-#endif
-        NODE_DATA(0)->node_mem_map = NULL;
-        free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
+        for_each_online_node(nid) {
+                pg_data_t *pgdat = NODE_DATA(nid);
+                unsigned long max_zone_pfns[MAX_NR_ZONES];
+                unsigned long low, start_pfn;
+
+                memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+
+                start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT;
+                low = pgdat->bdata->node_low_pfn;
+
+                max_zone_pfns[ZONE_NORMAL] = low;
+                add_active_range(nid, start_pfn, low);
+
+                printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
+                       nid, start_pfn, low);
+
+                free_area_init_nodes(max_zone_pfns);
+
+                printk("Node %u: mem_map starts at %p\n",
+                       pgdat->node_id, pgdat->node_mem_map);
+        }
 }
 
 static struct kcore_list kcore_mem, kcore_vmalloc;
@@ -200,18 +183,33 @@ static struct kcore_list kcore_mem, kcore_vmalloc;
 void __init mem_init(void)
 {
         int codesize, reservedpages, datasize, initsize;
-        int tmp;
-        extern unsigned long memory_start;
+        int nid;
 
-#ifdef CONFIG_MMU
-        high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);
-#else
-        extern unsigned long memory_end;
+        reservedpages = 0;
 
-        high_memory = (void *)(memory_end & PAGE_MASK);
-#endif
+        for_each_online_node(nid) {
+                pg_data_t *pgdat = NODE_DATA(nid);
+                unsigned long node_pages = 0;
+                void *node_high_memory;
+                int i;
+
+                num_physpages += pgdat->node_present_pages;
+
+                if (pgdat->node_spanned_pages)
+                        node_pages = free_all_bootmem_node(pgdat);
+
+                totalram_pages += node_pages;
 
-        max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start);
+                for (i = 0; i < node_pages; i++)
+                        if (PageReserved(pgdat->node_mem_map + i))
+                                reservedpages++;
+
+                node_high_memory = (void *)((pgdat->node_start_pfn +
+                                             pgdat->node_spanned_pages) <<
+                                                PAGE_SHIFT);
+                if (node_high_memory > high_memory)
+                        high_memory = node_high_memory;
+        }
 
         /* clear the zero-page */
         memset(empty_zero_page, 0, PAGE_SIZE);
@@ -229,16 +227,6 @@ void __init mem_init(void)
         clear_page = clear_page_nommu;
 #endif
 
-        /* this will put all low memory onto the freelists */
-        totalram_pages += free_all_bootmem_node(NODE_DATA(0));
-        reservedpages = 0;
-        for (tmp = 0; tmp < num_physpages; tmp++)
-                /*
-                 * Only count reserved RAM pages
-                 */
-                if (PageReserved(mem_map+tmp))
-                        reservedpages++;
-
         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
@@ -250,7 +238,7 @@ void __init mem_init(void)
         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
                "%dk reserved, %dk data, %dk init)\n",
                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
-                max_mapnr << (PAGE_SHIFT-10),
+                totalram_pages << (PAGE_SHIFT-10),
                 codesize >> 10,
                 reservedpages << (PAGE_SHIFT-10),
                 datasize >> 10,
@@ -289,4 +277,3 @@ void free_initrd_mem(unsigned long start, unsigned long end)
         printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 }
 #endif
-