4 files changed, 93 insertions, 15 deletions

diff --git a/arch/ppc64/kernel/mpic.c b/arch/ppc64/kernel/mpic.c
index cc262a05ddb4..5f5bc73754d9 100644
--- a/arch/ppc64/kernel/mpic.c
+++ b/arch/ppc64/kernel/mpic.c
@@ -506,8 +506,8 @@ struct mpic * __init mpic_alloc(unsigned long phys_addr,
         mpic->senses_count = senses_count;
 
         /* Map the global registers */
-        mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000);
-        mpic->tmregs = mpic->gregs + (MPIC_TIMER_BASE >> 2);
+        mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x2000);
+        mpic->tmregs = mpic->gregs + ((MPIC_TIMER_BASE - MPIC_GREG_BASE) >> 2);
         BUG_ON(mpic->gregs == NULL);
 
         /* Reset */
diff --git a/arch/ppc64/kernel/vdso.c b/arch/ppc64/kernel/vdso.c
index efa985f05aca..4aacf521e3e4 100644
--- a/arch/ppc64/kernel/vdso.c
+++ b/arch/ppc64/kernel/vdso.c
@@ -176,13 +176,13 @@ static struct page * vdso_vma_nopage(struct vm_area_struct * vma,
                 return NOPAGE_SIGBUS;
 
         /*
-         * Last page is systemcfg, special handling here, no get_page() a
-         * this is a reserved page
+         * Last page is systemcfg.
          */
         if ((vma->vm_end - address) <= PAGE_SIZE)
-                return virt_to_page(systemcfg);
+                pg = virt_to_page(systemcfg);
+        else
+                pg = virt_to_page(vbase + offset);
 
-        pg = virt_to_page(vbase + offset);
         get_page(pg);
         DBG(" ->page count: %d\n", page_count(pg));
 
@@ -259,7 +259,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int executable_stack)
          * gettimeofday will be totally dead. It's fine to use that for setting
          * breakpoints in the vDSO code pages though
          */
-        vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC;
+        vma->vm_flags = VM_READ | VM_EXEC | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | VM_RESERVED;
         vma->vm_flags |= mm->def_flags;
         vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
         vma->vm_ops = &vdso_vmops;
@@ -603,6 +603,8 @@ void __init vdso_init(void)
                 ClearPageReserved(pg);
                 get_page(pg);
         }
+
+        get_page(virt_to_page(systemcfg));
 }
 
 int in_gate_area_no_task(unsigned long addr)
diff --git a/arch/ppc64/mm/imalloc.c b/arch/ppc64/mm/imalloc.c
index c65b87b92756..f4ca29cf5364 100644
--- a/arch/ppc64/mm/imalloc.c
+++ b/arch/ppc64/mm/imalloc.c
@@ -300,12 +300,7 @@ void im_free(void * addr)
         for (p = &imlist ; (tmp = *p) ; p = &tmp->next) {
                 if (tmp->addr == addr) {
                         *p = tmp->next;
-
-                        /* XXX: do we need the lock? */
-                        spin_lock(&init_mm.page_table_lock);
                         unmap_vm_area(tmp);
-                        spin_unlock(&init_mm.page_table_lock);
-
                         kfree(tmp);
                         up(&imlist_sem);
                         return;
diff --git a/arch/ppc64/mm/init.c b/arch/ppc64/mm/init.c
index be64b157afce..e2bd7776622f 100644
--- a/arch/ppc64/mm/init.c
+++ b/arch/ppc64/mm/init.c
@@ -104,6 +104,8 @@ void show_mem(void)
         show_free_areas();
         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
         for_each_pgdat(pgdat) {
+                unsigned long flags;
+                pgdat_resize_lock(pgdat, &flags);
                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
                         page = pgdat_page_nr(pgdat, i);
                         total++;
@@ -114,6 +116,7 @@ void show_mem(void)
                         else if (page_count(page))
                                 shared += page_count(page) - 1;
                 }
+                pgdat_resize_unlock(pgdat, &flags);
         }
         printk("%ld pages of RAM\n", total);
         printk("%ld reserved pages\n", reserved);
@@ -155,7 +158,6 @@ static int map_io_page(unsigned long ea, unsigned long pa, int flags)
         unsigned long vsid;
 
         if (mem_init_done) {
-                spin_lock(&init_mm.page_table_lock);
                 pgdp = pgd_offset_k(ea);
                 pudp = pud_alloc(&init_mm, pgdp, ea);
                 if (!pudp)
@@ -163,12 +165,11 @@ static int map_io_page(unsigned long ea, unsigned long pa, int flags)
                 pmdp = pmd_alloc(&init_mm, pudp, ea);
                 if (!pmdp)
                         return -ENOMEM;
-                ptep = pte_alloc_kernel(&init_mm, pmdp, ea);
+                ptep = pte_alloc_kernel(pmdp, ea);
                 if (!ptep)
                         return -ENOMEM;
                 set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
                                                           __pgprot(flags)));
-                spin_unlock(&init_mm.page_table_lock);
         } else {
                 unsigned long va, vpn, hash, hpteg;
 
@@ -649,11 +650,14 @@ void __init mem_init(void)
 #endif
 
         for_each_pgdat(pgdat) {
+                unsigned long flags;
+                pgdat_resize_lock(pgdat, &flags);
                 for (i = 0; i < pgdat->node_spanned_pages; i++) {
                         page = pgdat_page_nr(pgdat, i);
                         if (PageReserved(page))
                                 reservedpages++;
                 }
+                pgdat_resize_unlock(pgdat, &flags);
         }
 
         codesize = (unsigned long)&_etext - (unsigned long)&_stext;
@@ -867,3 +871,80 @@ pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
         return vma_prot;
 }
 EXPORT_SYMBOL(phys_mem_access_prot);
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+
+void online_page(struct page *page)
+{
+        ClearPageReserved(page);
+        free_cold_page(page);
+        totalram_pages++;
+        num_physpages++;
+}
+
+/*
+ * This works only for the non-NUMA case.  Later, we'll need a lookup
+ * to convert from real physical addresses to nid, that doesn't use
+ * pfn_to_nid().
+ */
+int __devinit add_memory(u64 start, u64 size)
+{
+        struct pglist_data *pgdata = NODE_DATA(0);
+        struct zone *zone;
+        unsigned long start_pfn = start >> PAGE_SHIFT;
+        unsigned long nr_pages = size >> PAGE_SHIFT;
+
+        /* this should work for most non-highmem platforms */
+        zone = pgdata->node_zones;
+
+        return __add_pages(zone, start_pfn, nr_pages);
+
+        return 0;
+}
+
+/*
+ * First pass at this code will check to determine if the remove
+ * request is within the RMO.  Do not allow removal within the RMO.
+ */
+int __devinit remove_memory(u64 start, u64 size)
+{
+        struct zone *zone;
+        unsigned long start_pfn, end_pfn, nr_pages;
+
+        start_pfn = start >> PAGE_SHIFT;
+        nr_pages = size >> PAGE_SHIFT;
+        end_pfn = start_pfn + nr_pages;
+
+        printk("%s(): Attempting to remove memoy in range "
+                        "%lx to %lx\n", __func__, start, start+size);
+        /*
+         * check for range within RMO
+         */
+        zone = page_zone(pfn_to_page(start_pfn));
+
+        printk("%s(): memory will be removed from "
+                        "the %s zone\n", __func__, zone->name);
+
+        /*
+         * not handling removing memory ranges that
+         * overlap multiple zones yet
+         */
+        if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages))
+                goto overlap;
+
+        /* make sure it is NOT in RMO */
+        if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) {
+                printk("%s(): range to be removed must NOT be in RMO!\n",
+                        __func__);
+                goto in_rmo;
+        }
+
+        return __remove_pages(zone, start_pfn, nr_pages);
+
+overlap:
+        printk("%s(): memory range to be removed overlaps "
+                "multiple zones!!!\n", __func__);
+in_rmo:
+        return -1;
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */