Merge branch 'linus' into perfcounters/core

Conflicts:
	arch/x86/kernel/irqinit.c
	arch/x86/kernel/irqinit_64.c
	arch/x86/kernel/traps.c
	arch/x86/mm/fault.c
	include/linux/sched.h
	kernel/exit.c

13 files changed, 190 insertions, 330 deletions

diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index e7277cbcfb40..a725b7f760ae 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -161,13 +161,14 @@ static void note_page(struct seq_file *m, struct pg_state *st,
                    st->current_address >= st->marker[1].start_address) {
                 const char *unit = units;
                 unsigned long delta;
+                int width = sizeof(unsigned long) * 2;
 
                 /*
                  * Now print the actual finished series
                  */
-                seq_printf(m, "0x%p-0x%p   ",
-                           (void *)st->start_address,
-                           (void *)st->current_address);
+                seq_printf(m, "0x%0*lx-0x%0*lx   ",
+                           width, st->start_address,
+                           width, st->current_address);
 
                 delta = (st->current_address - st->start_address) >> 10;
                 while (!(delta & 1023) && unit[1]) {
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 5c6d816f30b4..c6acc6326374 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -3,41 +3,17 @@
  *  Copyright (C) 2001, 2002 Andi Kleen, SuSE Labs.
  *  Copyright (C) 2008-2009, Red Hat Inc., Ingo Molnar
  */
-#include <linux/interrupt.h>
-#include <linux/mmiotrace.h>
-#include <linux/bootmem.h>
-#include <linux/compiler.h>
-#include <linux/highmem.h>
-#include <linux/kprobes.h>
-#include <linux/uaccess.h>
-#include <linux/vmalloc.h>
-#include <linux/vt_kern.h>
-#include <linux/signal.h>
-#include <linux/kernel.h>
-#include <linux/ptrace.h>
-#include <linux/string.h>
-#include <linux/module.h>
-#include <linux/kdebug.h>
-#include <linux/errno.h>
-#include <linux/magic.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-#include <linux/init.h>
-#include <linux/mman.h>
-#include <linux/tty.h>
-#include <linux/smp.h>
-#include <linux/mm.h>
-#include <linux/perf_counter.h>
-
-#include <asm-generic/sections.h>
-
-#include <asm/tlbflush.h>
-#include <asm/pgalloc.h>
-#include <asm/segment.h>
-#include <asm/system.h>
-#include <asm/proto.h>
-#include <asm/traps.h>
-#include <asm/desc.h>
+#include <linux/magic.h>                /* STACK_END_MAGIC              */
+#include <linux/sched.h>                /* test_thread_flag(), ...      */
+#include <linux/kdebug.h>               /* oops_begin/end, ...          */
+#include <linux/module.h>               /* search_exception_table       */
+#include <linux/bootmem.h>              /* max_low_pfn                  */
+#include <linux/kprobes.h>              /* __kprobes, ...               */
+#include <linux/mmiotrace.h>            /* kmmio_handler, ...           */
+#include <linux/perf_counter.h>         /* perf_swcounter_event         */
+
+#include <asm/traps.h>                  /* dotraplinkage, ...           */
+#include <asm/pgalloc.h>                /* pgd_*(), ...                 */
 
 /*
  * Page fault error code bits:
@@ -226,12 +202,10 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
         if (!pmd_present(*pmd_k))
                 return NULL;
 
-        if (!pmd_present(*pmd)) {
+        if (!pmd_present(*pmd))
                 set_pmd(pmd, *pmd_k);
-                arch_flush_lazy_mmu_mode();
-        } else {
+        else
                 BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k));
-        }
 
         return pmd_k;
 }
@@ -539,8 +513,6 @@ bad:
 static int is_errata93(struct pt_regs *regs, unsigned long address)
 {
 #ifdef CONFIG_X86_64
-        static int once;
-
         if (address != regs->ip)
                 return 0;
 
@@ -550,10 +522,7 @@ static int is_errata93(struct pt_regs *regs, unsigned long address)
         address |= 0xffffffffUL << 32;
         if ((address >= (u64)_stext && address <= (u64)_etext) ||
             (address >= MODULES_VADDR && address <= MODULES_END)) {
-                if (!once) {
-                        printk(errata93_warning);
-                        once = 1;
-                }
+                printk_once(errata93_warning);
                 regs->ip = address;
                 return 1;
         }
diff --git a/arch/x86/mm/highmem_32.c b/arch/x86/mm/highmem_32.c
index 8126e8d1a2a4..58f621e81919 100644
--- a/arch/x86/mm/highmem_32.c
+++ b/arch/x86/mm/highmem_32.c
@@ -44,7 +44,6 @@ void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot)
         vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
         BUG_ON(!pte_none(*(kmap_pte-idx)));
         set_pte(kmap_pte-idx, mk_pte(page, prot));
-        arch_flush_lazy_mmu_mode();
 
         return (void *)vaddr;
 }
@@ -74,7 +73,6 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
 #endif
         }
 
-        arch_flush_lazy_mmu_mode();
         pagefault_enable();
 }
 
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index ae4f7b5d7104..34c1bfb64f1c 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -1,3 +1,4 @@
+#include <linux/initrd.h>
 #include <linux/ioport.h>
 #include <linux/swap.h>
 
@@ -10,6 +11,9 @@
 #include <asm/setup.h>
 #include <asm/system.h>
 #include <asm/tlbflush.h>
+#include <asm/tlb.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 
 unsigned long __initdata e820_table_start;
 unsigned long __meminitdata e820_table_end;
@@ -23,6 +27,69 @@ int direct_gbpages
 #endif
 ;
 
+int nx_enabled;
+
+#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
+static int disable_nx __cpuinitdata;
+
+/*
+ * noexec = on|off
+ *
+ * Control non-executable mappings for processes.
+ *
+ * on      Enable
+ * off     Disable
+ */
+static int __init noexec_setup(char *str)
+{
+        if (!str)
+                return -EINVAL;
+        if (!strncmp(str, "on", 2)) {
+                __supported_pte_mask |= _PAGE_NX;
+                disable_nx = 0;
+        } else if (!strncmp(str, "off", 3)) {
+                disable_nx = 1;
+                __supported_pte_mask &= ~_PAGE_NX;
+        }
+        return 0;
+}
+early_param("noexec", noexec_setup);
+#endif
+
+#ifdef CONFIG_X86_PAE
+static void __init set_nx(void)
+{
+        unsigned int v[4], l, h;
+
+        if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) {
+                cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]);
+
+                if ((v[3] & (1 << 20)) && !disable_nx) {
+                        rdmsr(MSR_EFER, l, h);
+                        l |= EFER_NX;
+                        wrmsr(MSR_EFER, l, h);
+                        nx_enabled = 1;
+                        __supported_pte_mask |= _PAGE_NX;
+                }
+        }
+}
+#else
+static inline void set_nx(void)
+{
+}
+#endif
+
+#ifdef CONFIG_X86_64
+void __cpuinit check_efer(void)
+{
+        unsigned long efer;
+
+        rdmsrl(MSR_EFER, efer);
+        if (!(efer & EFER_NX) || disable_nx)
+                __supported_pte_mask &= ~_PAGE_NX;
+}
+#endif
+
 static void __init find_early_table_space(unsigned long end, int use_pse,
                                           int use_gbpages)
 {
@@ -66,12 +133,11 @@ static void __init find_early_table_space(unsigned long end, int use_pse,
          */
 #ifdef CONFIG_X86_32
         start = 0x7000;
-        e820_table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
-                                        tables, PAGE_SIZE);
-#else /* CONFIG_X86_64 */
+#else
         start = 0x8000;
-        e820_table_start = find_e820_area(start, end, tables, PAGE_SIZE);
 #endif
+        e820_table_start = find_e820_area(start, max_pfn_mapped<<PAGE_SHIFT,
+                                        tables, PAGE_SIZE);
         if (e820_table_start == -1UL)
                 panic("Cannot find space for the kernel page tables");
 
@@ -159,12 +225,9 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
         use_gbpages = direct_gbpages;
 #endif
 
-#ifdef CONFIG_X86_32
-#ifdef CONFIG_X86_PAE
         set_nx();
         if (nx_enabled)
                 printk(KERN_INFO "NX (Execute Disable) protection: active\n");
-#endif
 
         /* Enable PSE if available */
         if (cpu_has_pse)
@@ -175,7 +238,6 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
                 set_in_cr4(X86_CR4_PGE);
                 __supported_pte_mask |= _PAGE_GLOBAL;
         }
-#endif
 
         if (use_gbpages)
                 page_size_mask |= 1 << PG_LEVEL_1G;
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 749559ed80f5..949708d7a481 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -49,12 +49,9 @@
 #include <asm/paravirt.h>
 #include <asm/setup.h>
 #include <asm/cacheflush.h>
+#include <asm/page_types.h>
 #include <asm/init.h>
 
-unsigned long max_low_pfn_mapped;
-unsigned long max_pfn_mapped;
-
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 unsigned long highstart_pfn, highend_pfn;
 
 static noinline int do_test_wp_bit(void);
@@ -587,61 +584,9 @@ void zap_low_mappings(void)
         flush_tlb_all();
 }
 
-int nx_enabled;
-
 pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP);
 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 
-#ifdef CONFIG_X86_PAE
-
-static int disable_nx __initdata;
-
-/*
- * noexec = on|off
- *
- * Control non executable mappings.
- *
- * on      Enable
- * off     Disable
- */
-static int __init noexec_setup(char *str)
-{
-        if (!str || !strcmp(str, "on")) {
-                if (cpu_has_nx) {
-                        __supported_pte_mask |= _PAGE_NX;
-                        disable_nx = 0;
-                }
-        } else {
-                if (!strcmp(str, "off")) {
-                        disable_nx = 1;
-                        __supported_pte_mask &= ~_PAGE_NX;
-                } else {
-                        return -EINVAL;
-                }
-        }
-
-        return 0;
-}
-early_param("noexec", noexec_setup);
-
-void __init set_nx(void)
-{
-        unsigned int v[4], l, h;
-
-        if (cpu_has_pae && (cpuid_eax(0x80000000) > 0x80000001)) {
-                cpuid(0x80000001, &v[0], &v[1], &v[2], &v[3]);
-
-                if ((v[3] & (1 << 20)) && !disable_nx) {
-                        rdmsr(MSR_EFER, l, h);
-                        l |= EFER_NX;
-                        wrmsr(MSR_EFER, l, h);
-                        nx_enabled = 1;
-                        __supported_pte_mask |= _PAGE_NX;
-                }
-        }
-}
-#endif
-
 /* user-defined highmem size */
 static unsigned int highmem_pages = -1;
 
@@ -761,15 +706,15 @@ void __init initmem_init(unsigned long start_pfn,
         highstart_pfn = highend_pfn = max_pfn;
         if (max_pfn > max_low_pfn)
                 highstart_pfn = max_low_pfn;
-        memory_present(0, 0, highend_pfn);
         e820_register_active_regions(0, 0, highend_pfn);
+        sparse_memory_present_with_active_regions(0);
         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
                 pages_to_mb(highend_pfn - highstart_pfn));
         num_physpages = highend_pfn;
         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 #else
-        memory_present(0, 0, max_low_pfn);
         e820_register_active_regions(0, 0, max_low_pfn);
+        sparse_memory_present_with_active_regions(0);
         num_physpages = max_low_pfn;
         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
 #endif
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 1753e8020df6..52bb9519bb86 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -50,18 +50,8 @@
 #include <asm/cacheflush.h>
 #include <asm/init.h>
 
-/*
- * end_pfn only includes RAM, while max_pfn_mapped includes all e820 entries.
- * The direct mapping extends to max_pfn_mapped, so that we can directly access
- * apertures, ACPI and other tables without having to play with fixmaps.
- */
-unsigned long max_low_pfn_mapped;
-unsigned long max_pfn_mapped;
-
 static unsigned long dma_reserve __initdata;
 
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-
 static int __init parse_direct_gbpages_off(char *arg)
 {
         direct_gbpages = 0;
@@ -85,39 +75,6 @@ early_param("gbpages", parse_direct_gbpages_on);
 pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
 EXPORT_SYMBOL_GPL(__supported_pte_mask);
 
-static int disable_nx __cpuinitdata;
-
-/*
- * noexec=on|off
- * Control non-executable mappings for 64-bit processes.
- *
- * on   Enable (default)
- * off  Disable
- */
-static int __init nonx_setup(char *str)
-{
-        if (!str)
-                return -EINVAL;
-        if (!strncmp(str, "on", 2)) {
-                __supported_pte_mask |= _PAGE_NX;
-                disable_nx = 0;
-        } else if (!strncmp(str, "off", 3)) {
-                disable_nx = 1;
-                __supported_pte_mask &= ~_PAGE_NX;
-        }
-        return 0;
-}
-early_param("noexec", nonx_setup);
-
-void __cpuinit check_efer(void)
-{
-        unsigned long efer;
-
-        rdmsrl(MSR_EFER, efer);
-        if (!(efer & EFER_NX) || disable_nx)
-                __supported_pte_mask &= ~_PAGE_NX;
-}
-
 int force_personality32;
 
 /*
@@ -628,6 +585,7 @@ void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn)
         early_res_to_bootmem(0, end_pfn<<PAGE_SHIFT);
         reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);
 }
+#endif
 
 void __init paging_init(void)
 {
@@ -638,11 +596,10 @@ void __init paging_init(void)
         max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
         max_zone_pfns[ZONE_NORMAL] = max_pfn;
 
-        memory_present(0, 0, max_pfn);
+        sparse_memory_present_with_active_regions(MAX_NUMNODES);
         sparse_init();
         free_area_init_nodes(max_zone_pfns);
 }
-#endif
 
 /*
  * Memory hotplug specific functions
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index 8056545e2d39..fe6f84ca121e 100644
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -82,7 +82,6 @@ iounmap_atomic(void *kvaddr, enum km_type type)
         if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx))
                 kpte_clear_flush(kmap_pte-idx, vaddr);
 
-        arch_flush_lazy_mmu_mode();
         pagefault_enable();
 }
 EXPORT_SYMBOL_GPL(iounmap_atomic);
diff --git a/arch/x86/mm/kmmio.c b/arch/x86/mm/kmmio.c
index 50dc802a1c46..16ccbd77917f 100644
--- a/arch/x86/mm/kmmio.c
+++ b/arch/x86/mm/kmmio.c
@@ -32,7 +32,7 @@ struct kmmio_fault_page {
         struct list_head list;
         struct kmmio_fault_page *release_next;
         unsigned long page; /* location of the fault page */
-        bool old_presence; /* page presence prior to arming */
+        pteval_t old_presence; /* page presence prior to arming */
         bool armed;
 
         /*
@@ -97,60 +97,62 @@ static struct kmmio_probe *get_kmmio_probe(unsigned long addr)
 static struct kmmio_fault_page *get_kmmio_fault_page(unsigned long page)
 {
         struct list_head *head;
-        struct kmmio_fault_page *p;
+        struct kmmio_fault_page *f;
 
         page &= PAGE_MASK;
         head = kmmio_page_list(page);
-        list_for_each_entry_rcu(p, head, list) {
-                if (p->page == page)
-                        return p;
+        list_for_each_entry_rcu(f, head, list) {
+                if (f->page == page)
+                        return f;
         }
         return NULL;
 }
 
-static void set_pmd_presence(pmd_t *pmd, bool present, bool *old)
+static void clear_pmd_presence(pmd_t *pmd, bool clear, pmdval_t *old)
 {
         pmdval_t v = pmd_val(*pmd);
-        *old = !!(v & _PAGE_PRESENT);
-        v &= ~_PAGE_PRESENT;
-        if (present)
-                v |= _PAGE_PRESENT;
+        if (clear) {
+                *old = v & _PAGE_PRESENT;
+                v &= ~_PAGE_PRESENT;
+        } else  /* presume this has been called with clear==true previously */
+                v |= *old;
         set_pmd(pmd, __pmd(v));
 }
 
-static void set_pte_presence(pte_t *pte, bool present, bool *old)
+static void clear_pte_presence(pte_t *pte, bool clear, pteval_t *old)
 {
         pteval_t v = pte_val(*pte);
-        *old = !!(v & _PAGE_PRESENT);
-        v &= ~_PAGE_PRESENT;
-        if (present)
-                v |= _PAGE_PRESENT;
+        if (clear) {
+                *old = v & _PAGE_PRESENT;
+                v &= ~_PAGE_PRESENT;
+        } else  /* presume this has been called with clear==true previously */
+                v |= *old;
         set_pte_atomic(pte, __pte(v));
 }
 
-static int set_page_presence(unsigned long addr, bool present, bool *old)
+static int clear_page_presence(struct kmmio_fault_page *f, bool clear)
 {
         unsigned int level;
-        pte_t *pte = lookup_address(addr, &level);
+        pte_t *pte = lookup_address(f->page, &level);
 
         if (!pte) {
-                pr_err("kmmio: no pte for page 0x%08lx\n", addr);
+                pr_err("kmmio: no pte for page 0x%08lx\n", f->page);
                 return -1;
         }
 
         switch (level) {
         case PG_LEVEL_2M:
-                set_pmd_presence((pmd_t *)pte, present, old);
+                clear_pmd_presence((pmd_t *)pte, clear, &f->old_presence);
                 break;
         case PG_LEVEL_4K:
-                set_pte_presence(pte, present, old);
+                clear_pte_presence(pte, clear, &f->old_presence);
                 break;
         default:
                 pr_err("kmmio: unexpected page level 0x%x.\n", level);
                 return -1;
         }
 
-        __flush_tlb_one(addr);
+        __flush_tlb_one(f->page);
         return 0;
 }
 
@@ -171,9 +173,9 @@ static int arm_kmmio_fault_page(struct kmmio_fault_page *f)
         WARN_ONCE(f->armed, KERN_ERR "kmmio page already armed.\n");
         if (f->armed) {
                 pr_warning("kmmio double-arm: page 0x%08lx, ref %d, old %d\n",
-                                        f->page, f->count, f->old_presence);
+                                        f->page, f->count, !!f->old_presence);
         }
-        ret = set_page_presence(f->page, false, &f->old_presence);
+        ret = clear_page_presence(f, true);
         WARN_ONCE(ret < 0, KERN_ERR "kmmio arming 0x%08lx failed.\n", f->page);
         f->armed = true;
         return ret;
@@ -182,8 +184,7 @@ static int arm_kmmio_fault_page(struct kmmio_fault_page *f)
 /** Restore the given page to saved presence state. */
 static void disarm_kmmio_fault_page(struct kmmio_fault_page *f)
 {
-        bool tmp;
-        int ret = set_page_presence(f->page, f->old_presence, &tmp);
+        int ret = clear_page_presence(f, false);
         WARN_ONCE(ret < 0,
                         KERN_ERR "kmmio disarming 0x%08lx failed.\n", f->page);
         f->armed = false;
@@ -310,7 +311,12 @@ static int post_kmmio_handler(unsigned long condition, struct pt_regs *regs)
         struct kmmio_context *ctx = &get_cpu_var(kmmio_ctx);
 
         if (!ctx->active) {
-                pr_debug("kmmio: spurious debug trap on CPU %d.\n",
+                /*
+                 * debug traps without an active context are due to either
+                 * something external causing them (f.e. using a debugger while
+                 * mmio tracing enabled), or erroneous behaviour
+                 */
+                pr_warning("kmmio: unexpected debug trap on CPU %d.\n",
                                                         smp_processor_id());
                 goto out;
         }
@@ -439,12 +445,12 @@ static void rcu_free_kmmio_fault_pages(struct rcu_head *head)
                                                 head,
                                                 struct kmmio_delayed_release,
                                                 rcu);
-        struct kmmio_fault_page *p = dr->release_list;
-        while (p) {
-                struct kmmio_fault_page *next = p->release_next;
-                BUG_ON(p->count);
-                kfree(p);
-                p = next;
+        struct kmmio_fault_page *f = dr->release_list;
+        while (f) {
+                struct kmmio_fault_page *next = f->release_next;
+                BUG_ON(f->count);
+                kfree(f);
+                f = next;
         }
         kfree(dr);
 }
@@ -453,19 +459,19 @@ static void remove_kmmio_fault_pages(struct rcu_head *head)
 {
         struct kmmio_delayed_release *dr =
                 container_of(head, struct kmmio_delayed_release, rcu);
-        struct kmmio_fault_page *p = dr->release_list;
+        struct kmmio_fault_page *f = dr->release_list;
         struct kmmio_fault_page **prevp = &dr->release_list;
         unsigned long flags;
 
         spin_lock_irqsave(&kmmio_lock, flags);
-        while (p) {
-                if (!p->count) {
-                        list_del_rcu(&p->list);
-                        prevp = &p->release_next;
+        while (f) {
+                if (!f->count) {
+                        list_del_rcu(&f->list);
+                        prevp = &f->release_next;
                 } else {
-                        *prevp = p->release_next;
+                        *prevp = f->release_next;
                 }
-                p = p->release_next;
+                f = f->release_next;
         }
         spin_unlock_irqrestore(&kmmio_lock, flags);
 
@@ -528,8 +534,8 @@ void unregister_kmmio_probe(struct kmmio_probe *p)
 }
 EXPORT_SYMBOL(unregister_kmmio_probe);
 
-static int kmmio_die_notifier(struct notifier_block *nb, unsigned long val,
-                                                                void *args)
+static int
+kmmio_die_notifier(struct notifier_block *nb, unsigned long val, void *args)
 {
         struct die_args *arg = args;
 
@@ -544,11 +550,23 @@ static struct notifier_block nb_die = {
         .notifier_call = kmmio_die_notifier
 };
 
-static int __init init_kmmio(void)
+int kmmio_init(void)
 {
         int i;
+
         for (i = 0; i < KMMIO_PAGE_TABLE_SIZE; i++)
                 INIT_LIST_HEAD(&kmmio_page_table[i]);
+
         return register_die_notifier(&nb_die);
 }
-fs_initcall(init_kmmio); /* should be before device_initcall() */
+
+void kmmio_cleanup(void)
+{
+        int i;
+
+        unregister_die_notifier(&nb_die);
+        for (i = 0; i < KMMIO_PAGE_TABLE_SIZE; i++) {
+                WARN_ONCE(!list_empty(&kmmio_page_table[i]),
+                        KERN_ERR "kmmio_page_table not empty at cleanup, any further tracing will leak memory.\n");
+        }
+}
diff --git a/arch/x86/mm/memtest.c b/arch/x86/mm/memtest.c
index 605c8be06217..c0bedcd10f97 100644
--- a/arch/x86/mm/memtest.c
+++ b/arch/x86/mm/memtest.c
@@ -40,23 +40,23 @@ static void __init reserve_bad_mem(u64 pattern, u64 start_bad, u64 end_bad)
 
 static void __init memtest(u64 pattern, u64 start_phys, u64 size)
 {
-        u64 i, count;
-        u64 *start;
+        u64 *p;
+        void *start, *end;
         u64 start_bad, last_bad;
         u64 start_phys_aligned;
         size_t incr;
 
         incr = sizeof(pattern);
         start_phys_aligned = ALIGN(start_phys, incr);
-        count = (size - (start_phys_aligned - start_phys))/incr;
         start = __va(start_phys_aligned);
+        end = start + size - (start_phys_aligned - start_phys);
         start_bad = 0;
         last_bad = 0;
 
-        for (i = 0; i < count; i++)
-                start[i] = pattern;
-        for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
-                if (*start == pattern)
+        for (p = start; p < end; p++)
+                *p = pattern;
+        for (p = start; p < end; p++, start_phys_aligned += incr) {
+                if (*p == pattern)
                         continue;
                 if (start_phys_aligned == last_bad + incr) {
                         last_bad += incr;
diff --git a/arch/x86/mm/mmio-mod.c b/arch/x86/mm/mmio-mod.c
index c9342ed8b402..132772a8ec57 100644
--- a/arch/x86/mm/mmio-mod.c
+++ b/arch/x86/mm/mmio-mod.c
@@ -451,6 +451,7 @@ void enable_mmiotrace(void)
 
         if (nommiotrace)
                 pr_info(NAME "MMIO tracing disabled.\n");
+        kmmio_init();
         enter_uniprocessor();
         spin_lock_irq(&trace_lock);
         atomic_inc(&mmiotrace_enabled);
@@ -473,6 +474,7 @@ void disable_mmiotrace(void)
 
         clear_trace_list(); /* guarantees: no more kmmio callbacks */
         leave_uniprocessor();
+        kmmio_cleanup();
         pr_info(NAME "disabled.\n");
 out:
         mutex_unlock(&mmiotrace_mutex);
diff --git a/arch/x86/mm/numa_64.c b/arch/x86/mm/numa_64.c
index 2d05a12029dc..459913beac71 100644
--- a/arch/x86/mm/numa_64.c
+++ b/arch/x86/mm/numa_64.c
@@ -179,18 +179,25 @@ static void * __init early_node_mem(int nodeid, unsigned long start,
 }
 
 /* Initialize bootmem allocator for a node */
-void __init setup_node_bootmem(int nodeid, unsigned long start,
-                               unsigned long end)
+void __init
+setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
 {
         unsigned long start_pfn, last_pfn, bootmap_pages, bootmap_size;
+        const int pgdat_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
         unsigned long bootmap_start, nodedata_phys;
         void *bootmap;
-        const int pgdat_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
         int nid;
 
         if (!end)
                 return;
 
+        /*
+         * Don't confuse VM with a node that doesn't have the
+         * minimum amount of memory:
+         */
+        if (end && (end - start) < NODE_MIN_SIZE)
+                return;
+
         start = roundup(start, ZONE_ALIGN);
 
         printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid,
@@ -272,9 +279,6 @@ void __init setup_node_bootmem(int nodeid, unsigned long start,
                 reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start,
                                  bootmap_pages<<PAGE_SHIFT, BOOTMEM_DEFAULT);
 
-#ifdef CONFIG_ACPI_NUMA
-        srat_reserve_add_area(nodeid);
-#endif
         node_set_online(nodeid);
 }
 
@@ -578,21 +582,6 @@ unsigned long __init numa_free_all_bootmem(void)
         return pages;
 }
 
-void __init paging_init(void)
-{
-        unsigned long max_zone_pfns[MAX_NR_ZONES];
-
-        memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-        max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
-        max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
-        max_zone_pfns[ZONE_NORMAL] = max_pfn;
-
-        sparse_memory_present_with_active_regions(MAX_NUMNODES);
-        sparse_init();
-
-        free_area_init_nodes(max_zone_pfns);
-}
-
 static __init int numa_setup(char *opt)
 {
         if (!opt)
@@ -606,8 +595,6 @@ static __init int numa_setup(char *opt)
 #ifdef CONFIG_ACPI_NUMA
         if (!strncmp(opt, "noacpi", 6))
                 acpi_numa = -1;
-        if (!strncmp(opt, "hotadd=", 7))
-                hotadd_percent = simple_strtoul(opt+7, NULL, 10);
 #endif
         return 0;
 }
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index e17efed088c5..6ce9518fe2ac 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -839,13 +839,6 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
 
         vm_unmap_aliases();
 
-        /*
-         * If we're called with lazy mmu updates enabled, the
-         * in-memory pte state may be stale.  Flush pending updates to
-         * bring them up to date.
-         */
-        arch_flush_lazy_mmu_mode();
-
         cpa.vaddr = addr;
         cpa.pages = pages;
         cpa.numpages = numpages;
@@ -890,13 +883,6 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
         } else
                 cpa_flush_all(cache);
 
-        /*
-         * If we've been called with lazy mmu updates enabled, then
-         * make sure that everything gets flushed out before we
-         * return.
-         */
-        arch_flush_lazy_mmu_mode();
-
 out:
         return ret;
 }
diff --git a/arch/x86/mm/srat_64.c b/arch/x86/mm/srat_64.c
index 01765955baaf..2dfcbf9df2ae 100644
--- a/arch/x86/mm/srat_64.c
+++ b/arch/x86/mm/srat_64.c
@@ -31,17 +31,11 @@ static nodemask_t nodes_parsed __initdata;
 static nodemask_t cpu_nodes_parsed __initdata;
 static struct bootnode nodes[MAX_NUMNODES] __initdata;
 static struct bootnode nodes_add[MAX_NUMNODES];
-static int found_add_area __initdata;
-int hotadd_percent __initdata = 0;
 
 static int num_node_memblks __initdata;
 static struct bootnode node_memblk_range[NR_NODE_MEMBLKS] __initdata;
 static int memblk_nodeid[NR_NODE_MEMBLKS] __initdata;
 
-/* Too small nodes confuse the VM badly. Usually they result
-   from BIOS bugs. */
-#define NODE_MIN_SIZE (4*1024*1024)
-
 static __init int setup_node(int pxm)
 {
         return acpi_map_pxm_to_node(pxm);
@@ -66,9 +60,6 @@ static __init void cutoff_node(int i, unsigned long start, unsigned long end)
 {
         struct bootnode *nd = &nodes[i];
 
-        if (found_add_area)
-                return;
-
         if (nd->start < start) {
                 nd->start = start;
                 if (nd->end < nd->start)
@@ -86,7 +77,6 @@ static __init void bad_srat(void)
         int i;
         printk(KERN_ERR "SRAT: SRAT not used.\n");
         acpi_numa = -1;
-        found_add_area = 0;
         for (i = 0; i < MAX_LOCAL_APIC; i++)
                 apicid_to_node[i] = NUMA_NO_NODE;
         for (i = 0; i < MAX_NUMNODES; i++)
@@ -182,24 +172,21 @@ acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
                pxm, apic_id, node);
 }
 
-static int update_end_of_memory(unsigned long end) {return -1;}
-static int hotadd_enough_memory(struct bootnode *nd) {return 1;}
 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 static inline int save_add_info(void) {return 1;}
 #else
 static inline int save_add_info(void) {return 0;}
 #endif
 /*
- * Update nodes_add and decide if to include add are in the zone.
- * Both SPARSE and RESERVE need nodes_add information.
- * This code supports one contiguous hot add area per node.
+ * Update nodes_add[]
+ * This code supports one contiguous hot add area per node
  */
-static int __init
-reserve_hotadd(int node, unsigned long start, unsigned long end)
+static void __init
+update_nodes_add(int node, unsigned long start, unsigned long end)
 {
         unsigned long s_pfn = start >> PAGE_SHIFT;
         unsigned long e_pfn = end >> PAGE_SHIFT;
-        int ret = 0, changed = 0;
+        int changed = 0;
         struct bootnode *nd = &nodes_add[node];
 
         /* I had some trouble with strange memory hotadd regions breaking
@@ -210,7 +197,7 @@ reserve_hotadd(int node, unsigned long start, unsigned long end)
            mistakes */
         if ((signed long)(end - start) < NODE_MIN_SIZE) {
                 printk(KERN_ERR "SRAT: Hotplug area too small\n");
-                return -1;
+                return;
         }
 
         /* This check might be a bit too strict, but I'm keeping it for now. */
@@ -218,12 +205,7 @@ reserve_hotadd(int node, unsigned long start, unsigned long end)
                 printk(KERN_ERR
                         "SRAT: Hotplug area %lu -> %lu has existing memory\n",
                         s_pfn, e_pfn);
-                return -1;
-        }
-
-        if (!hotadd_enough_memory(&nodes_add[node]))  {
-                printk(KERN_ERR "SRAT: Hotplug area too large\n");
-                return -1;
+                return;
         }
 
         /* Looks good */
@@ -245,11 +227,9 @@ reserve_hotadd(int node, unsigned long start, unsigned long end)
                         printk(KERN_ERR "SRAT: Hotplug zone not continuous. Partly ignored\n");
         }
 
-        ret = update_end_of_memory(nd->end);
-
         if (changed)
-                printk(KERN_INFO "SRAT: hot plug zone found %Lx - %Lx\n", nd->start, nd->end);
-        return ret;
+                printk(KERN_INFO "SRAT: hot plug zone found %Lx - %Lx\n",
+                                 nd->start, nd->end);
 }
 
 /* Callback for parsing of the Proximity Domain <-> Memory Area mappings */
@@ -310,13 +290,10 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
                start, end);
         e820_register_active_regions(node, start >> PAGE_SHIFT,
                                      end >> PAGE_SHIFT);
-        push_node_boundaries(node, nd->start >> PAGE_SHIFT,
-                                                nd->end >> PAGE_SHIFT);
 
-        if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) &&
-            (reserve_hotadd(node, start, end) < 0)) {
-                /* Ignore hotadd region. Undo damage */
-                printk(KERN_NOTICE "SRAT: Hotplug region ignored\n");
+        if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) {
+                update_nodes_add(node, start, end);
+                /* restore nodes[node] */
                 *nd = oldnode;
                 if ((nd->start | nd->end) == 0)
                         node_clear(node, nodes_parsed);
@@ -345,9 +322,9 @@ static int __init nodes_cover_memory(const struct bootnode *nodes)
                         pxmram = 0;
         }
 
-        e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
-        /* We seem to lose 3 pages somewhere. Allow a bit of slack. */
-        if ((long)(e820ram - pxmram) >= 1*1024*1024) {
+        e820ram = max_pfn - (e820_hole_size(0, max_pfn<<PAGE_SHIFT)>>PAGE_SHIFT);
+        /* We seem to lose 3 pages somewhere. Allow 1M of slack. */
+        if ((long)(e820ram - pxmram) >= (1<<(20 - PAGE_SHIFT))) {
                 printk(KERN_ERR
         "SRAT: PXMs only cover %luMB of your %luMB e820 RAM. Not used.\n",
                         (pxmram << PAGE_SHIFT) >> 20,
@@ -357,17 +334,6 @@ static int __init nodes_cover_memory(const struct bootnode *nodes)
         return 1;
 }
 
-static void __init unparse_node(int node)
-{
-        int i;
-        node_clear(node, nodes_parsed);
-        node_clear(node, cpu_nodes_parsed);
-        for (i = 0; i < MAX_LOCAL_APIC; i++) {
-                if (apicid_to_node[i] == node)
-                        apicid_to_node[i] = NUMA_NO_NODE;
-        }
-}
-
 void __init acpi_numa_arch_fixup(void) {}
 
 /* Use the information discovered above to actually set up the nodes. */
@@ -379,18 +345,8 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
                 return -1;
 
         /* First clean up the node list */
-        for (i = 0; i < MAX_NUMNODES; i++) {
+        for (i = 0; i < MAX_NUMNODES; i++)
                 cutoff_node(i, start, end);
-                /*
-                 * don't confuse VM with a node that doesn't have the
-                 * minimum memory.
-                 */
-                if (nodes[i].end &&
-                        (nodes[i].end - nodes[i].start) < NODE_MIN_SIZE) {
-                        unparse_node(i);
-                        node_set_offline(i);
-                }
-        }
 
         if (!nodes_cover_memory(nodes)) {
                 bad_srat();
@@ -423,7 +379,7 @@ int __init acpi_scan_nodes(unsigned long start, unsigned long end)
 
                 if (node == NUMA_NO_NODE)
                         continue;
-                if (!node_isset(node, node_possible_map))
+                if (!node_online(node))
                         numa_clear_node(i);
         }
         numa_init_array();
@@ -510,26 +466,6 @@ static int null_slit_node_compare(int a, int b)
 }
 #endif /* CONFIG_NUMA_EMU */
 
-void __init srat_reserve_add_area(int nodeid)
-{
-        if (found_add_area && nodes_add[nodeid].end) {
-                u64 total_mb;
-
-                printk(KERN_INFO "SRAT: Reserving hot-add memory space "
-                                "for node %d at %Lx-%Lx\n",
-                        nodeid, nodes_add[nodeid].start, nodes_add[nodeid].end);
-                total_mb = (nodes_add[nodeid].end - nodes_add[nodeid].start)
-                                        >> PAGE_SHIFT;
-                total_mb *= sizeof(struct page);
-                total_mb >>= 20;
-                printk(KERN_INFO "SRAT: This will cost you %Lu MB of "
-                                "pre-allocated memory.\n", (unsigned long long)total_mb);
-                reserve_bootmem_node(NODE_DATA(nodeid), nodes_add[nodeid].start,
-                               nodes_add[nodeid].end - nodes_add[nodeid].start,
-                               BOOTMEM_DEFAULT);
-        }
-}
-
 int __node_distance(int a, int b)
 {
         int index;