-----
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/arch/powerpc/mm/fault.c 2.6.25-rc8/arch/powerpc/mm/fault.c
--- /home/rossb/local/linux-2.6.25-rc8/arch/powerpc/mm/fault.c 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/arch/powerpc/mm/fault.c 2008-04-10 08:32:23.000000000 -0700
@@ -299,6 +299,8 @@ good_area:
if (get_pteptr(mm, address, &ptep, &pmdp)) {
spinlock_t *ptl = pte_lockptr(mm, pmdp);
spin_lock(ptl);
+ delimbo_pte(&ptep, &ptl, &pmdp, mm, address);
+
if (pte_present(*ptep)) {
struct page *page = pte_page(*ptep);

diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/arch/powerpc/mm/hugetlbpage.c 2.6.25-rc8/arch/powerpc/mm/hugetlbpage.c
--- /home/rossb/local/linux-2.6.25-rc8/arch/powerpc/mm/hugetlbpage.c 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/arch/powerpc/mm/hugetlbpage.c 2008-04-10 08:32:23.000000000 -0700
@@ -73,6 +73,7 @@ static int __hugepte_alloc(struct mm_str
return -ENOMEM;

spin_lock(&mm->page_table_lock);
+ delimbo_hpd(&hpdp, mm, address);
if (!hugepd_none(*hpdp))
kmem_cache_free(huge_pgtable_cache, new);
else
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/arch/ppc/mm/fault.c 2.6.25-rc8/arch/ppc/mm/fault.c
--- /home/rossb/local/linux-2.6.25-rc8/arch/ppc/mm/fault.c 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/arch/ppc/mm/fault.c 2008-04-10 08:32:23.000000000 -0700
@@ -219,6 +219,7 @@ good_area:
if (get_pteptr(mm, address, &ptep, &pmdp)) {
spinlock_t *ptl = pte_lockptr(mm, pmdp);
spin_lock(ptl);
+ delimbo_pte(&ptep, &ptl, &pmdp, mm, address);
if (pte_present(*ptep)) {
struct page *page = pte_page(*ptep);

diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/arch/x86/Kconfig 2.6.25-rc8/arch/x86/Kconfig
--- /home/rossb/local/linux-2.6.25-rc8/arch/x86/Kconfig 2008-04-10 08:08:58.000000000 -0700
+++ 2.6.25-rc8/arch/x86/Kconfig 2008-04-10 08:32:24.000000000 -0700
@@ -108,6 +108,10 @@ config GENERIC_TIME_VSYSCALL
bool
default X86_64

+config RELOCATE_PAGE_TABLES
+ bool
+ default x86_64
+
config ARCH_HAS_CPU_RELAX
def_bool y

diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/arch/x86/kernel/smp_64.c 2.6.25-rc8/arch/x86/kernel/smp_64.c
--- /home/rossb/local/linux-2.6.25-rc8/arch/x86/kernel/smp_64.c 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/arch/x86/kernel/smp_64.c 2008-04-10 08:32:31.000000000 -0700
@@ -155,6 +155,8 @@ asmlinkage void smp_invalidate_interrupt
if (read_pda(mmu_state) == TLBSTATE_OK) {
if (f->flush_va == TLB_FLUSH_ALL)
local_flush_tlb();
+ else if (f->flush_va == TLB_RELOAD_ALL)
+ local_reload_tlb_mm(f->flush_mm);
else
__flush_tlb_one(f->flush_va);
} else
@@ -228,10 +230,36 @@ void flush_tlb_current_task(void)
preempt_enable();
}

+void reload_tlb_mm(struct mm_struct *mm)
+{
+ cpumask_t cpu_mask;
+
+ clear_bit(MMF_NEED_RELOAD, &mm->flags);
+ clear_bit(MMF_NEED_FLUSH, &mm->flags);
+
+ preempt_disable();
+ cpu_mask = mm->cpu_vm_mask;
+ cpu_clear(smp_processor_id(), cpu_mask);
+
+ if (current->active_mm == mm) {
+ if (current->mm)
+ local_reload_tlb_mm(mm);
+ else
+ leave_mm(smp_processor_id());
+ }
+ if (!cpus_empty(cpu_mask))
+ flush_tlb_others(cpu_mask, mm, TLB_RELOAD_ALL);
+
+ preempt_enable();
+
+}
+
void flush_tlb_mm (struct mm_struct * mm)
{
cpumask_t cpu_mask;

+ clear_bit(MMF_NEED_FLUSH, &mm->flags);
+
preempt_disable();
cpu_mask = mm->cpu_vm_mask;
cpu_clear(smp_processor_id(), cpu_mask);
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/arch/x86/mm/hugetlbpage.c 2.6.25-rc8/arch/x86/mm/hugetlbpage.c
--- /home/rossb/local/linux-2.6.25-rc8/arch/x86/mm/hugetlbpage.c 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/arch/x86/mm/hugetlbpage.c 2008-04-10 08:32:31.000000000 -0700
@@ -88,6 +88,7 @@ static void huge_pmd_share(struct mm_str
goto out;

spin_lock(&mm->page_table_lock);
+ delimbo_pud(&pud, mm, addr);
if (pud_none(*pud))
pud_populate(mm, pud, (pmd_t *)((unsigned long)spte & PAGE_MASK));
else
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/include/asm-generic/pgalloc.h 2.6.25-rc8/include/asm-generic/pgalloc.h
--- /home/rossb/local/linux-2.6.25-rc8/include/asm-generic/pgalloc.h 1969-12-31 16:00:00.000000000 -0800
+++ 2.6.25-rc8/include/asm-generic/pgalloc.h 2008-04-10 08:32:36.000000000 -0700
@@ -0,0 +1,37 @@
+#ifndef _ASM_GENERIC_PGALLOC_H
+#define _ASM_GENERIC_PGALLOC_H
+
+
+
+/* Page Table Levels used for alloc_page_table. */
+#define PAGE_TABLE_PGD 0
+#define PAGE_TABLE_PUD 1
+#define PAGE_TABLE_PMD 2
+#define PAGE_TABLE_PTE 3
+
+static inline struct page *alloc_page_table_node(struct mm_struct *mm,
+ unsigned long addr,
+ int node,
+ int page_table_level)
+{
+ switch (page_table_level) {
+ case PAGE_TABLE_PGD:
+ return virt_to_page(pgd_alloc_node(mm, node));
+
+ case PAGE_TABLE_PUD:
+ return virt_to_page(pud_alloc_one_node(mm, addr, node));
+
+ case PAGE_TABLE_PMD:
+ return virt_to_page(pmd_alloc_one_node(mm, addr, node));
+
+ case PAGE_TABLE_PTE:
+ return pte_alloc_one_node(mm, addr, node);
+
+ default:
+ BUG();
+ return NULL;
+ }
+}
+
+
+#endif /* _ASM_GENERIC_PGALLOC_H */
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/include/asm-generic/pgtable.h 2.6.25-rc8/include/asm-generic/pgtable.h
--- /home/rossb/local/linux-2.6.25-rc8/include/asm-generic/pgtable.h 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/include/asm-generic/pgtable.h 2008-04-10 08:32:36.000000000 -0700
@@ -4,6 +4,8 @@
#ifndef __ASSEMBLY__
#ifdef CONFIG_MMU

+#include
+
#ifndef __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
/*
* Largely same as above, but only sets the access flags (dirty,
@@ -195,6 +197,48 @@ static inline int pmd_none_or_clear_bad(
}
return 0;
}
+
+
+/* Used to rewalk the page tables if after we grab the appropriate lock,
+ we end up with a page that's just waiting to go away. */
+static inline pgd_t *walk_page_table_pgd(struct mm_struct *mm,
+ unsigned long addr)
+{
+ return pgd_offset(mm, addr);
+}
+
+static inline pud_t *walk_page_table_pud(struct mm_struct *mm,
+ unsigned long addr) {
+ pgd_t *pgd;
+ pgd = walk_page_table_pgd(mm, addr);
+ BUG_ON(!pgd);
+ return pud_offset(pgd, addr);
+}
+
+static inline pmd_t *walk_page_table_pmd(struct mm_struct *mm,
+ unsigned long addr)
+{
+ pud_t *pud;
+ pud = walk_page_table_pud(mm, addr);
+ BUG_ON(!pud);
+ return pmd_offset(pud, addr);
+}
+
+static inline pte_t *walk_page_table_pte(struct mm_struct *mm,
+ unsigned long addr)
+{
+ pmd_t *pmd;
+ pmd = walk_page_table_pmd(mm, addr);
+ BUG_ON(!pmd);
+ return pte_offset_map(pmd, addr);
+}
+
+static inline pte_t *walk_page_table_huge_pte(struct mm_struct *mm,
+ unsigned long addr)
+{
+ return (pte_t *)walk_page_table_pmd(mm, addr);
+}
+
#endif /* CONFIG_MMU */

/*
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/include/asm-x86/pgalloc_64.h 2.6.25-rc8/include/asm-x86/pgalloc_64.h
--- /home/rossb/local/linux-2.6.25-rc8/include/asm-x86/pgalloc_64.h 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/include/asm-x86/pgalloc_64.h 2008-04-10 09:20:44.000000000 -0700
@@ -25,16 +25,6 @@ static inline void pmd_free(struct mm_st
free_page((unsigned long)pmd);
}

-static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
-{
- return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
-}
-
-static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
-{
- return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
-}
-
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
@@ -61,12 +51,75 @@ static inline void pgd_list_del(pgd_t *p
spin_unlock_irqrestore(&pgd_lock, flags);
}

-static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+{
+ BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
+ pgd_list_del(pgd);
+ free_page((unsigned long)pgd);
+}
+
+
+/* Should really implement gc for free page table pages. This could be
+ done with a reference count in struct page. */
+
+static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+{
+ BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
+ free_page((unsigned long)pte);
+}
+
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+{
+ pgtable_page_dtor(pte);
+ __free_page(pte);
+}
+
+#define __pte_free_tlb(tlb,pte) \
+do { \
+ pgtable_page_dtor((pte)); \
+ tlb_remove_page((tlb), (pte)); \
+} while (0)
+
+#define __pmd_free_tlb(tlb, x) tlb_remove_page((tlb), virt_to_page(x))
+#define __pud_free_tlb(tlb, x) tlb_remove_page((tlb), virt_to_page(x))
+
+#ifdef CONFIG_NUMA
+static inline pud_t *pud_alloc_one_node(struct mm_struct *mm,
+ unsigned long addr,
+ int node)
+{
+ struct page *page;
+
+ page = alloc_pages_node(node, GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+ if (page)
+ return (pud_t *)page_address(page);
+ return NULL;
+}
+
+static inline pmd_t *pmd_alloc_one_node(struct mm_struct *mm,
+ unsigned long addr,
+ int node)
+{
+ struct page *page;
+
+ page = alloc_pages_node(node, GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+ if (page)
+ return (pmd_t *)page_address(page);
+ return NULL;
+}
+
+static inline pgd_t *pgd_alloc_node(struct mm_struct *mm, int node)
{
unsigned boundary;
- pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
- if (!pgd)
+ struct page *page;
+ pgd_t *pgd;
+
+ page = alloc_pages_node(node, GFP_KERNEL|__GFP_REPEAT, 0);
+ if (!page)
return NULL;
+
+ pgd = (pgd_t *)page_address(page);
+
pgd_list_add(pgd);
/*
* Copy kernel pointers in from init.
@@ -81,11 +134,72 @@ static inline pgd_t *pgd_alloc(struct mm
return pgd;
}

-static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
+static inline pte_t *pte_alloc_one_kernel_node(struct mm_struct *mm,
+ unsigned long address,
+ int node)
{
- BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
- pgd_list_del(pgd);
- free_page((unsigned long)pgd);
+ struct page *page;
+
+ page = alloc_pages_node(node, GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+ if (page)
+ return (pte_t *)page_address(page);
+ return NULL;
+}
+
+static inline struct page *pte_alloc_one_node(struct mm_struct *mm,
+ unsigned long address,
+ int node)
+{
+ struct page *page;
+ page = alloc_pages_node(node, GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+ return page;
+}
+
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+ return pgd_alloc_node(mm, -1);
+}
+
+static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
+ unsigned long address)
+{
+ return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+}
+
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+ return pte_alloc_one_node(mm, addr, -1);
+}
+
+static inline pmd_t *pmd_alloc_one (struct mm_struct *mm, unsigned long addr)
+{
+ return pmd_alloc_one_node(mm, addr, -1);
+}
+
+static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+ return pud_alloc_one_node(mm, addr, -1);
+}
+
+#else /* !CONFIG_NUMA */
+static inline pgd_t *pgd_alloc(struct mm_struct *mm)
+{
+ unsigned boundary;
+ pgd_t *pgd = (pgd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
+ if (!pgd)
+ return NULL;
+ pgd_list_add(pgd);
+ /*
+ * Copy kernel pointers in from init.
+ * Could keep a freelist or slab cache of those because the kernel
+ * part never changes.
+ */
+ boundary = pgd_index(__PAGE_OFFSET);
+ memset(pgd, 0, boundary * sizeof(pgd_t));
+ memcpy(pgd + boundary,
+ init_level4_pgt + boundary,
+ (PTRS_PER_PGD - boundary) * sizeof(pgd_t));
+ return pgd;
}

static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
@@ -106,28 +220,19 @@ static inline pgtable_t pte_alloc_one(st
return page;
}

-/* Should really implement gc for free page table pages. This could be
- done with a reference count in struct page. */
-
-static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
+static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
- BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
- free_page((unsigned long)pte);
+ return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
}

-static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
+static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
- pgtable_page_dtor(pte);
- __free_page(pte);
+ return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
}

-#define __pte_free_tlb(tlb,pte) \
-do { \
- pgtable_page_dtor((pte)); \
- tlb_remove_page((tlb), (pte)); \
-} while (0)
+#endif
+
+#include

-#define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
-#define __pud_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))

#endif /* _X86_64_PGALLOC_H */
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/include/linux/migrate.h 2.6.25-rc8/include/linux/migrate.h
--- /home/rossb/local/linux-2.6.25-rc8/include/linux/migrate.h 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/include/linux/migrate.h 2008-04-10 08:32:36.000000000 -0700
@@ -6,6 +6,10 @@
#include

typedef struct page *new_page_t(struct page *, unsigned long private, int **);
+typedef struct page *new_page_table_t(struct mm_struct *,
+ unsigned long addr,
+ unsigned long private,
+ int **, int page_table_level);

#ifdef CONFIG_MIGRATION
/* Check if a vma is migratable */
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/include/linux/mm.h 2.6.25-rc8/include/linux/mm.h
--- /home/rossb/local/linux-2.6.25-rc8/include/linux/mm.h 2008-04-10 08:09:09.000000000 -0700
+++ 2.6.25-rc8/include/linux/mm.h 2008-04-10 09:17:30.000000000 -0700
@@ -12,6 +12,7 @@
#include
#include
#include
+#include

struct mempolicy;
struct anon_vma;
@@ -924,6 +925,7 @@ static inline void pgtable_page_dtor(str
pte_t *__pte = pte_offset_map(pmd, address); \
*(ptlp) = __ptl; \
spin_lock(__ptl); \
+ delimbo_pte(&__pte, ptlp, &pmd, mm, address); \
__pte; \
})

@@ -948,6 +950,99 @@ extern void free_area_init(unsigned long
extern void free_area_init_node(int nid, pg_data_t *pgdat,
unsigned long * zones_size, unsigned long zone_start_pfn,
unsigned long *zholes_size);
+
+#ifdef CONFIG_RELOCATE_PAGE_TABLES
+
+static inline void delimbo_pte(pte_t **pte, spinlock_t **ptl, pmd_t **pmd,
+ struct mm_struct *mm,
+ unsigned long addr)
+{
+ if (!test_bit(MMF_NEED_REWALK, &mm->flags))
+ return;
+
+#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+ spin_unlock(*ptl);
+ spin_lock(&mm->page_table_lock);
+#endif
+ pte_unmap(*pte);
+ *pmd = walk_page_table_pmd(mm, addr);
+ *pte = pte_offset_map(*pmd, addr);
+ *ptl = pte_lockptr(mm, *pmd);
+#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+ spin_lock(*ptl);
+ spin_unlock(&mm->page_table_lock);
+#endif
+}
+
+static inline void delimbo_pte_nested(pte_t **pte, spinlock_t **ptl,
+ pmd_t **pmd,
+ struct mm_struct *mm,
+ unsigned long addr, int subclass)
+{
+ if (!test_bit(MMF_NEED_REWALK, &mm->flags))
+ return;
+
+#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+ spin_unlock(*ptl);
+ spin_lock(&mm->page_table_lock);
+#endif
+ *pmd = walk_page_table_pmd(mm, addr);
+ *pte = pte_offset_map(*pmd, addr);
+ *ptl = pte_lockptr(mm, *pmd);
+
+#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
+ spin_lock_nested(*ptl, subclass);
+ spin_unlock(&mm->page_table_lock);
+#endif
+}
+
+static inline void delimbo_pud(pud_t **pud, struct mm_struct *mm,
+ unsigned long addr)
+{
+
+ if (!test_bit(MMF_NEED_REWALK, &mm->flags))
+ return;
+
+ *pud = walk_page_table_pud(mm, addr);
+}
+
+static inline void delimbo_pmd(pmd_t **pmd, struct mm_struct *mm,
+ unsigned long addr)
+{
+
+ if (!test_bit(MMF_NEED_REWALK, &mm->flags))
+ return;
+
+ *pmd = walk_page_table_pmd(mm, addr);
+}
+
+static inline void delimbo_pgd(pgd_t **pgd, struct mm_struct *mm,
+ unsigned long addr)
+{
+ if (!test_bit(MMF_NEED_REWALK, &mm->flags))
+ return;
+
+ *pgd = walk_page_table_pgd(mm, addr);
+}
+
+static inline void delimbo_huge_pte(pte_t **pte, struct mm_struct *mm,
+ unsigned long addr)
+{
+ if (!test_bit(MMF_NEED_REWALK, &mm->flags))
+ return;
+
+ *pte = walk_page_table_huge_pte(mm, addr);
+}
+
+#else /* CONFIG_RELOCATE_PAGE_TABLES */
+#define delimbo_pte(pte, ptl, pmd, mm, addr)
+#define delimbo_pte_nested(pte, ptl, pmd, mm, addr, subclass)
+#define delimbo_pud(pud, mm, addr)
+#define delimbo_pmd(pmd, mm, addr)
+#define delimbo_pgd(pgd, mm, addr)
+#define delimbo_huge_pte(pte, mm, addr)
+#endif /* CONFIG_RELOCATE_PAGE_TABLES */
+
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
/*
* With CONFIG_ARCH_POPULATES_NODE_MAP set, an architecture may initialise its
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/include/linux/mm_types.h 2.6.25-rc8/include/linux/mm_types.h
--- /home/rossb/local/linux-2.6.25-rc8/include/linux/mm_types.h 2008-04-10 08:09:09.000000000 -0700
+++ 2.6.25-rc8/include/linux/mm_types.h 2008-04-10 09:17:44.000000000 -0700
@@ -10,6 +10,9 @@
#include
#include
#include
+#include
+#include
+#include
#include
#include

@@ -74,9 +77,18 @@ struct page {
pgoff_t index; /* Our offset within mapping. */
void *freelist; /* SLUB: freelist req. slab lock */
};
+
+ union {
struct list_head lru; /* Pageout list, eg. active_list
* protected by zone->lru_lock !
*/
+ struct rcu_head rcu; /* Used by page table relocation code
+ * to remember page for later freeing,
+ * after we are sure anyone
+ * poking at the page tables is no
+ * longer looking at this page.
+ */
+ };
/*
* On machines where all RAM is mapped into kernel address space,
* we can simply calculate the virtual address. On machines with
@@ -182,6 +194,8 @@ struct mm_struct {
int map_count; /* number of VMAs */
int core_waiters;
struct rw_semaphore mmap_sem;
+ unsigned long flags; /* Must use atomic bitops to access the bits */
+
spinlock_t page_table_lock; /* Protects page tables and some counters */

struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
@@ -222,8 +236,6 @@ struct mm_struct {
unsigned int token_priority;
unsigned int last_interval;

- unsigned long flags; /* Must use atomic bitops to access the bits */
-
/* coredumping support */
struct completion *core_startup_done, core_done;

@@ -239,6 +251,11 @@ struct mm_struct {
struct file *exe_file;
unsigned long num_exe_file_vmas;
#endif
+
+#ifdef CONFIG_RELOCATE_PAGE_TABLES
+ /* Page table relocation support. */
+ struct semaphore page_table_relocation_lock;
+#endif /* CONFIG_RELOCATE_PAGE_TABLES */
};

#endif /* _LINUX_MM_TYPES_H */
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/kernel/fork.c 2.6.25-rc8/kernel/fork.c
--- /home/rossb/local/linux-2.6.25-rc8/kernel/fork.c 2008-04-10 08:09:10.000000000 -0700
+++ 2.6.25-rc8/kernel/fork.c 2008-04-10 08:32:36.000000000 -0700
@@ -360,6 +360,10 @@ static struct mm_struct * mm_init(struct
mm->cached_hole_size = ~0UL;
mm_init_cgroup(mm, p);

+#ifdef CONFIG_RELOCATE_PAGE_TABLES
+ init_MUTEX(&mm->page_table_relocation_lock);
+#endif
+
if (likely(!mm_alloc_pgd(mm))) {
mm->def_flags = 0;
return mm;
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/mm/hugetlb.c 2.6.25-rc8/mm/hugetlb.c
--- /home/rossb/local/linux-2.6.25-rc8/mm/hugetlb.c 2008-04-10 08:09:10.000000000 -0700
+++ 2.6.25-rc8/mm/hugetlb.c 2008-04-10 08:33:43.000000000 -0700
@@ -784,6 +784,8 @@ int copy_hugetlb_page_range(struct mm_st

spin_lock(&dst->page_table_lock);
spin_lock(&src->page_table_lock);
+ delimbo_huge_pte(&src_pte, src, addr);
+ delimbo_huge_pte(&dst_pte, dst, addr);
if (!huge_pte_none(huge_ptep_get(src_pte))) {
if (cow)
huge_ptep_set_wrprotect(src, addr, src_pte);
@@ -960,6 +962,7 @@ retry:
}

spin_lock(&mm->page_table_lock);
+ delimbo_huge_pte(&ptep, mm, address);
size = i_size_read(mapping->host) >> HPAGE_SHIFT;
if (idx >= size)
goto backout;
@@ -1017,6 +1020,7 @@ int hugetlb_fault(struct mm_struct *mm,
ret = 0;

spin_lock(&mm->page_table_lock);
+ delimbo_huge_pte(&ptep, mm, address);
/* Check for a racing update before calling hugetlb_cow */
if (likely(pte_same(entry, huge_ptep_get(ptep))))
if (write_access && !pte_write(entry))
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/mm/memory.c 2.6.25-rc8/mm/memory.c
--- /home/rossb/local/linux-2.6.25-rc8/mm/memory.c 2008-04-10 08:09:10.000000000 -0700
+++ 2.6.25-rc8/mm/memory.c 2008-04-10 08:32:36.000000000 -0700
@@ -312,6 +312,7 @@ int __pte_alloc(struct mm_struct *mm, pm
return -ENOMEM;

spin_lock(&mm->page_table_lock);
+ delimbo_pmd(&pmd, mm, address);
if (!pmd_present(*pmd)) { /* Has another populated it ? */
mm->nr_ptes++;
pmd_populate(mm, pmd, new);
@@ -330,6 +331,7 @@ int __pte_alloc_kernel(pmd_t *pmd, unsig
return -ENOMEM;

spin_lock(&init_mm.page_table_lock);
+ delimbo_pmd(&pmd, &init_mm, address);
if (!pmd_present(*pmd)) { /* Has another populated it ? */
pmd_populate_kernel(&init_mm, pmd, new);
new = NULL;
@@ -549,6 +551,8 @@ again:
src_pte = pte_offset_map_nested(src_pmd, addr);
src_ptl = pte_lockptr(src_mm, src_pmd);
spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
+
+ delimbo_pte(&src_pte, &src_ptl, &src_pmd, src_mm, addr);
arch_enter_lazy_mmu_mode();

do {
@@ -1566,13 +1570,15 @@ EXPORT_SYMBOL_GPL(apply_to_page_range);
* and do_anonymous_page and do_no_page can safely check later on).
*/
static inline int pte_unmap_same(struct mm_struct *mm, pmd_t *pmd,
- pte_t *page_table, pte_t orig_pte)
+ pte_t *page_table, pte_t orig_pte,
+ unsigned long address)
{
int same = 1;
#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
if (sizeof(pte_t) > sizeof(unsigned long)) {
spinlock_t *ptl = pte_lockptr(mm, pmd);
spin_lock(ptl);
+ delimbo_pte(&page_table, &ptl, &pmd, mm, address);
same = pte_same(*page_table, orig_pte);
spin_unlock(ptl);
}
@@ -2099,7 +2105,7 @@ static int do_swap_page(struct mm_struct
pte_t pte;
int ret = 0;

- if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
+ if (!pte_unmap_same(mm, pmd, page_table, orig_pte, address))
goto out;

entry = pte_to_swp_entry(orig_pte);
@@ -2178,6 +2184,10 @@ static int do_swap_page(struct mm_struct
}

/* No need to invalidate - it was non-present before */
+ /* Unless of course the cpu might be looking at an old
+ copy of the pte. */
+ maybe_reload_tlb_mm(mm);
+
update_mmu_cache(vma, address, pte);
unlock:
pte_unmap_unlock(page_table, ptl);
@@ -2229,6 +2239,10 @@ static int do_anonymous_page(struct mm_s
set_pte_at(mm, address, page_table, entry);

/* No need to invalidate - it was non-present before */
+ /* Unless of course the cpu might be looking at an old
+ copy of the pte. */
+ maybe_reload_tlb_mm(mm);
+
update_mmu_cache(vma, address, entry);
unlock:
pte_unmap_unlock(page_table, ptl);
@@ -2379,6 +2393,10 @@ static int __do_fault(struct mm_struct *
}

/* no need to invalidate: a not-present page won't be cached */
+ /* Unless of course the cpu could be looking at an old page
+ table entry. */
+ maybe_reload_tlb_mm(mm);
+
update_mmu_cache(vma, address, entry);
} else {
mem_cgroup_uncharge_page(page);
@@ -2488,7 +2506,7 @@ static int do_nonlinear_fault(struct mm_
(write_access ? FAULT_FLAG_WRITE : 0);
pgoff_t pgoff;

- if (!pte_unmap_same(mm, pmd, page_table, orig_pte))
+ if (!pte_unmap_same(mm, pmd, page_table, orig_pte, address))
return 0;

if (unlikely(!(vma->vm_flags & VM_NONLINEAR) ||
@@ -2547,6 +2565,7 @@ static inline int handle_pte_fault(struc

ptl = pte_lockptr(mm, pmd);
spin_lock(ptl);
+ delimbo_pte(&pte, &ptl, &pmd, mm, address);
if (unlikely(!pte_same(*pte, entry)))
goto unlock;
if (write_access) {
@@ -2568,6 +2587,12 @@ static inline int handle_pte_fault(struc
if (write_access)
flush_tlb_page(vma, address);
}
+
+ /* if the cpu could be looking at an old page table, we need to
+ flush out everything. */
+ maybe_reload_tlb_mm(mm);
+
+
unlock:
pte_unmap_unlock(pte, ptl);
return 0;
@@ -2617,6 +2642,7 @@ int __pud_alloc(struct mm_struct *mm, pg
return -ENOMEM;

spin_lock(&mm->page_table_lock);
+ delimbo_pgd(&pgd, mm, address);
if (pgd_present(*pgd)) /* Another has populated it */
pud_free(mm, new);
else
@@ -2638,6 +2664,7 @@ int __pmd_alloc(struct mm_struct *mm, pu
return -ENOMEM;

spin_lock(&mm->page_table_lock);
+ delimbo_pud(&pud, mm, address);
#ifndef __ARCH_HAS_4LEVEL_HACK
if (pud_present(*pud)) /* Another has populated it */
pmd_free(mm, new);
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/mm/mempolicy.c 2.6.25-rc8/mm/mempolicy.c
--- /home/rossb/local/linux-2.6.25-rc8/mm/mempolicy.c 2008-04-10 08:09:10.000000000 -0700
+++ 2.6.25-rc8/mm/mempolicy.c 2008-04-10 09:18:32.000000000 -0700
@@ -100,6 +100,12 @@
static struct kmem_cache *policy_cache;
static struct kmem_cache *sn_cache;

+#ifdef CONFIG_RELOCATE_PAGE_TABLES
+int migrate_page_tables_mm(struct mm_struct *mm, int source,
+ new_page_table_t get_new_page,
+ unsigned long private);
+#endif
+
/* Highest zone. An specific allocation for a zone below that is not
policied. */
enum zone_type policy_zone = 0;
@@ -730,6 +736,20 @@ static struct page *new_node_page(struct
return alloc_pages_node(node, GFP_HIGHUSER_MOVABLE, 0);
}

+#ifdef CONFIG_RELOCATE_PAGE_TABLES
+static struct page *new_node_page_page_tables(struct mm_struct *mm,
+ unsigned long addr,
+ unsigned long node,
+ int **x,
+ int level)
+{
+ struct page *p;
+ p = alloc_page_table_node(mm, addr, node, level);
+ return p;
+}
+
+#endif /* CONFIG_RELOCATE_PAGE_TABLES */
+
/*
* Migrate pages from one node to a target node.
* Returns error or the number of pages not migrated.
@@ -750,6 +770,12 @@ static int migrate_to_node(struct mm_str
if (!list_empty(&pagelist))
err = migrate_pages(&pagelist, new_node_page, dest);

+#ifdef CONFIG_RELOCATE_PAGE_TABLES
+ if (!err)
+ err = migrate_page_tables_mm(mm, source,
+ new_node_page_page_tables, dest);
+#endif /* CONFIG_RELOCATE_PAGE_TABLES */
+
return err;
}

diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/mm/migrate.c 2.6.25-rc8/mm/migrate.c
--- /home/rossb/local/linux-2.6.25-rc8/mm/migrate.c 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/mm/migrate.c 2008-04-10 09:58:44.000000000 -0700
@@ -30,9 +30,18 @@
#include
#include
#include
+#include
+#include
+#include
+#include

#include "internal.h"

+int migrate_page_tables_mm(struct mm_struct *mm, int source,
+ new_page_table_t get_new_page,
+ unsigned long private);
+
+
#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))

/*
@@ -155,6 +164,7 @@ static void remove_migration_pte(struct

ptl = pte_lockptr(mm, pmd);
spin_lock(ptl);
+ delimbo_pte(&ptep, &ptl, &pmd, mm, addr);
pte = *ptep;
if (!is_swap_pte(pte))
goto out;
@@ -895,9 +905,10 @@ set_status:
err = migrate_pages(&pagelist, new_page_node,
(unsigned long)pm);
else
- err = -ENOENT;
+ err = 0;

up_read(&mm->mmap_sem);
+
return err;
}

@@ -1075,3 +1086,344 @@ int migrate_vmas(struct mm_struct *mm, c
}
return err;
}
+
+#ifdef CONFIG_RELOCATE_PAGE_TABLES
+static void rcu_free_pt(struct rcu_head *head)
+{
+ /* Need to know that the mm has been flushed before
+ * we get here. Otherwise we need a way to find
+ * the appropriate mm to flush.
+ */
+ struct page *page = container_of(head, struct page, rcu);
+ INIT_LIST_HEAD(&page->lru);
+ __free_page(page);
+}
+
+int migrate_pgd(pgd_t *pgd, struct mm_struct *mm,
+ unsigned long addr, struct page *dest,
+ struct list_head *old_pages)
+{
+ unsigned long flags;
+ void *dest_ptr;
+ pud_t *pud;
+
+ spin_lock_irqsave(&mm->page_table_lock, flags);
+
+ delimbo_pgd(&pgd, mm, addr);
+
+ pud = pud_offset(pgd, addr);
+ dest_ptr = page_address(dest);
+ memcpy(dest_ptr, pud, PAGE_SIZE);
+
+ list_add_tail(&(pgd_page(*pgd)->lru), old_pages);
+ pgd_populate(mm, pgd, dest_ptr);
+
+ maybe_need_flush_mm(mm);
+
+ spin_unlock_irqrestore(&mm->page_table_lock, flags);
+
+ return 0;
+
+}
+
+int migrate_pud(pud_t *pud, struct mm_struct *mm, unsigned long addr,
+ struct page *dest, struct list_head *old_pages)
+{
+ unsigned long flags;
+ void *dest_ptr;
+ pmd_t *pmd;
+
+ spin_lock_irqsave(&mm->page_table_lock, flags);
+
+ delimbo_pud(&pud, mm, addr);
+ pmd = pmd_offset(pud, addr);
+
+ dest_ptr = page_address(dest);
+ memcpy(dest_ptr, pmd, PAGE_SIZE);
+
+ list_add_tail(&(pud_page(*pud)->lru), old_pages);
+
+ pud_populate(mm, pud, dest_ptr);
+ maybe_need_flush_mm(mm);
+
+ spin_unlock_irqrestore(&mm->page_table_lock, flags);
+
+ return 0;
+}
+
+
+int migrate_pmd(pmd_t *pmd, struct mm_struct *mm, unsigned long addr,
+ struct page *dest, struct list_head *old_pages)
+{
+ unsigned long flags;
+ void *dest_ptr;
+ spinlock_t *ptl;
+ pte_t *pte;
+
+ spin_lock_irqsave(&mm->page_table_lock, flags);
+
+ delimbo_pmd(&pmd, mm, addr);
+
+ /* this could happen if the page table has been swapped out and we
+ were looking at the old one. */
+ if (unlikely(!pmd_present(*pmd))) {
+ spin_unlock_irqrestore(&mm->page_table_lock, flags);
+ return 1;
+ }
+
+ ptl = pte_lockptr(mm, pmd);
+
+ /* We need the page lock as well. */
+ if (ptl != &mm->page_table_lock)
+ spin_lock(ptl);
+
+ pte = pte_offset_map(pmd, addr);
+
+ dest_ptr = kmap_atomic(dest, KM_USER0);
+ memcpy(dest_ptr, pte, PAGE_SIZE);
+ list_add_tail(&(pmd_page(*pmd)->lru), old_pages);
+
+ kunmap_atomic(dest, KM_USER0);
+ pte_unmap(pte);
+ pte_lock_init(dest);
+ pmd_populate(mm, pmd, dest);
+
+ maybe_need_flush_mm(mm);
+
+ if (ptl != &mm->page_table_lock)
+ spin_unlock(ptl);
+
+ spin_unlock_irqrestore(&mm->page_table_lock, flags);
+
+ return 0;
+}
+
+static int migrate_page_tables_pmd(pmd_t *pmd, struct mm_struct *mm,
+ unsigned long *address, int source,
+ new_page_table_t get_new_page,
+ unsigned long private,
+ struct list_head *old_pages)
+{
+ int pages_not_migrated = 0;
+ int *result = NULL;
+ struct page *old_page = virt_to_page(pmd);
+ struct page *new_page;
+ int not_migrated;
+
+ if (!pmd_present(*pmd)) {
+ *address += (unsigned long)PTRS_PER_PTE * PAGE_SIZE;
+ return 0;
+ }
+
+ if (page_to_nid(old_page) == source) {
+ new_page = get_new_page(mm, *address, private, &result,
+ PAGE_TABLE_PTE);
+ if (!new_page)
+ return -ENOMEM;
+ not_migrated = migrate_pmd(pmd, mm, *address, new_page,
+ old_pages);
+ if (not_migrated)
+ __free_page(new_page);
+
+ pages_not_migrated += not_migrated;
+ }
+
+
+ *address += (unsigned long)PTRS_PER_PTE * PAGE_SIZE;
+
+ return pages_not_migrated;
+}
+
+static int migrate_page_tables_pud(pud_t *pud, struct mm_struct *mm,
+ unsigned long *address, int source,
+ new_page_table_t get_new_page,
+ unsigned long private,
+ struct list_head *old_pages)
+{
+ int pages_not_migrated = 0;
+ int i;
+ int *result = NULL;
+ struct page *old_page = virt_to_page(pud);
+ struct page *new_page;
+ int not_migrated;
+
+ if (!pud_present(*pud)) {
+ *address += (unsigned long)PTRS_PER_PMD *
+ (unsigned long)PTRS_PER_PTE * PAGE_SIZE;
+ return 0;
+ }
+
+ if (page_to_nid(old_page) == source) {
+ new_page = get_new_page(mm, *address, private, &result,
+ PAGE_TABLE_PMD);
+ if (!new_page)
+ return -ENOMEM;
+
+ not_migrated = migrate_pud(pud, mm, *address, new_page,
+ old_pages);
+
+ if (not_migrated)
+ __free_page(new_page);
+
+ pages_not_migrated += not_migrated;
+ }
+
+ for (i = 0; i < PTRS_PER_PUD; i++) {
+ int ret;
+ ret = migrate_page_tables_pmd(pmd_offset(pud, *address), mm,
+ address, source,
+ get_new_page, private,
+ old_pages);
+ if (ret < 0)
+ return ret;
+ pages_not_migrated += ret;
+ }
+
+ return pages_not_migrated;
+}
+
+static int migrate_page_tables_pgd(pgd_t *pgd, struct mm_struct *mm,
+ unsigned long *address, int source,
+ new_page_table_t get_new_page,
+ unsigned long private,
+ struct list_head *old_pages)
+{
+ int pages_not_migrated = 0;
+ int i;
+ int *result = NULL;
+ struct page *old_page = virt_to_page(pgd);
+ struct page *new_page;
+ int not_migrated;
+
+ if (!pgd_present(*pgd)) {
+ *address += (unsigned long)PTRS_PER_PUD *
+ (unsigned long)PTRS_PER_PMD *
+ (unsigned long)PTRS_PER_PTE * PAGE_SIZE;
+ return 0;
+ }
+
+ if (page_to_nid(old_page) == source) {
+ new_page = get_new_page(mm, *address, private, &result,
+ PAGE_TABLE_PUD);
+ if (!new_page)
+ return -ENOMEM;
+
+ not_migrated = migrate_pgd(pgd, mm, *address, new_page,
+ old_pages);
+ if (not_migrated)
+ __free_page(new_page);
+
+ pages_not_migrated += not_migrated;
+
+ }
+
+ for (i = 0; i < PTRS_PER_PUD; i++) {
+ int ret;
+ ret = migrate_page_tables_pud(pud_offset(pgd, *address), mm,
+ address, source,
+ get_new_page, private,
+ old_pages);
+ if (ret < 0)
+ return ret;
+ pages_not_migrated += ret;
+ }
+
+ return pages_not_migrated;
+}
+
+static int enter_page_table_relocation_mode(struct mm_struct *mm)
+{
+ if (down_interruptible(&mm->page_table_relocation_lock))
+ return -EINTER;
+ set_bit(MMF_NEED_REWALK, &mm->flags);
+ return 0;
+}
+
+static void leave_page_table_relocation_mode(struct mm_struct *mm)
+{
+ synchronize_rcu();
+ clear_bit(MMF_NEED_REWALK, &mm->flags);
+ up(&mm->page_table_relocation_lock);
+}
+
+/* similiar to migrate pages, but migrates the page tables. */
+int migrate_page_tables_mm(struct mm_struct *mm, int source,
+ new_page_table_t get_new_page,
+ unsigned long private)
+{
+ int pages_not_migrated = 0;
+ int i;
+ int *result = NULL;
+ struct page *old_page = virt_to_page(mm->pgd);
+ struct page *new_page;
+ unsigned long address = 0UL;
+ int not_migrated;
+ int ret = 0;
+ LIST_HEAD(old_pages);
+
+ if (mm->pgd == NULL)
+ return 0;
+
+ ret = enter_page_table_relocation_mode(mm);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < PTRS_PER_PGD && address < mm->task_size; i++) {
+ ret = migrate_page_tables_pgd(pgd_offset(mm, address), mm,
+ &address, source,
+ get_new_page, private,
+ &old_pages);
+ if (ret < 0)
+ goto out_exit;
+
+ pages_not_migrated += ret;
+ }
+
+ if (page_to_nid(old_page) == source) {
+ new_page = get_new_page(mm, address, private, &result,
+ PAGE_TABLE_PGD);
+ if (!new_page) {
+ ret = -ENOMEM;
+ goto out_exit;
+ }
+
+ not_migrated = migrate_top_level_page_table(mm, new_page,
+ &old_pages);
+ if (not_migrated) {
+ pgd_list_del(page_address(new_page));
+ __free_page(new_page);
+ }
+
+ pages_not_migrated += not_migrated;
+ }
+
+ /* reload or flush the tlbs if necessary. */
+ maybe_reload_tlb_mm(mm);
+
+ /* Add the pages freed up to the rcu list to be freed later.
+ * We need to do this after we flush the mm to prevent
+ * a possible race where the page is freed while one of
+ * the cpus is still looking at it.
+ */
+
+ while (!list_empty(&old_pages)) {
+ old_page = list_first_entry(&old_pages, struct page, lru);
+ list_del(&old_page->lru);
+ /* This is the same memory as the list
+ * head we are using to maintain the list.
+ * so we have to make sure the list_del
+ * comes first.
+ */
+ INIT_RCU_HEAD(&old_page->rcu);
+ call_rcu(&old_page->rcu, rcu_free_pt);
+ }
+
+ out_exit:
+ leave_page_table_relocation_mode(mm);
+
+ if (ret < 0)
+ return ret;
+ return pages_not_migrated;
+}
+
+#endif /* CONFIG_RELOCATE_PAGE_TABLES */
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/mm/mremap.c 2.6.25-rc8/mm/mremap.c
--- /home/rossb/local/linux-2.6.25-rc8/mm/mremap.c 2008-04-01 12:44:26.000000000 -0700
+++ 2.6.25-rc8/mm/mremap.c 2008-04-10 08:32:36.000000000 -0700
@@ -98,6 +98,7 @@ static void move_ptes(struct vm_area_str
new_ptl = pte_lockptr(mm, new_pmd);
if (new_ptl != old_ptl)
spin_lock_nested(new_ptl, SINGLE_DEPTH_NESTING);
+ delimbo_pte(&new_pte, &new_ptl, &new_pmd, mm, new_addr);
arch_enter_lazy_mmu_mode();

for (; old_addr < old_end; old_pte++, old_addr += PAGE_SIZE,
diff -uprwNBb -X 2.6.25-rc8/Documentation/dontdiff /home/rossb/local/linux-2.6.25-rc8/mm/rmap.c 2.6.25-rc8/mm/rmap.c
--- /home/rossb/local/linux-2.6.25-rc8/mm/rmap.c 2008-04-10 08:09:10.000000000 -0700
+++ 2.6.25-rc8/mm/rmap.c 2008-04-10 08:32:36.000000000 -0700
@@ -255,6 +255,7 @@ pte_t *page_check_address(struct page *p

ptl = pte_lockptr(mm, pmd);
spin_lock(ptl);
+ delimbo_pte(&pte, &ptl, &pmd, mm, address);
if (pte_present(*pte) && page_to_pfn(page) == pte_pfn(*pte)) {
*ptlp = ptl;
return pte;
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