powerpc/mm/thp: Abstraction for THP functions

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

6 files changed, 226 insertions, 179 deletions

diff --git a/arch/powerpc/include/asm/book3s/64/hash-64k.h b/arch/powerpc/include/asm/book3s/64/hash-64k.h
index 80d2abe25280..5aae4f530c21 100644
--- a/arch/powerpc/include/asm/book3s/64/hash-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/hash-64k.h
@@ -119,11 +119,6 @@ static inline int hash__remap_4k_pfn(struct vm_area_struct *vma, unsigned long a
 #define H_PGD_TABLE_SIZE        (sizeof(pgd_t) << PGD_INDEX_SIZE)
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-extern unsigned long pmd_hugepage_update(struct mm_struct *mm,
-                                         unsigned long addr,
-                                         pmd_t *pmdp,
-                                         unsigned long clr,
-                                         unsigned long set);
 static inline char *get_hpte_slot_array(pmd_t *pmdp)
 {
         /*
@@ -193,6 +188,24 @@ static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
         return (((pmd_raw(pmd_a) ^ pmd_raw(pmd_b)) & ~cpu_to_be64(_PAGE_HPTEFLAGS)) == 0);
 }
 
+static inline pmd_t hash__pmd_mkhuge(pmd_t pmd)
+{
+        return __pmd(pmd_val(pmd) | (_PAGE_PTE | H_PAGE_THP_HUGE));
+}
+
+extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm,
+                                           unsigned long addr, pmd_t *pmdp,
+                                           unsigned long clr, unsigned long set);
+extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma,
+                                   unsigned long address, pmd_t *pmdp);
+extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
+                                         pgtable_t pgtable);
+extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
+extern void hash__pmdp_huge_split_prepare(struct vm_area_struct *vma,
+                                      unsigned long address, pmd_t *pmdp);
+extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
+                                       unsigned long addr, pmd_t *pmdp);
+extern int hash__has_transparent_hugepage(void);
 #endif /*  CONFIG_TRANSPARENT_HUGEPAGE */
 #endif  /* __ASSEMBLY__ */
 
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable-64k.h b/arch/powerpc/include/asm/book3s/64/pgtable-64k.h
index 27b5e34abe24..79331cf77613 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable-64k.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable-64k.h
@@ -54,41 +54,6 @@ static inline int hugepd_ok(hugepd_t hpd)
 #endif /* CONFIG_HUGETLB_PAGE */
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
-static inline int pmd_large(pmd_t pmd)
-{
-        return !!(pmd_val(pmd) & _PAGE_PTE);
-}
-
-static inline pmd_t pmd_mknotpresent(pmd_t pmd)
-{
-        return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT);
-}
-/*
- * For radix we should always find H_PAGE_HASHPTE zero. Hence
- * the below will work for radix too
- */
-static inline int __pmdp_test_and_clear_young(struct mm_struct *mm,
-                                              unsigned long addr, pmd_t *pmdp)
-{
-        unsigned long old;
-
-        if ((pmd_val(*pmdp) & (_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0)
-                return 0;
-        old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0);
-        return ((old & _PAGE_ACCESSED) != 0);
-}
-
-#define __HAVE_ARCH_PMDP_SET_WRPROTECT
-static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr,
-                                      pmd_t *pmdp)
-{
-
-        if ((pmd_val(*pmdp) & _PAGE_WRITE) == 0)
-                return;
-
-        pmd_hugepage_update(mm, addr, pmdp, _PAGE_WRITE, 0);
-}
-
 static inline int pmd_trans_huge(pmd_t pmd)
 {
         if (radix_enabled())
@@ -103,6 +68,12 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
                 return radix__pmd_same(pmd_a, pmd_b);
         return hash__pmd_same(pmd_a, pmd_b);
 }
+
+static inline pmd_t pmd_mkhuge(pmd_t pmd)
+{
+        return hash__pmd_mkhuge(pmd);
+}
+
 #endif /*  CONFIG_TRANSPARENT_HUGEPAGE */
 
 static inline int remap_4k_pfn(struct vm_area_struct *vma, unsigned long addr,
@@ -111,7 +82,6 @@ static inline int remap_4k_pfn(struct vm_area_struct *vma, unsigned long addr,
         if (radix_enabled())
                 BUG();
         return hash__remap_4k_pfn(vma, addr, pfn, prot);
-
 }
 #endif  /* __ASSEMBLY__ */
 #endif /*_ASM_POWERPC_BOOK3S_64_PGTABLE_64K_H */
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index dfdd1f4e4cf0..5f290d39e563 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -769,7 +769,6 @@ static inline int __meminit vmemmap_create_mapping(unsigned long start,
 static inline void vmemmap_remove_mapping(unsigned long start,
                                           unsigned long page_size)
 {
-
         if (radix_enabled())
                 return radix__vmemmap_remove_mapping(start, page_size);
         return hash__vmemmap_remove_mapping(start, page_size);
@@ -825,11 +824,52 @@ extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
                        pmd_t *pmdp, pmd_t pmd);
 extern void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
                                  pmd_t *pmd);
-extern int has_transparent_hugepage(void);
+extern int hash__has_transparent_hugepage(void);
+static inline int has_transparent_hugepage(void)
+{
+        return hash__has_transparent_hugepage();
+}
 
-static inline pmd_t pmd_mkhuge(pmd_t pmd)
+static inline unsigned long
+pmd_hugepage_update(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp,
+                    unsigned long clr, unsigned long set)
 {
-        return __pmd(pmd_val(pmd) | (_PAGE_PTE | H_PAGE_THP_HUGE));
+        return hash__pmd_hugepage_update(mm, addr, pmdp, clr, set);
+}
+
+static inline int pmd_large(pmd_t pmd)
+{
+        return !!(pmd_val(pmd) & _PAGE_PTE);
+}
+
+static inline pmd_t pmd_mknotpresent(pmd_t pmd)
+{
+        return __pmd(pmd_val(pmd) & ~_PAGE_PRESENT);
+}
+/*
+ * For radix we should always find H_PAGE_HASHPTE zero. Hence
+ * the below will work for radix too
+ */
+static inline int __pmdp_test_and_clear_young(struct mm_struct *mm,
+                                              unsigned long addr, pmd_t *pmdp)
+{
+        unsigned long old;
+
+        if ((pmd_val(*pmdp) & (_PAGE_ACCESSED | H_PAGE_HASHPTE)) == 0)
+                return 0;
+        old = pmd_hugepage_update(mm, addr, pmdp, _PAGE_ACCESSED, 0);
+        return ((old & _PAGE_ACCESSED) != 0);
+}
+
+#define __HAVE_ARCH_PMDP_SET_WRPROTECT
+static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr,
+                                      pmd_t *pmdp)
+{
+
+        if ((pmd_val(*pmdp) & _PAGE_WRITE) == 0)
+                return;
+
+        pmd_hugepage_update(mm, addr, pmdp, _PAGE_WRITE, 0);
 }
 
 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
@@ -842,26 +882,43 @@ extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
                                      unsigned long address, pmd_t *pmdp);
 
 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
-extern pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
-                                     unsigned long addr, pmd_t *pmdp);
+static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
+                                            unsigned long addr, pmd_t *pmdp)
+{
+        return hash__pmdp_huge_get_and_clear(mm, addr, pmdp);
+}
 
-extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
-                                 unsigned long address, pmd_t *pmdp);
+static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
+                                        unsigned long address, pmd_t *pmdp)
+{
+        return hash__pmdp_collapse_flush(vma, address, pmdp);
+}
 #define pmdp_collapse_flush pmdp_collapse_flush
 
 #define __HAVE_ARCH_PGTABLE_DEPOSIT
-extern void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
-                                       pgtable_t pgtable);
+static inline void pgtable_trans_huge_deposit(struct mm_struct *mm,
+                                              pmd_t *pmdp, pgtable_t pgtable)
+{
+        return hash__pgtable_trans_huge_deposit(mm, pmdp, pgtable);
+}
+
 #define __HAVE_ARCH_PGTABLE_WITHDRAW
-extern pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
+static inline pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm,
+                                                    pmd_t *pmdp)
+{
+        return hash__pgtable_trans_huge_withdraw(mm, pmdp);
+}
 
 #define __HAVE_ARCH_PMDP_INVALIDATE
 extern void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
                             pmd_t *pmdp);
 
 #define __HAVE_ARCH_PMDP_HUGE_SPLIT_PREPARE
-extern void pmdp_huge_split_prepare(struct vm_area_struct *vma,
-                                    unsigned long address, pmd_t *pmdp);
+static inline void pmdp_huge_split_prepare(struct vm_area_struct *vma,
+                                           unsigned long address, pmd_t *pmdp)
+{
+        return hash__pmdp_huge_split_prepare(vma, address, pmdp);
+}
 
 #define pmd_move_must_withdraw pmd_move_must_withdraw
 struct spinlock;
diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
index 47511dd00599..f2cea6d5e764 100644
--- a/arch/powerpc/mm/Makefile
+++ b/arch/powerpc/mm/Makefile
@@ -14,7 +14,7 @@ obj-$(CONFIG_PPC_MMU_NOHASH)	+= mmu_context_nohash.o tlb_nohash.o \
 obj-$(CONFIG_PPC_BOOK3E)        += tlb_low_$(CONFIG_WORD_SIZE)e.o
 hash64-$(CONFIG_PPC_NATIVE)     := hash_native_64.o
 obj-$(CONFIG_PPC_BOOK3E_64)   += pgtable-book3e.o
-obj-$(CONFIG_PPC_STD_MMU_64)    += pgtable-hash64.o hash_utils_64.o slb_low.o slb.o $(hash64-y) mmu_context_book3s64.o
+obj-$(CONFIG_PPC_STD_MMU_64)    += pgtable-hash64.o hash_utils_64.o slb_low.o slb.o $(hash64-y) mmu_context_book3s64.o pgtable-book3s64.o
 obj-$(CONFIG_PPC_RADIX_MMU)     += pgtable-radix.o tlb-radix.o
 obj-$(CONFIG_PPC_STD_MMU_32)    += ppc_mmu_32.o hash_low_32.o mmu_context_hash32.o
 obj-$(CONFIG_PPC_STD_MMU)       += tlb_hash$(CONFIG_WORD_SIZE).o
diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c
new file mode 100644
index 000000000000..d566a250164d
--- /dev/null
+++ b/arch/powerpc/mm/pgtable-book3s64.c
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/sched.h>
+#include <asm/pgalloc.h>
+#include <asm/tlb.h>
+
+#include "mmu_decl.h"
+#include <trace/events/thp.h>
+
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+/*
+ * This is called when relaxing access to a hugepage. It's also called in the page
+ * fault path when we don't hit any of the major fault cases, ie, a minor
+ * update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have
+ * handled those two for us, we additionally deal with missing execute
+ * permission here on some processors
+ */
+int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
+                          pmd_t *pmdp, pmd_t entry, int dirty)
+{
+        int changed;
+#ifdef CONFIG_DEBUG_VM
+        WARN_ON(!pmd_trans_huge(*pmdp));
+        assert_spin_locked(&vma->vm_mm->page_table_lock);
+#endif
+        changed = !pmd_same(*(pmdp), entry);
+        if (changed) {
+                __ptep_set_access_flags(pmdp_ptep(pmdp), pmd_pte(entry));
+                /*
+                 * Since we are not supporting SW TLB systems, we don't
+                 * have any thing similar to flush_tlb_page_nohash()
+                 */
+        }
+        return changed;
+}
+
+int pmdp_test_and_clear_young(struct vm_area_struct *vma,
+                              unsigned long address, pmd_t *pmdp)
+{
+        return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp);
+}
+/*
+ * set a new huge pmd. We should not be called for updating
+ * an existing pmd entry. That should go via pmd_hugepage_update.
+ */
+void set_pmd_at(struct mm_struct *mm, unsigned long addr,
+                pmd_t *pmdp, pmd_t pmd)
+{
+#ifdef CONFIG_DEBUG_VM
+        WARN_ON(pte_present(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp)));
+        assert_spin_locked(&mm->page_table_lock);
+        WARN_ON(!pmd_trans_huge(pmd));
+#endif
+        trace_hugepage_set_pmd(addr, pmd_val(pmd));
+        return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd));
+}
+/*
+ * We use this to invalidate a pmdp entry before switching from a
+ * hugepte to regular pmd entry.
+ */
+void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
+                     pmd_t *pmdp)
+{
+        pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0);
+
+        /*
+         * This ensures that generic code that rely on IRQ disabling
+         * to prevent a parallel THP split work as expected.
+         */
+        kick_all_cpus_sync();
+}
+
+static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot)
+{
+        return __pmd(pmd_val(pmd) | pgprot_val(pgprot));
+}
+
+pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot)
+{
+        unsigned long pmdv;
+
+        pmdv = (pfn << PAGE_SHIFT) & PTE_RPN_MASK;
+        return pmd_set_protbits(__pmd(pmdv), pgprot);
+}
+
+pmd_t mk_pmd(struct page *page, pgprot_t pgprot)
+{
+        return pfn_pmd(page_to_pfn(page), pgprot);
+}
+
+pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
+{
+        unsigned long pmdv;
+
+        pmdv = pmd_val(pmd);
+        pmdv &= _HPAGE_CHG_MASK;
+        return pmd_set_protbits(__pmd(pmdv), newprot);
+}
+
+/*
+ * This is called at the end of handling a user page fault, when the
+ * fault has been handled by updating a HUGE PMD entry in the linux page tables.
+ * We use it to preload an HPTE into the hash table corresponding to
+ * the updated linux HUGE PMD entry.
+ */
+void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
+                          pmd_t *pmd)
+{
+        return;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
diff --git a/arch/powerpc/mm/pgtable-hash64.c b/arch/powerpc/mm/pgtable-hash64.c
index 9699a1ccedb5..c23e286a6b8f 100644
--- a/arch/powerpc/mm/pgtable-hash64.c
+++ b/arch/powerpc/mm/pgtable-hash64.c
@@ -99,35 +99,9 @@ int hash__map_kernel_page(unsigned long ea, unsigned long pa, unsigned long flag
 
 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
 
-/*
- * This is called when relaxing access to a hugepage. It's also called in the page
- * fault path when we don't hit any of the major fault cases, ie, a minor
- * update of _PAGE_ACCESSED, _PAGE_DIRTY, etc... The generic code will have
- * handled those two for us, we additionally deal with missing execute
- * permission here on some processors
- */
-int pmdp_set_access_flags(struct vm_area_struct *vma, unsigned long address,
-                          pmd_t *pmdp, pmd_t entry, int dirty)
-{
-        int changed;
-#ifdef CONFIG_DEBUG_VM
-        WARN_ON(!pmd_trans_huge(*pmdp));
-        assert_spin_locked(&vma->vm_mm->page_table_lock);
-#endif
-        changed = !pmd_same(*(pmdp), entry);
-        if (changed) {
-                __ptep_set_access_flags(pmdp_ptep(pmdp), pmd_pte(entry));
-                /*
-                 * Since we are not supporting SW TLB systems, we don't
-                 * have any thing similar to flush_tlb_page_nohash()
-                 */
-        }
-        return changed;
-}
-
-unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
-                                  pmd_t *pmdp, unsigned long clr,
-                                  unsigned long set)
+unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
+                                    pmd_t *pmdp, unsigned long clr,
+                                    unsigned long set)
 {
         __be64 old_be, tmp;
         unsigned long old;
@@ -158,8 +132,8 @@ unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
         return old;
 }
 
-pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
-                          pmd_t *pmdp)
+pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
+                            pmd_t *pmdp)
 {
         pmd_t pmd;
 
@@ -198,24 +172,11 @@ pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
 }
 
 /*
- * We currently remove entries from the hashtable regardless of whether
- * the entry was young or dirty.
- *
- * We should be more intelligent about this but for the moment we override
- * these functions and force a tlb flush unconditionally
- */
-int pmdp_test_and_clear_young(struct vm_area_struct *vma,
-                              unsigned long address, pmd_t *pmdp)
-{
-        return __pmdp_test_and_clear_young(vma->vm_mm, address, pmdp);
-}
-
-/*
  * We want to put the pgtable in pmd and use pgtable for tracking
  * the base page size hptes
  */
-void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
-                                pgtable_t pgtable)
+void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
+                                  pgtable_t pgtable)
 {
         pgtable_t *pgtable_slot;
         assert_spin_locked(&mm->page_table_lock);
@@ -233,7 +194,7 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
         smp_wmb();
 }
 
-pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
+pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
 {
         pgtable_t pgtable;
         pgtable_t *pgtable_slot;
@@ -253,8 +214,8 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
         return pgtable;
 }
 
-void pmdp_huge_split_prepare(struct vm_area_struct *vma,
-                             unsigned long address, pmd_t *pmdp)
+void hash__pmdp_huge_split_prepare(struct vm_area_struct *vma,
+                               unsigned long address, pmd_t *pmdp)
 {
         VM_BUG_ON(address & ~HPAGE_PMD_MASK);
         VM_BUG_ON(REGION_ID(address) != USER_REGION_ID);
@@ -274,39 +235,6 @@ void pmdp_huge_split_prepare(struct vm_area_struct *vma,
         pmd_hugepage_update(vma->vm_mm, address, pmdp, 0, _PAGE_PRIVILEGED);
 }
 
-
-/*
- * set a new huge pmd. We should not be called for updating
- * an existing pmd entry. That should go via pmd_hugepage_update.
- */
-void set_pmd_at(struct mm_struct *mm, unsigned long addr,
-                pmd_t *pmdp, pmd_t pmd)
-{
-#ifdef CONFIG_DEBUG_VM
-        WARN_ON(pte_present(pmd_pte(*pmdp)) && !pte_protnone(pmd_pte(*pmdp)));
-        assert_spin_locked(&mm->page_table_lock);
-        WARN_ON(!pmd_trans_huge(pmd));
-#endif
-        trace_hugepage_set_pmd(addr, pmd_val(pmd));
-        return set_pte_at(mm, addr, pmdp_ptep(pmdp), pmd_pte(pmd));
-}
-
-/*
- * We use this to invalidate a pmdp entry before switching from a
- * hugepte to regular pmd entry.
- */
-void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
-                     pmd_t *pmdp)
-{
-        pmd_hugepage_update(vma->vm_mm, address, pmdp, _PAGE_PRESENT, 0);
-
-        /*
-         * This ensures that generic code that rely on IRQ disabling
-         * to prevent a parallel THP split work as expected.
-         */
-        kick_all_cpus_sync();
-}
-
 /*
  * A linux hugepage PMD was changed and the corresponding hash table entries
  * neesd to be flushed.
@@ -346,47 +274,8 @@ void hpte_do_hugepage_flush(struct mm_struct *mm, unsigned long addr,
         return flush_hash_hugepage(vsid, addr, pmdp, psize, ssize, flags);
 }
 
-static pmd_t pmd_set_protbits(pmd_t pmd, pgprot_t pgprot)
-{
-        return __pmd(pmd_val(pmd) | pgprot_val(pgprot));
-}
-
-pmd_t pfn_pmd(unsigned long pfn, pgprot_t pgprot)
-{
-        unsigned long pmdv;
-
-        pmdv = (pfn << PAGE_SHIFT) & PTE_RPN_MASK;
-        return pmd_set_protbits(__pmd(pmdv), pgprot);
-}
-
-pmd_t mk_pmd(struct page *page, pgprot_t pgprot)
-{
-        return pfn_pmd(page_to_pfn(page), pgprot);
-}
-
-pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
-{
-        unsigned long pmdv;
-
-        pmdv = pmd_val(pmd);
-        pmdv &= _HPAGE_CHG_MASK;
-        return pmd_set_protbits(__pmd(pmdv), newprot);
-}
-
-/*
- * This is called at the end of handling a user page fault, when the
- * fault has been handled by updating a HUGE PMD entry in the linux page tables.
- * We use it to preload an HPTE into the hash table corresponding to
- * the updated linux HUGE PMD entry.
- */
-void update_mmu_cache_pmd(struct vm_area_struct *vma, unsigned long addr,
-                          pmd_t *pmd)
-{
-        return;
-}
-
-pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
-                              unsigned long addr, pmd_t *pmdp)
+pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
+                                unsigned long addr, pmd_t *pmdp)
 {
         pmd_t old_pmd;
         pgtable_t pgtable;
@@ -421,7 +310,7 @@ pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
         return old_pmd;
 }
 
-int has_transparent_hugepage(void)
+int hash__has_transparent_hugepage(void)
 {
 
         if (!mmu_has_feature(MMU_FTR_16M_PAGE))