From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Fri, 8 Feb 2008 12:22:04 +0000 (-0800)
Subject: CONFIG_HIGHPTE vs. sub-page page tables.
X-Git-Tag: v2.6.25-rc1~56
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f569afd9ced9ebec9a6eb3dbf6f83429be0a7b4;p=linux-2.6

CONFIG_HIGHPTE vs. sub-page page tables.

Background: I've implemented 1K/2K page tables for s390.  These sub-page
page tables are required to properly support the s390 virtualization
instruction with KVM.  The SIE instruction requires that the page tables
have 256 page table entries (pte) followed by 256 page status table entries
(pgste).  The pgstes are only required if the process is using the SIE
instruction.  The pgstes are updated by the hardware and by the hypervisor
for a number of reasons, one of them is dirty and reference bit tracking.
To avoid wasting memory the standard pte table allocation should return
1K/2K (31/64 bit) and 2K/4K if the process is using SIE.

Problem: Page size on s390 is 4K, page table size is 1K or 2K.  That means
the s390 version for pte_alloc_one cannot return a pointer to a struct
page.  Trouble is that with the CONFIG_HIGHPTE feature on x86 pte_alloc_one
cannot return a pointer to a pte either, since that would require more than
32 bit for the return value of pte_alloc_one (and the pte * would not be
accessible since its not kmapped).

Solution: The only solution I found to this dilemma is a new typedef: a
pgtable_t.  For s390 pgtable_t will be a (pte *) - to be introduced with a
later patch.  For everybody else it will be a (struct page *).  The
additional problem with the initialization of the ptl lock and the
NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor and
a destructor pgtable_page_dtor.  The page table allocation and free
functions need to call these two whenever a page table page is allocated or
freed.  pmd_populate will get a pgtable_t instead of a struct page pointer.
 To get the pgtable_t back from a pmd entry that has been installed with
pmd_populate a new function pmd_pgtable is added.  It replaces the pmd_page
call in free_pte_range and apply_to_pte_range.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/frv/mm/pgalloc.c b/arch/frv/mm/pgalloc.c
index 1a2e5c8d03..66f616fb48 100644
--- a/arch/frv/mm/pgalloc.c
+++ b/arch/frv/mm/pgalloc.c
@@ -28,7 +28,7 @@ pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
 	return pte;
 }
 
-struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	struct page *page;
 
@@ -37,9 +37,11 @@ struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
 #else
 	page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
 #endif
-	if (page)
+	if (page) {
 		clear_highpage(page);
-	flush_dcache_page(page);
+		pgtable_page_ctor(page);
+		flush_dcache_page(page);
+	}
 	return page;
 }
 
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index f80f90c4d5..ac3390f819 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -107,19 +107,20 @@ __init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long add
 	return pte;
 }
 
-struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	struct page *ptepage;
 
 #ifdef CONFIG_HIGHPTE
-	gfp_t flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT;
+	gfp_t flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT | __GFP_ZERO;
 #else
-	gfp_t flags = GFP_KERNEL | __GFP_REPEAT;
+	gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO;
 #endif
 
 	ptepage = alloc_pages(flags, 0);
-	if (ptepage)
-		clear_highpage(ptepage);
+	if (!ptepage)
+		return NULL;
+	pgtable_page_ctor(ptepage);
 	return ptepage;
 }
 
@@ -131,11 +132,12 @@ void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte);
 }
 
-void pte_free(struct mm_struct *mm, struct page *ptepage)
+void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 {
 #ifdef CONFIG_SMP
 	hash_page_sync();
 #endif
+	pgtable_page_dtor(ptepage);
 	__free_page(ptepage);
 }
 
diff --git a/arch/ppc/mm/pgtable.c b/arch/ppc/mm/pgtable.c
index 409fcaa499..03a79bff12 100644
--- a/arch/ppc/mm/pgtable.c
+++ b/arch/ppc/mm/pgtable.c
@@ -95,7 +95,7 @@ __init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long add
 	return pte;
 }
 
-struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	struct page *ptepage;
 
@@ -106,8 +106,10 @@ struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
 #endif
 
 	ptepage = alloc_pages(flags, 0);
-	if (ptepage)
+	if (ptepage) {
 		clear_highpage(ptepage);
+		pgtable_page_ctor(ptepage);
+	}
 	return ptepage;
 }
 
@@ -119,11 +121,12 @@ void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte);
 }
 
-void pte_free(struct mm_struct *mm, struct page *ptepage)
+void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 {
 #ifdef CONFIG_SMP
 	hash_page_sync();
 #endif
+	pgtable_page_dtor(ptepage);
 	__free_page(ptepage);
 }
 
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index e60e0ae134..019f518cd5 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -78,6 +78,7 @@ unsigned long *page_table_alloc(int noexec)
 		clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
 		page->index = (addr_t) table;
 	}
+	pgtable_page_ctor(page);
 	table = (unsigned long *) page_to_phys(page);
 	clear_table(table, _PAGE_TYPE_EMPTY, PAGE_SIZE);
 	return table;
@@ -87,6 +88,7 @@ void page_table_free(unsigned long *table)
 {
 	unsigned long *shadow = get_shadow_pte(table);
 
+	pgtable_page_dtor(virt_to_page(table));
 	if (shadow)
 		free_page((unsigned long) shadow);
 	free_page((unsigned long) table);
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index dc98e3844a..23d3291a3e 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -489,14 +489,17 @@ srmmu_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
 	return (pte_t *)srmmu_get_nocache(PTE_SIZE, PTE_SIZE);
 }
 
-static struct page *
+static pgtable_t
 srmmu_pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	unsigned long pte;
+	struct page *page;
 
 	if ((pte = (unsigned long)srmmu_pte_alloc_one_kernel(mm, address)) == 0)
 		return NULL;
-	return pfn_to_page( __nocache_pa(pte) >> PAGE_SHIFT );
+	page = pfn_to_page( __nocache_pa(pte) >> PAGE_SHIFT );
+	pgtable_page_ctor(page);
+	return page;
 }
 
 static void srmmu_free_pte_fast(pte_t *pte)
@@ -504,10 +507,11 @@ static void srmmu_free_pte_fast(pte_t *pte)
 	srmmu_free_nocache((unsigned long)pte, PTE_SIZE);
 }
 
-static void srmmu_pte_free(struct page *pte)
+static void srmmu_pte_free(pgtable_t pte)
 {
 	unsigned long p;
 
+	pgtable_page_dtor(pte);
 	p = (unsigned long)page_address(pte);	/* Cached address (for test) */
 	if (p == 0)
 		BUG();
diff --git a/arch/sparc/mm/sun4c.c b/arch/sparc/mm/sun4c.c
index 0729305f2f..c0442e8c4b 100644
--- a/arch/sparc/mm/sun4c.c
+++ b/arch/sparc/mm/sun4c.c
@@ -1947,12 +1947,17 @@ static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long add
 	return pte;
 }
 
-static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
+static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
-	pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
+	pte_t *pte;
+	struct page *page;
+
+	pte = sun4c_pte_alloc_one_kernel(mm, address);
 	if (pte == NULL)
 		return NULL;
-	return virt_to_page(pte);
+	page = virt_to_page(pte);
+	pgtable_page_ctor(page);
+	return page;
 }
 
 static inline void sun4c_free_pte_fast(pte_t *pte)
@@ -1962,8 +1967,9 @@ static inline void sun4c_free_pte_fast(pte_t *pte)
 	pgtable_cache_size++;
 }
 
-static void sun4c_pte_free(struct page *pte)
+static void sun4c_pte_free(pgtable_t pte)
 {
+	pgtable_page_dtor(pte);
 	sun4c_free_pte_fast(page_address(pte));
 }
 
diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index d872fdce1d..2627ce82e9 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -354,11 +354,13 @@ pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
 	return pte;
 }
 
-struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	struct page *pte;
 
 	pte = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+	if (pte)
+		pgtable_page_ctor(pte);
 	return pte;
 }
 
diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
index 6c1914622a..73aba71252 100644
--- a/arch/x86/mm/pgtable_32.c
+++ b/arch/x86/mm/pgtable_32.c
@@ -183,7 +183,7 @@ pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
 	return (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
 }
 
-struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	struct page *pte;
 
@@ -192,6 +192,8 @@ struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
 #else
 	pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
 #endif
+	if (pte)
+		pgtable_page_ctor(pte);
 	return pte;
 }
 
@@ -365,6 +367,7 @@ void check_pgt_cache(void)
 
 void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
 {
+	pgtable_page_dtor(pte);
 	paravirt_release_pt(page_to_pfn(pte));
 	tlb_remove_page(tlb, pte);
 }
diff --git a/include/asm-alpha/page.h b/include/asm-alpha/page.h
index 05f09f997d..22ff9762d1 100644
--- a/include/asm-alpha/page.h
+++ b/include/asm-alpha/page.h
@@ -62,6 +62,8 @@ typedef unsigned long pgprot_t;
 
 #endif /* STRICT_MM_TYPECHECKS */
 
+typedef struct page *pgtable_t;
+
 #ifdef USE_48_BIT_KSEG
 #define PAGE_OFFSET		0xffff800000000000UL
 #else
diff --git a/include/asm-alpha/pgalloc.h b/include/asm-alpha/pgalloc.h
index fdbedacc73..fd090155dc 100644
--- a/include/asm-alpha/pgalloc.h
+++ b/include/asm-alpha/pgalloc.h
@@ -11,10 +11,11 @@
  */
 
 static inline void
-pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
+pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte)
 {
 	pmd_set(pmd, (pte_t *)(page_to_pa(pte) + PAGE_OFFSET));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 static inline void
 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
@@ -57,18 +58,23 @@ pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte);
 }
 
-static inline struct page *
-pte_alloc_one(struct mm_struct *mm, unsigned long addr)
+static inline pgtable_t
+pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
-	pte_t *pte = pte_alloc_one_kernel(mm, addr);
-	if (pte)
-		return virt_to_page(pte);
-	return NULL;
+	pte_t *pte = pte_alloc_one_kernel(mm, address);
+	struct page *page;
+
+	if (!pte)
+		return NULL;
+	page = virt_to_page(pte);
+	pgtable_page_ctor(page);
+	return page;
 }
 
 static inline void
-pte_free(struct mm_struct *mm, struct page *page)
+pte_free(struct mm_struct *mm, pgtable_t page)
 {
+	pgtable_page_dtor(page);
 	__free_page(page);
 }
 
diff --git a/include/asm-arm/page.h b/include/asm-arm/page.h
index 31ff12f4ff..c86f68ee65 100644
--- a/include/asm-arm/page.h
+++ b/include/asm-arm/page.h
@@ -171,6 +171,8 @@ typedef unsigned long pgprot_t;
 
 #endif /* STRICT_MM_TYPECHECKS */
 
+typedef struct page *pgtable_t;
+
 #endif /* CONFIG_MMU */
 
 #include <asm/memory.h>
diff --git a/include/asm-arm/pgalloc.h b/include/asm-arm/pgalloc.h
index fb6c6e3222..163b0305dd 100644
--- a/include/asm-arm/pgalloc.h
+++ b/include/asm-arm/pgalloc.h
@@ -66,7 +66,7 @@ pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
 	return pte;
 }
 
-static inline struct page *
+static inline pgtable_t
 pte_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
 	struct page *pte;
@@ -75,6 +75,7 @@ pte_alloc_one(struct mm_struct *mm, unsigned long addr)
 	if (pte) {
 		void *page = page_address(pte);
 		clean_dcache_area(page, sizeof(pte_t) * PTRS_PER_PTE);
+		pgtable_page_ctor(pte);
 	}
 
 	return pte;
@@ -91,8 +92,9 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	}
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *pte)
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 {
+	pgtable_page_dtor(pte);
 	__free_page(pte);
 }
 
@@ -123,10 +125,11 @@ pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
 }
 
 static inline void
-pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep)
+pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
 {
 	__pmd_populate(pmdp, page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 #endif /* CONFIG_MMU */
 
diff --git a/include/asm-avr32/page.h b/include/asm-avr32/page.h
index ee23499cec..5582968fee 100644
--- a/include/asm-avr32/page.h
+++ b/include/asm-avr32/page.h
@@ -34,6 +34,7 @@ extern void copy_page(void *to, void *from);
 typedef struct { unsigned long pte; } pte_t;
 typedef struct { unsigned long pgd; } pgd_t;
 typedef struct { unsigned long pgprot; } pgprot_t;
+typedef struct page *pgtable_t;
 
 #define pte_val(x)		((x).pte)
 #define pgd_val(x)		((x).pgd)
diff --git a/include/asm-avr32/pgalloc.h b/include/asm-avr32/pgalloc.h
index b77e364b4c..51fc1f6e4b 100644
--- a/include/asm-avr32/pgalloc.h
+++ b/include/asm-avr32/pgalloc.h
@@ -17,10 +17,11 @@
 	set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))
 
 static __inline__ void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
-				    struct page *pte)
+				    pgtable_t pte)
 {
 	set_pmd(pmd, __pmd(_PAGE_TABLE + page_to_phys(pte)));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * Allocate and free page tables
@@ -51,7 +52,9 @@ static inline struct page *pte_alloc_one(struct mm_struct *mm,
 	struct page *pte;
 
 	pte = alloc_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
-
+	if (!pte)
+		return NULL;
+	pgtable_page_ctor(pte);
 	return pte;
 }
 
@@ -60,12 +63,17 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *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) tlb_remove_page((tlb),(pte))
+#define __pte_free_tlb(tlb,pte)				\
+do {							\
+	pgtable_page_dtor(pte);				\
+	tlb_remove_page((tlb), pte);			\
+} while (0)
 
 #define check_pgt_cache() do { } while(0)
 
diff --git a/include/asm-cris/page.h b/include/asm-cris/page.h
index 3b0156c463..c45bb1ef39 100644
--- a/include/asm-cris/page.h
+++ b/include/asm-cris/page.h
@@ -26,6 +26,7 @@
 typedef struct { unsigned long pte; } pte_t;
 typedef struct { unsigned long pgd; } pgd_t;
 typedef struct { unsigned long pgprot; } pgprot_t;
+typedef struct page *pgtable_t;
 #endif
 
 #define pte_val(x)	((x).pte)
diff --git a/include/asm-cris/pgalloc.h b/include/asm-cris/pgalloc.h
index 8ddd66f817..a1ba761d05 100644
--- a/include/asm-cris/pgalloc.h
+++ b/include/asm-cris/pgalloc.h
@@ -6,6 +6,7 @@
 
 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, pte)
 #define pmd_populate(mm, pmd, pte) pmd_set(pmd, page_address(pte))
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * Allocate and free page tables.
@@ -27,10 +28,11 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long ad
  	return pte;
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	struct page *pte;
 	pte = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
+	pgtable_page_ctor(pte);
 	return pte;
 }
 
@@ -39,13 +41,17 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *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) tlb_remove_page((tlb),(pte))
+#define __pte_free_tlb(tlb,pte)				\
+do {							\
+	pgtable_page_dtor(pte);				\
+	tlb_remove_page((tlb), pte);			\
+} while (0)
 
 #define check_pgt_cache()          do { } while (0)
 
diff --git a/include/asm-frv/page.h b/include/asm-frv/page.h
index cacc045700..c2c1e89e74 100644
--- a/include/asm-frv/page.h
+++ b/include/asm-frv/page.h
@@ -25,6 +25,7 @@ typedef struct { unsigned long	ste[64];} pmd_t;
 typedef struct { pmd_t		pue[1]; } pud_t;
 typedef struct { pud_t		pge[1];	} pgd_t;
 typedef struct { unsigned long	pgprot;	} pgprot_t;
+typedef struct page *pgtable_t;
 
 #define pte_val(x)	((x).pte)
 #define pmd_val(x)	((x).ste[0])
diff --git a/include/asm-frv/pgalloc.h b/include/asm-frv/pgalloc.h
index e89620ef08..971e6addb0 100644
--- a/include/asm-frv/pgalloc.h
+++ b/include/asm-frv/pgalloc.h
@@ -25,6 +25,7 @@
 do {										\
 	__set_pmd((PMD), page_to_pfn(PAGE) << PAGE_SHIFT | _PAGE_TABLE);	\
 } while(0)
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * Allocate and free page tables.
@@ -35,19 +36,24 @@ extern void pgd_free(struct mm_struct *mm, pgd_t *);
 
 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
 
-extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
+extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
 
 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 {
 	free_page((unsigned long)pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *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)		tlb_remove_page((tlb),(pte))
+#define __pte_free_tlb(tlb,pte)				\
+do {							\
+	pgtable_page_dtor(pte);				\
+	tlb_remove_page((tlb),(pte));			\
+} while (0)
 
 /*
  * allocating and freeing a pmd is trivial: the 1-entry pmd is
diff --git a/include/asm-ia64/page.h b/include/asm-ia64/page.h
index 8a8aa3fd7c..4999a6c637 100644
--- a/include/asm-ia64/page.h
+++ b/include/asm-ia64/page.h
@@ -185,6 +185,7 @@ get_order (unsigned long size)
 #endif
   typedef struct { unsigned long pgd; } pgd_t;
   typedef struct { unsigned long pgprot; } pgprot_t;
+  typedef struct page *pgtable_t;
 
 # define pte_val(x)	((x).pte)
 # define pmd_val(x)	((x).pmd)
@@ -206,6 +207,7 @@ get_order (unsigned long size)
     typedef unsigned long pmd_t;
     typedef unsigned long pgd_t;
     typedef unsigned long pgprot_t;
+    typedef struct page *pgtable_t;
 # endif
 
 # define pte_val(x)	(x)
diff --git a/include/asm-ia64/pgalloc.h b/include/asm-ia64/pgalloc.h
index 556d988123..b9ac1a6fc2 100644
--- a/include/asm-ia64/pgalloc.h
+++ b/include/asm-ia64/pgalloc.h
@@ -70,10 +70,11 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 #define __pmd_free_tlb(tlb, pmd)	pmd_free((tlb)->mm, pmd)
 
 static inline void
-pmd_populate(struct mm_struct *mm, pmd_t * pmd_entry, struct page *pte)
+pmd_populate(struct mm_struct *mm, pmd_t * pmd_entry, pgtable_t pte)
 {
 	pmd_val(*pmd_entry) = page_to_phys(pte);
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 static inline void
 pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmd_entry, pte_t * pte)
@@ -81,11 +82,17 @@ pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmd_entry, pte_t * pte)
 	pmd_val(*pmd_entry) = __pa(pte);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm,
-					 unsigned long addr)
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr)
 {
-	void *pg = quicklist_alloc(0, GFP_KERNEL, NULL);
-	return pg ? virt_to_page(pg) : NULL;
+	struct page *page;
+	void *pg;
+
+	pg = quicklist_alloc(0, GFP_KERNEL, NULL);
+	if (!pg)
+		return NULL;
+	page = virt_to_page(pg);
+	pgtable_page_ctor(page);
+	return page;
 }
 
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
@@ -94,8 +101,9 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 	return quicklist_alloc(0, GFP_KERNEL, NULL);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *pte)
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 {
+	pgtable_page_dtor(pte);
 	quicklist_free_page(0, NULL, pte);
 }
 
diff --git a/include/asm-m32r/page.h b/include/asm-m32r/page.h
index 05d43bbbf9..8a677f3fca 100644
--- a/include/asm-m32r/page.h
+++ b/include/asm-m32r/page.h
@@ -28,6 +28,7 @@ typedef struct { unsigned long pgd; } pgd_t;
 #define PTE_MASK	PAGE_MASK
 
 typedef struct { unsigned long pgprot; } pgprot_t;
+typedef struct page *pgtable_t;
 
 #define pmd_val(x)	((x).pmd)
 #define pgd_val(x)	((x).pgd)
diff --git a/include/asm-m32r/pgalloc.h b/include/asm-m32r/pgalloc.h
index e5921adfad..f11a2b909c 100644
--- a/include/asm-m32r/pgalloc.h
+++ b/include/asm-m32r/pgalloc.h
@@ -9,10 +9,11 @@
 	set_pmd(pmd, __pmd(_PAGE_TABLE + __pa(pte)))
 
 static __inline__ void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
-	struct page *pte)
+	pgtable_t pte)
 {
 	set_pmd(pmd, __pmd(_PAGE_TABLE + page_to_phys(pte)));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * Allocate and free page tables.
@@ -37,12 +38,12 @@ static __inline__ pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 	return pte;
 }
 
-static __inline__ struct page *pte_alloc_one(struct mm_struct *mm,
+static __inline__ pgtable_t pte_alloc_one(struct mm_struct *mm,
 	unsigned long address)
 {
 	struct page *pte = alloc_page(GFP_KERNEL|__GFP_ZERO);
 
-
+	pgtable_page_ctor(pte);
 	return pte;
 }
 
@@ -51,8 +52,9 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *pte)
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 {
+	pgtable_page_dtor(pte);
 	__free_page(pte);
 }
 
diff --git a/include/asm-m68k/motorola_pgalloc.h b/include/asm-m68k/motorola_pgalloc.h
index 500ec9b8b1..d08bf6261d 100644
--- a/include/asm-m68k/motorola_pgalloc.h
+++ b/include/asm-m68k/motorola_pgalloc.h
@@ -7,7 +7,6 @@
 extern pmd_t *get_pointer_table(void);
 extern int free_pointer_table(pmd_t *);
 
-
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
 {
 	pte_t *pte;
@@ -28,7 +27,7 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long) pte);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	struct page *page = alloc_pages(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO, 0);
 	pte_t *pte;
@@ -43,19 +42,21 @@ static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long add
 		nocache_page(pte);
 	}
 	kunmap(pte);
-
+	pgtable_page_ctor(page);
 	return page;
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *page)
+static inline void pte_free(struct mm_struct *mm, pgtable_t page)
 {
+	pgtable_page_dtor(page);
 	cache_page(kmap(page));
 	kunmap(page);
 	__free_page(page);
 }
 
-static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *page)
+static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page)
 {
+	pgtable_page_dtor(page);
 	cache_page(kmap(page));
 	kunmap(page);
 	__free_page(page);
@@ -94,10 +95,11 @@ static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *
 	pmd_set(pmd, pte);
 }
 
-static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
+static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
 {
 	pmd_set(pmd, page_address(page));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
 {
diff --git a/include/asm-m68k/page.h b/include/asm-m68k/page.h
index 3f29e2a03a..880c2cbff8 100644
--- a/include/asm-m68k/page.h
+++ b/include/asm-m68k/page.h
@@ -91,6 +91,7 @@ typedef struct { unsigned long pte; } pte_t;
 typedef struct { unsigned long pmd[16]; } pmd_t;
 typedef struct { unsigned long pgd; } pgd_t;
 typedef struct { unsigned long pgprot; } pgprot_t;
+typedef struct page *pgtable_t;
 
 #define pte_val(x)	((x).pte)
 #define pmd_val(x)	((&x)->pmd[0])
diff --git a/include/asm-m68k/sun3_pgalloc.h b/include/asm-m68k/sun3_pgalloc.h
index a5a91e7271..d4c83f1438 100644
--- a/include/asm-m68k/sun3_pgalloc.h
+++ b/include/asm-m68k/sun3_pgalloc.h
@@ -26,12 +26,17 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
         free_page((unsigned long) pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *page)
+static inline void pte_free(struct mm_struct *mm, pgtable_t page)
 {
+	pgtable_page_dtor(page);
         __free_page(page);
 }
 
-#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
+#define __pte_free_tlb(tlb,pte)				\
+do {							\
+	pgtable_page_dtor(pte);				\
+	tlb_remove_page((tlb), pte);			\
+} while (0)
 
 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 					  unsigned long address)
@@ -45,8 +50,8 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 	return (pte_t *) (page);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm,
-					 unsigned long address)
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
+					unsigned long address)
 {
         struct page *page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
 
@@ -54,6 +59,7 @@ static inline struct page *pte_alloc_one(struct mm_struct *mm,
 		return NULL;
 
 	clear_highpage(page);
+	pgtable_page_ctor(page);
 	return page;
 
 }
@@ -63,10 +69,11 @@ static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *
 	pmd_val(*pmd) = __pa((unsigned long)pte);
 }
 
-static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
+static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
 {
 	pmd_val(*pmd) = __pa((unsigned long)page_address(page));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * allocating and freeing a pmd is trivial: the 1-entry pmd is
diff --git a/include/asm-mips/page.h b/include/asm-mips/page.h
index 635aa44d22..8735aa0b89 100644
--- a/include/asm-mips/page.h
+++ b/include/asm-mips/page.h
@@ -90,6 +90,7 @@ typedef struct { unsigned long pte; } pte_t;
 #define pte_val(x)	((x).pte)
 #define __pte(x)	((pte_t) { (x) } )
 #endif
+typedef struct page *pgtable_t;
 
 /*
  * For 3-level pagetables we defines these ourselves, for 2-level the
diff --git a/include/asm-mips/pgalloc.h b/include/asm-mips/pgalloc.h
index c4efeced83..1275831dda 100644
--- a/include/asm-mips/pgalloc.h
+++ b/include/asm-mips/pgalloc.h
@@ -20,10 +20,11 @@ static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 }
 
 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
-	struct page *pte)
+	pgtable_t pte)
 {
 	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * Initialize a new pmd table with invalid pointers.
@@ -79,9 +80,10 @@ static inline struct page *pte_alloc_one(struct mm_struct *mm,
 	struct page *pte;
 
 	pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
-	if (pte)
+	if (pte) {
 		clear_highpage(pte);
-
+		pgtable_page_ctor(pte);
+	}
 	return pte;
 }
 
@@ -90,12 +92,17 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_pages((unsigned long)pte, PTE_ORDER);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *pte)
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 {
+	pgtable_page_dtor(pte);
 	__free_pages(pte, PTE_ORDER);
 }
 
-#define __pte_free_tlb(tlb, pte)	tlb_remove_page((tlb), (pte))
+#define __pte_free_tlb(tlb,pte)				\
+do {							\
+	pgtable_page_dtor(pte);				\
+	tlb_remove_page((tlb), pte);			\
+} while (0)
 
 #ifdef CONFIG_32BIT
 
diff --git a/include/asm-parisc/page.h b/include/asm-parisc/page.h
index b08d9151c7..27d50b8595 100644
--- a/include/asm-parisc/page.h
+++ b/include/asm-parisc/page.h
@@ -91,6 +91,7 @@ typedef unsigned long pgprot_t;
 
 #endif /* STRICT_MM_TYPECHECKS */
 
+typedef struct page *pgtable_t;
 
 typedef struct __physmem_range {
 	unsigned long start_pfn;
diff --git a/include/asm-parisc/pgalloc.h b/include/asm-parisc/pgalloc.h
index aab66f1bea..3996dfc30a 100644
--- a/include/asm-parisc/pgalloc.h
+++ b/include/asm-parisc/pgalloc.h
@@ -115,11 +115,14 @@ pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
 
 #define pmd_populate(mm, pmd, pte_page) \
 	pmd_populate_kernel(mm, pmd, page_address(pte_page))
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
-static inline struct page *
+static inline pgtable_t
 pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
 	struct page *page = alloc_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
+	if (page)
+		pgtable_page_ctor(page);
 	return page;
 }
 
@@ -135,7 +138,11 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte);
 }
 
-#define pte_free(mm, page) pte_free_kernel(page_address(page))
+static inline void pte_free_kernel(struct mm_struct *mm, struct page *pte)
+{
+	pgtable_page_dtor(pte);
+	pte_free_kernel(page_address((pte));
+}
 
 #define check_pgt_cache()	do { } while (0)
 
diff --git a/include/asm-powerpc/page.h b/include/asm-powerpc/page.h
index 61e3725bbd..df47bbb6ea 100644
--- a/include/asm-powerpc/page.h
+++ b/include/asm-powerpc/page.h
@@ -190,6 +190,8 @@ extern int page_is_ram(unsigned long pfn);
 
 struct vm_area_struct;
 
+typedef struct page *pgtable_t;
+
 #include <asm-generic/memory_model.h>
 #endif /* __ASSEMBLY__ */
 
diff --git a/include/asm-powerpc/pgalloc-32.h b/include/asm-powerpc/pgalloc-32.h
index c162a4c37b..58c07147b3 100644
--- a/include/asm-powerpc/pgalloc-32.h
+++ b/include/asm-powerpc/pgalloc-32.h
@@ -22,17 +22,19 @@ extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 		(pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
 #define pmd_populate(mm, pmd, pte)	\
 		(pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) | _PMD_PRESENT)
+#define pmd_pgtable(pmd) pmd_page(pmd)
 #else
 #define pmd_populate_kernel(mm, pmd, pte)	\
 		(pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
 #define pmd_populate(mm, pmd, pte)	\
 		(pmd_val(*(pmd)) = (unsigned long)lowmem_page_address(pte) | _PMD_PRESENT)
+#define pmd_pgtable(pmd) pmd_page(pmd)
 #endif
 
 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
-extern struct page *pte_alloc_one(struct mm_struct *mm, unsigned long addr);
+extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
 extern void pte_free_kernel(struct mm_struct *mm, pte_t *pte);
-extern void pte_free(struct mm_struct *mm, struct page *pte);
+extern void pte_free(struct mm_struct *mm, pgtable_t pte);
 
 #define __pte_free_tlb(tlb, pte)	pte_free((tlb)->mm, (pte))
 
diff --git a/include/asm-powerpc/pgalloc-64.h b/include/asm-powerpc/pgalloc-64.h
index 5afae85939..68980990f6 100644
--- a/include/asm-powerpc/pgalloc-64.h
+++ b/include/asm-powerpc/pgalloc-64.h
@@ -58,6 +58,7 @@ static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 #define pmd_populate(mm, pmd, pte_page) \
 	pmd_populate_kernel(mm, pmd, page_address(pte_page))
 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 
 #else /* CONFIG_PPC_64K_PAGES */
@@ -72,6 +73,7 @@ static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 
 #define pmd_populate(mm, pmd, pte_page) \
 	pmd_populate_kernel(mm, pmd, page_address(pte_page))
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 #endif /* CONFIG_PPC_64K_PAGES */
 
@@ -92,11 +94,18 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm,
-					 unsigned long address)
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
+					unsigned long address)
 {
-	pte_t *pte = pte_alloc_one_kernel(mm, address);
-	return pte ? virt_to_page(pte) : NULL;
+	struct page *page;
+	pte_t *pte;
+
+	pte = pte_alloc_one_kernel(mm, address);
+	if (!pte)
+		return NULL;
+	page = virt_to_page(pte);
+	pgtable_page_ctor(page);
+	return page;
 }
 
 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
@@ -104,8 +113,9 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *ptepage)
+static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 {
+	pgtable_page_dtor(ptepage);
 	__free_page(ptepage);
 }
 
@@ -136,9 +146,12 @@ static inline void pgtable_free(pgtable_free_t pgf)
 
 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
 
-#define __pte_free_tlb(tlb, ptepage)	\
+#define __pte_free_tlb(tlb,ptepage)	\
+do { \
+	pgtable_page_dtor(ptepage); \
 	pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
-		PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1))
+		PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1)); \
+} while (0)
 #define __pmd_free_tlb(tlb, pmd) 	\
 	pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 		PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
diff --git a/include/asm-ppc/pgalloc.h b/include/asm-ppc/pgalloc.h
index 7c39a95829..fd4d1d74cf 100644
--- a/include/asm-ppc/pgalloc.h
+++ b/include/asm-ppc/pgalloc.h
@@ -23,17 +23,19 @@ extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 		(pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
 #define pmd_populate(mm, pmd, pte)	\
 		(pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) | _PMD_PRESENT)
+#define pmd_pgtable(pmd) pmd_page(pmd)
 #else
 #define pmd_populate_kernel(mm, pmd, pte)	\
 		(pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
 #define pmd_populate(mm, pmd, pte)	\
 		(pmd_val(*(pmd)) = (unsigned long)lowmem_page_address(pte) | _PMD_PRESENT)
+#define pmd_pgtable(pmd) pmd_page(pmd)
 #endif
 
 extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
-extern struct page *pte_alloc_one(struct mm_struct *mm, unsigned long addr);
+extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long addr);
 extern void pte_free_kernel(struct mm_struct *mm, pte_t *pte);
-extern void pte_free(struct mm_struct *mm, struct page *pte);
+extern void pte_free(struct mm_struct *mm, pgtable_t pte);
 
 #define __pte_free_tlb(tlb, pte)	pte_free((tlb)->mm, (pte))
 
diff --git a/include/asm-s390/page.h b/include/asm-s390/page.h
index a55f9d979d..7f29a981f4 100644
--- a/include/asm-s390/page.h
+++ b/include/asm-s390/page.h
@@ -109,6 +109,8 @@ typedef struct { unsigned long pgd; } pgd_t;
 
 #endif /* __s390x__ */
 
+typedef struct page *pgtable_t;
+
 #define __pte(x)        ((pte_t) { (x) } )
 #define __pmd(x)        ((pmd_t) { (x) } )
 #define __pgd(x)        ((pgd_t) { (x) } )
diff --git a/include/asm-s390/pgalloc.h b/include/asm-s390/pgalloc.h
index 6f6619ba89..900d44807e 100644
--- a/include/asm-s390/pgalloc.h
+++ b/include/asm-s390/pgalloc.h
@@ -132,7 +132,7 @@ pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
 }
 
 static inline void
-pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
+pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
 {
 	pte_t *pte = (pte_t *)page_to_phys(page);
 	pmd_t *shadow_pmd = get_shadow_table(pmd);
@@ -142,6 +142,7 @@ pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
 	if (shadow_pmd && shadow_pte)
 		pmd_populate_kernel(mm, shadow_pmd, shadow_pte);
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * page table entry allocation/free routines.
diff --git a/include/asm-s390/tlb.h b/include/asm-s390/tlb.h
index 985de2b882..3c8177fa9e 100644
--- a/include/asm-s390/tlb.h
+++ b/include/asm-s390/tlb.h
@@ -95,7 +95,7 @@ static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
  * pte_free_tlb frees a pte table and clears the CRSTE for the
  * page table from the tlb.
  */
-static inline void pte_free_tlb(struct mmu_gather *tlb, struct page *page)
+static inline void pte_free_tlb(struct mmu_gather *tlb, pgtable_t page)
 {
 	if (!tlb->fullmm) {
 		tlb->array[tlb->nr_ptes++] = page;
diff --git a/include/asm-sh/page.h b/include/asm-sh/page.h
index e0fe02950f..134562dc8c 100644
--- a/include/asm-sh/page.h
+++ b/include/asm-sh/page.h
@@ -100,6 +100,8 @@ typedef struct { unsigned long pgd; } pgd_t;
 #define __pgd(x) ((pgd_t) { (x) } )
 #define __pgprot(x)	((pgprot_t) { (x) } )
 
+typedef struct page *pgtable_t;
+
 #endif /* !__ASSEMBLY__ */
 
 /*
diff --git a/include/asm-sh/pgalloc.h b/include/asm-sh/pgalloc.h
index 59ca16d77a..84dd2db710 100644
--- a/include/asm-sh/pgalloc.h
+++ b/include/asm-sh/pgalloc.h
@@ -14,10 +14,11 @@ static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 }
 
 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
-				struct page *pte)
+				pgtable_t pte)
 {
 	set_pmd(pmd, __pmd((unsigned long)page_address(pte)));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 static inline void pgd_ctor(void *x)
 {
@@ -47,11 +48,18 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 	return quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm,
-					 unsigned long address)
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
+					unsigned long address)
 {
-	void *pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
-	return pg ? virt_to_page(pg) : NULL;
+	struct page *page;
+	void *pg;
+
+	pg = quicklist_alloc(QUICK_PT, GFP_KERNEL | __GFP_REPEAT, NULL);
+	if (!pg)
+		return NULL;
+	page = virt_to_page(pg);
+	pgtable_page_ctor(page);
+	return page;
 }
 
 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
@@ -59,12 +67,17 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	quicklist_free(QUICK_PT, NULL, pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *pte)
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 {
+	pgtable_page_dtor(pte);
 	quicklist_free_page(QUICK_PT, NULL, pte);
 }
 
-#define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
+#define __pte_free_tlb(tlb,pte)				\
+do {							\
+	pgtable_page_dtor(pte);				\
+	tlb_remove_page((tlb), (pte));			\
+} while (0)
 
 /*
  * allocating and freeing a pmd is trivial: the 1-entry pmd is
diff --git a/include/asm-sparc/page.h b/include/asm-sparc/page.h
index cbc48c0c4e..39ccf2da29 100644
--- a/include/asm-sparc/page.h
+++ b/include/asm-sparc/page.h
@@ -123,6 +123,8 @@ typedef unsigned long iopgprot_t;
 
 #endif
 
+typedef struct page *pgtable_t;
+
 extern unsigned long sparc_unmapped_base;
 
 BTFIXUPDEF_SETHI(sparc_unmapped_base)
diff --git a/include/asm-sparc/pgalloc.h b/include/asm-sparc/pgalloc.h
index b5fbdd3644..6292cd00e5 100644
--- a/include/asm-sparc/pgalloc.h
+++ b/include/asm-sparc/pgalloc.h
@@ -50,10 +50,11 @@ BTFIXUPDEF_CALL(void, free_pmd_fast, pmd_t *)
 
 BTFIXUPDEF_CALL(void, pmd_populate, pmd_t *, struct page *)
 #define pmd_populate(MM, PMD, PTE)        BTFIXUP_CALL(pmd_populate)(PMD, PTE)
+#define pmd_pgtable(pmd) pmd_page(pmd)
 BTFIXUPDEF_CALL(void, pmd_set, pmd_t *, pte_t *)
 #define pmd_populate_kernel(MM, PMD, PTE) BTFIXUP_CALL(pmd_set)(PMD, PTE)
 
-BTFIXUPDEF_CALL(struct page *, pte_alloc_one, struct mm_struct *, unsigned long)
+BTFIXUPDEF_CALL(pgtable_t , pte_alloc_one, struct mm_struct *, unsigned long)
 #define pte_alloc_one(mm, address)	BTFIXUP_CALL(pte_alloc_one)(mm, address)
 BTFIXUPDEF_CALL(pte_t *, pte_alloc_one_kernel, struct mm_struct *, unsigned long)
 #define pte_alloc_one_kernel(mm, addr)	BTFIXUP_CALL(pte_alloc_one_kernel)(mm, addr)
@@ -61,7 +62,7 @@ BTFIXUPDEF_CALL(pte_t *, pte_alloc_one_kernel, struct mm_struct *, unsigned long
 BTFIXUPDEF_CALL(void, free_pte_fast, pte_t *)
 #define pte_free_kernel(mm, pte)	BTFIXUP_CALL(free_pte_fast)(pte)
 
-BTFIXUPDEF_CALL(void, pte_free, struct page *)
+BTFIXUPDEF_CALL(void, pte_free, pgtable_t )
 #define pte_free(mm, pte)	BTFIXUP_CALL(pte_free)(pte)
 #define __pte_free_tlb(tlb, pte)	pte_free((tlb)->mm, pte)
 
diff --git a/include/asm-sparc64/page.h b/include/asm-sparc64/page.h
index cdf950e017..e93a482aa2 100644
--- a/include/asm-sparc64/page.h
+++ b/include/asm-sparc64/page.h
@@ -104,6 +104,8 @@ typedef unsigned long pgprot_t;
 
 #endif /* (STRICT_MM_TYPECHECKS) */
 
+typedef struct page *pgtable_t;
+
 #define TASK_UNMAPPED_BASE	(test_thread_flag(TIF_32BIT) ? \
 				 (_AC(0x0000000070000000,UL)) : \
 				 (_AC(0xfffff80000000000,UL) + (1UL << 32UL)))
diff --git a/include/asm-sparc64/pgalloc.h b/include/asm-sparc64/pgalloc.h
index b48f73c227..3ee2d40637 100644
--- a/include/asm-sparc64/pgalloc.h
+++ b/include/asm-sparc64/pgalloc.h
@@ -43,11 +43,18 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 	return quicklist_alloc(0, GFP_KERNEL, NULL);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm,
-					 unsigned long address)
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
+					unsigned long address)
 {
-	void *pg = quicklist_alloc(0, GFP_KERNEL, NULL);
-	return pg ? virt_to_page(pg) : NULL;
+	struct page *page;
+	void *pg;
+
+	pg = quicklist_alloc(0, GFP_KERNEL, NULL);
+	if (!pg)
+		return NULL;
+	page = virt_to_page(pg);
+	pgtable_page_ctor(page);
+	return page;
 }
 		
 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
@@ -55,8 +62,9 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	quicklist_free(0, NULL, pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *ptepage)
+static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 {
+	pgtable_page_dtor(ptepage);
 	quicklist_free_page(0, NULL, ptepage);
 }
 
@@ -64,6 +72,7 @@ static inline void pte_free(struct mm_struct *mm, struct page *ptepage)
 #define pmd_populate_kernel(MM, PMD, PTE)	pmd_set(PMD, PTE)
 #define pmd_populate(MM,PMD,PTE_PAGE)		\
 	pmd_populate_kernel(MM,PMD,page_address(PTE_PAGE))
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 static inline void check_pgt_cache(void)
 {
diff --git a/include/asm-um/page.h b/include/asm-um/page.h
index fe2374d705..381f96b1c8 100644
--- a/include/asm-um/page.h
+++ b/include/asm-um/page.h
@@ -79,6 +79,8 @@ typedef unsigned long phys_t;
 
 typedef struct { unsigned long pgprot; } pgprot_t;
 
+typedef struct page *pgtable_t;
+
 #define pgd_val(x)	((x).pgd)
 #define pgprot_val(x)	((x).pgprot)
 
diff --git a/include/asm-um/pgalloc.h b/include/asm-um/pgalloc.h
index 4f3e62b028..9062a6e722 100644
--- a/include/asm-um/pgalloc.h
+++ b/include/asm-um/pgalloc.h
@@ -18,6 +18,7 @@
 	set_pmd(pmd, __pmd(_PAGE_TABLE +			\
 		((unsigned long long)page_to_pfn(pte) <<	\
 			(unsigned long long) PAGE_SHIFT)))
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * Allocate and free page tables.
@@ -26,19 +27,24 @@ extern pgd_t *pgd_alloc(struct mm_struct *);
 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 
 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
-extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
+extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
 
 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 {
 	free_page((unsigned long) pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *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) tlb_remove_page((tlb),(pte))
+#define __pte_free_tlb(tlb,pte)				\
+do {							\
+	pgtable_page_dtor(pte);				\
+	tlb_remove_page((tlb),(pte));			\
+} while (0)
 
 #ifdef CONFIG_3_LEVEL_PGTABLES
 
diff --git a/include/asm-x86/page_32.h b/include/asm-x86/page_32.h
index a6fd10f230..ba715d9798 100644
--- a/include/asm-x86/page_32.h
+++ b/include/asm-x86/page_32.h
@@ -50,6 +50,8 @@ typedef unsigned long	phys_addr_t;
 typedef union { pteval_t pte, pte_low; } pte_t;
 typedef pte_t boot_pte_t;
 
+typedef struct page *pgtable_t;
+
 #endif	/* __ASSEMBLY__ */
 #endif	/* CONFIG_X86_PAE */
 
diff --git a/include/asm-x86/page_64.h b/include/asm-x86/page_64.h
index dcf0c07460..f7393bc516 100644
--- a/include/asm-x86/page_64.h
+++ b/include/asm-x86/page_64.h
@@ -71,6 +71,8 @@ typedef unsigned long	pgdval_t;
 typedef unsigned long	pgprotval_t;
 typedef unsigned long	phys_addr_t;
 
+typedef struct page *pgtable_t;
+
 typedef struct { pteval_t pte; } pte_t;
 
 #define vmemmap ((struct page *)VMEMMAP_START)
diff --git a/include/asm-x86/pgalloc_32.h b/include/asm-x86/pgalloc_32.h
index bab12718a9..6bea6e5b5e 100644
--- a/include/asm-x86/pgalloc_32.h
+++ b/include/asm-x86/pgalloc_32.h
@@ -31,6 +31,7 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *p
 	paravirt_alloc_pt(mm, pfn);
 	set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 /*
  * Allocate and free page tables.
@@ -39,15 +40,16 @@ extern pgd_t *pgd_alloc(struct mm_struct *);
 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
 
 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
-extern struct page *pte_alloc_one(struct mm_struct *, unsigned long);
+extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
 
 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 {
 	free_page((unsigned long)pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *pte)
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 {
+	pgtable_page_dtor(pte);
 	__free_page(pte);
 }
 
diff --git a/include/asm-x86/pgalloc_64.h b/include/asm-x86/pgalloc_64.h
index 4f6220db22..8d6722320d 100644
--- a/include/asm-x86/pgalloc_64.h
+++ b/include/asm-x86/pgalloc_64.h
@@ -12,6 +12,8 @@
 #define pgd_populate(mm, pgd, pud) \
 		set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)))
 
+#define pmd_pgtable(pmd) pmd_page(pmd)
+
 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *pte)
 {
 	set_pmd(pmd, __pmd(_PAGE_TABLE | (page_to_pfn(pte) << PAGE_SHIFT)));
@@ -91,12 +93,17 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long ad
 	return (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm, unsigned long address)
+static inline pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
 {
-	void *p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
+	struct page *page;
+	void *p;
+
+	p = (void *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
 	if (!p)
 		return NULL;
-	return virt_to_page(p);
+	page = virt_to_page(p);
+	pgtable_page_ctor(page);
+	return page;
 }
 
 /* Should really implement gc for free page table pages. This could be
@@ -108,12 +115,17 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	free_page((unsigned long)pte); 
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *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) tlb_remove_page((tlb),(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))
diff --git a/include/asm-xtensa/page.h b/include/asm-xtensa/page.h
index 1adedbf41d..80a6ae0dd2 100644
--- a/include/asm-xtensa/page.h
+++ b/include/asm-xtensa/page.h
@@ -98,6 +98,7 @@
 typedef struct { unsigned long pte; } pte_t;		/* page table entry */
 typedef struct { unsigned long pgd; } pgd_t;		/* PGD table entry */
 typedef struct { unsigned long pgprot; } pgprot_t;
+typedef struct page *pgtable_t;
 
 #define pte_val(x)	((x).pte)
 #define pgd_val(x)	((x).pgd)
diff --git a/include/asm-xtensa/pgalloc.h b/include/asm-xtensa/pgalloc.h
index 1d51ba5463..8d1544eb46 100644
--- a/include/asm-xtensa/pgalloc.h
+++ b/include/asm-xtensa/pgalloc.h
@@ -24,6 +24,7 @@
 	(pmd_val(*(pmdp)) = ((unsigned long)ptep))
 #define pmd_populate(mm, pmdp, page)					     \
 	(pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 static inline pgd_t*
 pgd_alloc(struct mm_struct *mm)
@@ -46,10 +47,14 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 	return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT);
 }
 
-static inline struct page *pte_alloc_one(struct mm_struct *mm, 
-					 unsigned long addr)
+static inline pte_token_t pte_alloc_one(struct mm_struct *mm,
+					unsigned long addr)
 {
-	return virt_to_page(pte_alloc_one_kernel(mm, addr));
+	struct page *page;
+
+	page = virt_to_page(pte_alloc_one_kernel(mm, addr));
+	pgtable_page_ctor(page);
+	return page;
 }
 
 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
@@ -57,10 +62,12 @@ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 	kmem_cache_free(pgtable_cache, pte);
 }
 
-static inline void pte_free(struct mm_struct *mm, struct page *page)
+static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 {
-	kmem_cache_free(pgtable_cache, page_address(page));
+	pgtable_page_dtor(pte);
+	kmem_cache_free(pgtable_cache, page_address(pte));
 }
+#define pmd_pgtable(pmd) pmd_page(pmd)
 
 #endif /* __KERNEL__ */
 #endif /* _XTENSA_PGALLOC_H */
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 89d7c691b9..e8abb38142 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -894,6 +894,18 @@ static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long a
 #define pte_lockptr(mm, pmd)	({(void)(pmd); &(mm)->page_table_lock;})
 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */
 
+static inline void pgtable_page_ctor(struct page *page)
+{
+	pte_lock_init(page);
+	inc_zone_page_state(page, NR_PAGETABLE);
+}
+
+static inline void pgtable_page_dtor(struct page *page)
+{
+	pte_lock_deinit(page);
+	dec_zone_page_state(page, NR_PAGETABLE);
+}
+
 #define pte_offset_map_lock(mm, pmd, address, ptlp)	\
 ({							\
 	spinlock_t *__ptl = pte_lockptr(mm, pmd);	\
@@ -1136,7 +1148,7 @@ struct page *follow_page(struct vm_area_struct *, unsigned long address,
 #define FOLL_GET	0x04	/* do get_page on page */
 #define FOLL_ANON	0x08	/* give ZERO_PAGE if no pgtable */
 
-typedef int (*pte_fn_t)(pte_t *pte, struct page *pmd_page, unsigned long addr,
+typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
 			void *data);
 extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
 			       unsigned long size, pte_fn_t fn, void *data);
diff --git a/mm/memory.c b/mm/memory.c
index 153a54b201..e5628a5fd6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -134,11 +134,9 @@ void pmd_clear_bad(pmd_t *pmd)
  */
 static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd)
 {
-	struct page *page = pmd_page(*pmd);
+	pgtable_t token = pmd_pgtable(*pmd);
 	pmd_clear(pmd);
-	pte_lock_deinit(page);
-	pte_free_tlb(tlb, page);
-	dec_zone_page_state(page, NR_PAGETABLE);
+	pte_free_tlb(tlb, token);
 	tlb->mm->nr_ptes--;
 }
 
@@ -309,21 +307,19 @@ void free_pgtables(struct mmu_gather **tlb, struct vm_area_struct *vma,
 
 int __pte_alloc(struct mm_struct *mm, pmd_t *pmd, unsigned long address)
 {
-	struct page *new = pte_alloc_one(mm, address);
+	pgtable_t new = pte_alloc_one(mm, address);
 	if (!new)
 		return -ENOMEM;
 
-	pte_lock_init(new);
 	spin_lock(&mm->page_table_lock);
-	if (pmd_present(*pmd)) {	/* Another has populated it */
-		pte_lock_deinit(new);
-		pte_free(mm, new);
-	} else {
+	if (!pmd_present(*pmd)) {	/* Has another populated it ? */
 		mm->nr_ptes++;
-		inc_zone_page_state(new, NR_PAGETABLE);
 		pmd_populate(mm, pmd, new);
+		new = NULL;
 	}
 	spin_unlock(&mm->page_table_lock);
+	if (new)
+		pte_free(mm, new);
 	return 0;
 }
 
@@ -334,11 +330,13 @@ int __pte_alloc_kernel(pmd_t *pmd, unsigned long address)
 		return -ENOMEM;
 
 	spin_lock(&init_mm.page_table_lock);
-	if (pmd_present(*pmd))		/* Another has populated it */
-		pte_free_kernel(&init_mm, new);
-	else
+	if (!pmd_present(*pmd)) {	/* Has another populated it ? */
 		pmd_populate_kernel(&init_mm, pmd, new);
+		new = NULL;
+	}
 	spin_unlock(&init_mm.page_table_lock);
+	if (new)
+		pte_free_kernel(&init_mm, new);
 	return 0;
 }
 
@@ -1390,7 +1388,7 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
 {
 	pte_t *pte;
 	int err;
-	struct page *pmd_page;
+	pgtable_t token;
 	spinlock_t *uninitialized_var(ptl);
 
 	pte = (mm == &init_mm) ?
@@ -1401,10 +1399,10 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd,
 
 	BUG_ON(pmd_huge(*pmd));
 
-	pmd_page = pmd_page(*pmd);
+	token = pmd_pgtable(*pmd);
 
 	do {
-		err = fn(pte, pmd_page, addr, data);
+		err = fn(pte, token, addr, data);
 		if (err)
 			break;
 	} while (pte++, addr += PAGE_SIZE, addr != end);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 0536dde139..950c0be9ca 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -820,7 +820,7 @@ void  __attribute__((weak)) vmalloc_sync_all(void)
 }
 
 
-static int f(pte_t *pte, struct page *pmd_page, unsigned long addr, void *data)
+static int f(pte_t *pte, pgtable_t table, unsigned long addr, void *data)
 {
 	/* apply_to_page_range() does all the hard work. */
 	return 0;