Merge git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86

* git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86: (78 commits)
  x86: fix RTC lockdep warning: potential hardirq recursion
  x86: cpa, micro-optimization
  x86: cpa, clean up code flow
  x86: cpa, eliminate CPA_ enum
  x86: cpa, cleanups
  x86: implement gbpages support in change_page_attr()
  x86: support gbpages in pagetable dump
  x86: add gbpages support to lookup_address
  x86: add pgtable accessor functions for gbpages
  x86: add PUD_PAGE_SIZE
  x86: add feature macros for the gbpages cpuid bit
  x86: switch direct mapping setup over to set_pte
  x86: fix page-present check in cpa_flush_range
  x86: remove cpa warning
  x86: remove now unused clear_kernel_mapping
  x86: switch pci-gart over to using set_memory_np() instead of clear_kernel_mapping()
  x86: cpa selftest, skip non present entries
  x86: CPA fix pagetable split
  x86: rename LARGE_PAGE_SIZE to PMD_PAGE_SIZE
  x86: cpa, fix lookup_address
  ...

1 files changed, 20 insertions, 41 deletions

diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
index cb3aa47..c7db504 100644
--- a/arch/x86/mm/pgtable_32.c
+++ b/arch/x86/mm/pgtable_32.c
@@ -219,50 +219,39 @@ static inline void pgd_list_del(pgd_t *pgd)
 	list_del(&page->lru);
 }
 
+#define UNSHARED_PTRS_PER_PGD				\
+	(SHARED_KERNEL_PMD ? USER_PTRS_PER_PGD : PTRS_PER_PGD)
 
-
-#if (PTRS_PER_PMD == 1)
-/* Non-PAE pgd constructor */
-static void pgd_ctor(void *pgd)
+static void pgd_ctor(void *p)
 {
+	pgd_t *pgd = p;
 	unsigned long flags;
 
-	/* !PAE, no pagetable sharing */
+	/* Clear usermode parts of PGD */
 	memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t));
 
 	spin_lock_irqsave(&pgd_lock, flags);
 
-	/* must happen under lock */
-	clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD,
-			swapper_pg_dir + USER_PTRS_PER_PGD,
-			KERNEL_PGD_PTRS);
-	paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT,
-				__pa(swapper_pg_dir) >> PAGE_SHIFT,
-				USER_PTRS_PER_PGD,
-				KERNEL_PGD_PTRS);
-	pgd_list_add(pgd);
-	spin_unlock_irqrestore(&pgd_lock, flags);
-}
-#else  /* PTRS_PER_PMD > 1 */
-/* PAE pgd constructor */
-static void pgd_ctor(void *pgd)
-{
-	/* PAE, kernel PMD may be shared */
-
-	if (SHARED_KERNEL_PMD) {
-		clone_pgd_range((pgd_t *)pgd + USER_PTRS_PER_PGD,
+	/* If the pgd points to a shared pagetable level (either the
+	   ptes in non-PAE, or shared PMD in PAE), then just copy the
+	   references from swapper_pg_dir. */
+	if (PAGETABLE_LEVELS == 2 ||
+	    (PAGETABLE_LEVELS == 3 && SHARED_KERNEL_PMD)) {
+		clone_pgd_range(pgd + USER_PTRS_PER_PGD,
 				swapper_pg_dir + USER_PTRS_PER_PGD,
 				KERNEL_PGD_PTRS);
-	} else {
-		unsigned long flags;
+		paravirt_alloc_pd_clone(__pa(pgd) >> PAGE_SHIFT,
+					__pa(swapper_pg_dir) >> PAGE_SHIFT,
+					USER_PTRS_PER_PGD,
+					KERNEL_PGD_PTRS);
+	}
 
-		memset(pgd, 0, USER_PTRS_PER_PGD*sizeof(pgd_t));
-		spin_lock_irqsave(&pgd_lock, flags);
+	/* list required to sync kernel mapping updates */
+	if (!SHARED_KERNEL_PMD)
 		pgd_list_add(pgd);
-		spin_unlock_irqrestore(&pgd_lock, flags);
-	}
+
+	spin_unlock_irqrestore(&pgd_lock, flags);
 }
-#endif	/* PTRS_PER_PMD */
 
 static void pgd_dtor(void *pgd)
 {
@@ -276,9 +265,6 @@ static void pgd_dtor(void *pgd)
 	spin_unlock_irqrestore(&pgd_lock, flags);
 }
 
-#define UNSHARED_PTRS_PER_PGD				\
-	(SHARED_KERNEL_PMD ? USER_PTRS_PER_PGD : PTRS_PER_PGD)
-
 #ifdef CONFIG_X86_PAE
 /*
  * Mop up any pmd pages which may still be attached to the pgd.
@@ -387,13 +373,6 @@ void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
 
 void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
 {
-	/* This is called just after the pmd has been detached from
-	   the pgd, which requires a full tlb flush to be recognized
-	   by the CPU.  Rather than incurring multiple tlb flushes
-	   while the address space is being pulled down, make the tlb
-	   gathering machinery do a full flush when we're done. */
-	tlb->fullmm = 1;
-
 	paravirt_release_pd(__pa(pmd) >> PAGE_SHIFT);
 	tlb_remove_page(tlb, virt_to_page(pmd));
 }