Merge branch 'akpm' (fixes from Andrew)

[linux-drm-fsl-dcu.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index bf8665849a5fed0b93f6022670c7c571e7eea8c6..5d9025f3b3e1cd65bd97655ee95d6cd2f390ce5b 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -382,7 +382,7 @@ static void free_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
        pgtable_t token = pmd_pgtable(*pmd);
        pmd_clear(pmd);
        pte_free_tlb(tlb, token, addr);
-       tlb->mm->nr_ptes--;
+       atomic_long_dec(&tlb->mm->nr_ptes);
 }
 
 static inline void free_pmd_range(struct mmu_gather *tlb, pud_t *pud,
@@ -550,6 +550,7 @@ void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *vma,
 int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
                pmd_t *pmd, unsigned long address)
 {
+       spinlock_t *ptl;
        pgtable_t new = pte_alloc_one(mm, address);
        int wait_split_huge_page;
        if (!new)
@@ -570,15 +571,15 @@ int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
         */
        smp_wmb(); /* Could be smp_wmb__xxx(before|after)_spin_lock */
 
-       spin_lock(&mm->page_table_lock);
+       ptl = pmd_lock(mm, pmd);
        wait_split_huge_page = 0;
        if (likely(pmd_none(*pmd))) {   /* Has another populated it ? */
-               mm->nr_ptes++;
+               atomic_long_inc(&mm->nr_ptes);
                pmd_populate(mm, pmd, new);
                new = NULL;
        } else if (unlikely(pmd_trans_splitting(*pmd)))
                wait_split_huge_page = 1;
-       spin_unlock(&mm->page_table_lock);
+       spin_unlock(ptl);
        if (new)
                pte_free(mm, new);
        if (wait_split_huge_page)
@@ -1516,20 +1517,20 @@ struct page *follow_page_mask(struct vm_area_struct *vma,
                        split_huge_page_pmd(vma, address, pmd);
                        goto split_fallthrough;
                }
-               spin_lock(&mm->page_table_lock);
+               ptl = pmd_lock(mm, pmd);
                if (likely(pmd_trans_huge(*pmd))) {
                        if (unlikely(pmd_trans_splitting(*pmd))) {
-                               spin_unlock(&mm->page_table_lock);
+                               spin_unlock(ptl);
                                wait_split_huge_page(vma->anon_vma, pmd);
                        } else {
                                page = follow_trans_huge_pmd(vma, address,
                                                             pmd, flags);
-                               spin_unlock(&mm->page_table_lock);
+                               spin_unlock(ptl);
                                *page_mask = HPAGE_PMD_NR - 1;
                                goto out;
                        }
                } else
-                       spin_unlock(&mm->page_table_lock);
+                       spin_unlock(ptl);
                /* fall through */
        }
 split_fallthrough:
@@ -4269,3 +4270,21 @@ void copy_user_huge_page(struct page *dst, struct page *src,
        }
 }
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
+
+#if USE_SPLIT_PTE_PTLOCKS && BLOATED_SPINLOCKS
+bool ptlock_alloc(struct page *page)
+{
+       spinlock_t *ptl;
+
+       ptl = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
+       if (!ptl)
+               return false;
+       page->ptl = ptl;
+       return true;
+}
+
+void ptlock_free(struct page *page)
+{
+       kfree(page->ptl);
+}
+#endif