diff options
Diffstat (limited to 'mm/huge_memory.c')
| -rw-r--r-- | mm/huge_memory.c | 41 |
1 files changed, 5 insertions, 36 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 016b70ab5ed4..72fd53fe2b61 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1038,37 +1038,6 @@ unlock: spin_unlock(ptl); } -/* - * Save CONFIG_DEBUG_PAGEALLOC from faulting falsely on tail pages - * during copy_user_huge_page()'s copy_page_rep(): in the case when - * the source page gets split and a tail freed before copy completes. - * Called under pmd_lock of checked pmd, so safe from splitting itself. - */ -static void get_user_huge_page(struct page *page) -{ - if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC)) { - struct page *endpage = page + HPAGE_PMD_NR; - - atomic_add(HPAGE_PMD_NR, &page->_count); - while (++page < endpage) - get_huge_page_tail(page); - } else { - get_page(page); - } -} - -static void put_user_huge_page(struct page *page) -{ - if (IS_ENABLED(CONFIG_DEBUG_PAGEALLOC)) { - struct page *endpage = page + HPAGE_PMD_NR; - - while (page < endpage) - put_page(page++); - } else { - put_page(page); - } -} - static int do_huge_pmd_wp_page_fallback(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, @@ -1221,7 +1190,7 @@ int do_huge_pmd_wp_page(struct mm_struct *mm, struct vm_area_struct *vma, ret |= VM_FAULT_WRITE; goto out_unlock; } - get_user_huge_page(page); + get_page(page); spin_unlock(ptl); alloc: if (transparent_hugepage_enabled(vma) && @@ -1242,7 +1211,7 @@ alloc: split_huge_pmd(vma, pmd, address); ret |= VM_FAULT_FALLBACK; } - put_user_huge_page(page); + put_page(page); } count_vm_event(THP_FAULT_FALLBACK); goto out; @@ -1253,7 +1222,7 @@ alloc: put_page(new_page); if (page) { split_huge_pmd(vma, pmd, address); - put_user_huge_page(page); + put_page(page); } else split_huge_pmd(vma, pmd, address); ret |= VM_FAULT_FALLBACK; @@ -1275,7 +1244,7 @@ alloc: spin_lock(ptl); if (page) - put_user_huge_page(page); + put_page(page); if (unlikely(!pmd_same(*pmd, orig_pmd))) { spin_unlock(ptl); mem_cgroup_cancel_charge(new_page, memcg, true); @@ -1360,7 +1329,7 @@ struct page *follow_trans_huge_pmd(struct vm_area_struct *vma, page += (addr & ~HPAGE_PMD_MASK) >> PAGE_SHIFT; VM_BUG_ON_PAGE(!PageCompound(page), page); if (flags & FOLL_GET) - get_page_foll(page); + get_page(page); out: return page; |