mm: drop page_check_address{,_transhuge}

All users are gone. Let's drop them.

Link: http://lkml.kernel.org/r/20170129173858.45174-12-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 138 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index 80525820aada..8774791e2809 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -708,144 +708,6 @@ out:
         return pmd;
 }
 
-/*
- * Check that @page is mapped at @address into @mm.
- *
- * If @sync is false, page_check_address may perform a racy check to avoid
- * the page table lock when the pte is not present (helpful when reclaiming
- * highly shared pages).
- *
- * On success returns with pte mapped and locked.
- */
-pte_t *__page_check_address(struct page *page, struct mm_struct *mm,
-                          unsigned long address, spinlock_t **ptlp, int sync)
-{
-        pmd_t *pmd;
-        pte_t *pte;
-        spinlock_t *ptl;
-
-        if (unlikely(PageHuge(page))) {
-                /* when pud is not present, pte will be NULL */
-                pte = huge_pte_offset(mm, address);
-                if (!pte)
-                        return NULL;
-
-                ptl = huge_pte_lockptr(page_hstate(page), mm, pte);
-                goto check;
-        }
-
-        pmd = mm_find_pmd(mm, address);
-        if (!pmd)
-                return NULL;
-
-        pte = pte_offset_map(pmd, address);
-        /* Make a quick check before getting the lock */
-        if (!sync && !pte_present(*pte)) {
-                pte_unmap(pte);
-                return NULL;
-        }
-
-        ptl = pte_lockptr(mm, pmd);
-check:
-        spin_lock(ptl);
-        if (pte_present(*pte) && page_to_pfn(page) == pte_pfn(*pte)) {
-                *ptlp = ptl;
-                return pte;
-        }
-        pte_unmap_unlock(pte, ptl);
-        return NULL;
-}
-
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-/*
- * Check that @page is mapped at @address into @mm. In contrast to
- * page_check_address(), this function can handle transparent huge pages.
- *
- * On success returns true with pte mapped and locked. For PMD-mapped
- * transparent huge pages *@ptep is set to NULL.
- */
-bool page_check_address_transhuge(struct page *page, struct mm_struct *mm,
-                                  unsigned long address, pmd_t **pmdp,
-                                  pte_t **ptep, spinlock_t **ptlp)
-{
-        pgd_t *pgd;
-        pud_t *pud;
-        pmd_t *pmd;
-        pte_t *pte;
-        spinlock_t *ptl;
-
-        if (unlikely(PageHuge(page))) {
-                /* when pud is not present, pte will be NULL */
-                pte = huge_pte_offset(mm, address);
-                if (!pte)
-                        return false;
-
-                ptl = huge_pte_lockptr(page_hstate(page), mm, pte);
-                pmd = NULL;
-                goto check_pte;
-        }
-
-        pgd = pgd_offset(mm, address);
-        if (!pgd_present(*pgd))
-                return false;
-        pud = pud_offset(pgd, address);
-        if (!pud_present(*pud))
-                return false;
-        pmd = pmd_offset(pud, address);
-
-        if (pmd_trans_huge(*pmd)) {
-                ptl = pmd_lock(mm, pmd);
-                if (!pmd_present(*pmd))
-                        goto unlock_pmd;
-                if (unlikely(!pmd_trans_huge(*pmd))) {
-                        spin_unlock(ptl);
-                        goto map_pte;
-                }
-
-                if (pmd_page(*pmd) != page)
-                        goto unlock_pmd;
-
-                pte = NULL;
-                goto found;
-unlock_pmd:
-                spin_unlock(ptl);
-                return false;
-        } else {
-                pmd_t pmde = *pmd;
-
-                barrier();
-                if (!pmd_present(pmde) || pmd_trans_huge(pmde))
-                        return false;
-        }
-map_pte:
-        pte = pte_offset_map(pmd, address);
-        if (!pte_present(*pte)) {
-                pte_unmap(pte);
-                return false;
-        }
-
-        ptl = pte_lockptr(mm, pmd);
-check_pte:
-        spin_lock(ptl);
-
-        if (!pte_present(*pte)) {
-                pte_unmap_unlock(pte, ptl);
-                return false;
-        }
-
-        /* THP can be referenced by any subpage */
-        if (pte_pfn(*pte) - page_to_pfn(page) >= hpage_nr_pages(page)) {
-                pte_unmap_unlock(pte, ptl);
-                return false;
-        }
-found:
-        *ptep = pte;
-        *pmdp = pmd;
-        *ptlp = ptl;
-        return true;
-}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
-
 struct page_referenced_arg {
         int mapcount;
         int referenced;