mm/pagewalk: remove pgd_entry() and pud_entry()

Currently no user of page table walker sets ->pgd_entry() or
->pud_entry(), so checking their existence in each loop is just wasting
CPU cycle.  So let's remove it to reduce overhead.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 7 deletions

diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index b264bda46e1b..b793ef149da2 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -86,9 +86,7 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
                                 break;
                         continue;
                 }
-                if (walk->pud_entry)
-                        err = walk->pud_entry(pud, addr, next, walk);
-                if (!err && (walk->pmd_entry || walk->pte_entry))
+                if (walk->pmd_entry || walk->pte_entry)
                         err = walk_pmd_range(pud, addr, next, walk);
                 if (err)
                         break;
@@ -237,10 +235,7 @@ int walk_page_range(unsigned long addr, unsigned long end,
                         pgd++;
                         continue;
                 }
-                if (walk->pgd_entry)
-                        err = walk->pgd_entry(pgd, addr, next, walk);
-                if (!err &&
-                    (walk->pud_entry || walk->pmd_entry || walk->pte_entry))
+                if (walk->pmd_entry || walk->pte_entry)
                         err = walk_pud_range(pgd, addr, next, walk);
                 if (err)
                         break;