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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2015-02-11 23:27:34 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-12 01:06:05 (GMT)
commit0b1fbfe50006c41014cc25660c0e735d21c34939 (patch)
tree14c4d882894fdb12dbe7f0f34d01e595aa2b2fba /mm/pagewalk.c
parent05fbf357d94152171bc50f8a369390f1f16efd89 (diff)
downloadlinux-0b1fbfe50006c41014cc25660c0e735d21c34939.tar.xz
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>
Diffstat (limited to 'mm/pagewalk.c')
-rw-r--r--mm/pagewalk.c9
1 files changed, 2 insertions, 7 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index b264bda..b793ef1 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;