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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>
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05fbf357d9
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0b1fbfe500
2 changed files with 2 additions and 13 deletions
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@ -1164,8 +1164,6 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
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/**
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/**
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* mm_walk - callbacks for walk_page_range
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* mm_walk - callbacks for walk_page_range
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* @pgd_entry: if set, called for each non-empty PGD (top-level) entry
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* @pud_entry: if set, called for each non-empty PUD (2nd-level) entry
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* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
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* @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry
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* this handler is required to be able to handle
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* this handler is required to be able to handle
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* pmd_trans_huge() pmds. They may simply choose to
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* pmd_trans_huge() pmds. They may simply choose to
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@ -1179,10 +1177,6 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *start_vma,
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* (see walk_page_range for more details)
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* (see walk_page_range for more details)
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*/
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*/
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struct mm_walk {
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struct mm_walk {
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int (*pgd_entry)(pgd_t *pgd, unsigned long addr,
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unsigned long next, struct mm_walk *walk);
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int (*pud_entry)(pud_t *pud, unsigned long addr,
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unsigned long next, struct mm_walk *walk);
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int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
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int (*pmd_entry)(pmd_t *pmd, unsigned long addr,
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unsigned long next, struct mm_walk *walk);
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unsigned long next, struct mm_walk *walk);
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int (*pte_entry)(pte_t *pte, unsigned long addr,
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int (*pte_entry)(pte_t *pte, unsigned long addr,
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@ -86,9 +86,7 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end,
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break;
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break;
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continue;
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continue;
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}
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}
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if (walk->pud_entry)
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if (walk->pmd_entry || walk->pte_entry)
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err = walk->pud_entry(pud, addr, next, walk);
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if (!err && (walk->pmd_entry || walk->pte_entry))
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err = walk_pmd_range(pud, addr, next, walk);
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err = walk_pmd_range(pud, addr, next, walk);
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if (err)
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if (err)
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break;
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break;
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@ -237,10 +235,7 @@ int walk_page_range(unsigned long addr, unsigned long end,
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pgd++;
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pgd++;
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continue;
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continue;
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}
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}
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if (walk->pgd_entry)
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if (walk->pmd_entry || walk->pte_entry)
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err = walk->pgd_entry(pgd, addr, next, walk);
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if (!err &&
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(walk->pud_entry || walk->pmd_entry || walk->pte_entry))
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err = walk_pud_range(pgd, addr, next, walk);
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err = walk_pud_range(pgd, addr, next, walk);
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if (err)
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if (err)
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break;
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break;
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