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Subject[PATCH 9/15] ptwalk: unmap_page_range
Convert unmap_page_range pagetable walkers to loops using p?d_addr_end.
Move blanking of irrelevant details up to unmap_page_range as Nick did.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
---
mm/memory.c | 119 ++++++++++++++++++++++++++----------------------------------
1 files changed, 53 insertions(+), 66 deletions(-)
--- ptwalk8/mm/memory.c 2005-03-09 01:37:15.000000000 +0000
+++ ptwalk9/mm/memory.c 2005-03-09 01:38:00.000000000 +0000
@@ -454,29 +454,22 @@ next_pgd:
return err;
}

-static void zap_pte_range(struct mmu_gather *tlb,
- pmd_t *pmd, unsigned long address,
- unsigned long size, struct zap_details *details)
+static void zap_pte_range(struct mmu_gather *tlb, pmd_t *pmd,
+ unsigned long addr, unsigned long end,
+ struct zap_details *details)
{
- unsigned long offset;
- pte_t *ptep;
+ pte_t *pte;

if (pmd_none_or_clear_bad(pmd))
return;
- ptep = pte_offset_map(pmd, address);
- offset = address & ~PMD_MASK;
- if (offset + size > PMD_SIZE)
- size = PMD_SIZE - offset;
- size &= PAGE_MASK;
- if (details && !details->check_mapping && !details->nonlinear_vma)
- details = NULL;
- for (offset=0; offset < size; ptep++, offset += PAGE_SIZE) {
- pte_t pte = *ptep;
- if (pte_none(pte))
+ pte = pte_offset_map(pmd, addr);
+ do {
+ pte_t ptent = *pte;
+ if (pte_none(ptent))
continue;
- if (pte_present(pte)) {
+ if (pte_present(ptent)) {
struct page *page = NULL;
- unsigned long pfn = pte_pfn(pte);
+ unsigned long pfn = pte_pfn(ptent);
if (pfn_valid(pfn)) {
page = pfn_to_page(pfn);
if (PageReserved(page))
@@ -500,20 +493,20 @@ static void zap_pte_range(struct mmu_gat
page->index > details->last_index))
continue;
}
- pte = ptep_get_and_clear(tlb->mm, address+offset, ptep);
- tlb_remove_tlb_entry(tlb, ptep, address+offset);
+ ptent = ptep_get_and_clear(tlb->mm, addr, pte);
+ tlb_remove_tlb_entry(tlb, pte, addr);
if (unlikely(!page))
continue;
if (unlikely(details) && details->nonlinear_vma
&& linear_page_index(details->nonlinear_vma,
- address+offset) != page->index)
- set_pte_at(tlb->mm, address+offset,
- ptep, pgoff_to_pte(page->index));
- if (pte_dirty(pte))
+ addr) != page->index)
+ set_pte_at(tlb->mm, addr, pte,
+ pgoff_to_pte(page->index));
+ if (pte_dirty(ptent))
set_page_dirty(page);
if (PageAnon(page))
tlb->mm->anon_rss--;
- else if (pte_young(pte))
+ else if (pte_young(ptent))
mark_page_accessed(page);
tlb->freed++;
page_remove_rmap(page);
@@ -526,68 +519,62 @@ static void zap_pte_range(struct mmu_gat
*/
if (unlikely(details))
continue;
- if (!pte_file(pte))
- free_swap_and_cache(pte_to_swp_entry(pte));
- pte_clear(tlb->mm, address+offset, ptep);
- }
- pte_unmap(ptep-1);
+ if (!pte_file(ptent))
+ free_swap_and_cache(pte_to_swp_entry(ptent));
+ pte_clear(tlb->mm, addr, pte);
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+ pte_unmap(pte - 1);
}

-static void zap_pmd_range(struct mmu_gather *tlb,
- pud_t *pud, unsigned long address,
- unsigned long size, struct zap_details *details)
+static void zap_pmd_range(struct mmu_gather *tlb, pud_t *pud,
+ unsigned long addr, unsigned long end,
+ struct zap_details *details)
{
- pmd_t * pmd;
- unsigned long end;
+ pmd_t *pmd;
+ unsigned long next;

if (pud_none_or_clear_bad(pud))
return;
- pmd = pmd_offset(pud, address);
- end = address + size;
- if (end > ((address + PUD_SIZE) & PUD_MASK))
- end = ((address + PUD_SIZE) & PUD_MASK);
+ pmd = pmd_offset(pud, addr);
do {
- zap_pte_range(tlb, pmd, address, end - address, details);
- address = (address + PMD_SIZE) & PMD_MASK;
- pmd++;
- } while (address && (address < end));
+ next = pmd_addr_end(addr, end);
+ zap_pte_range(tlb, pmd, addr, next, details);
+ } while (pmd++, addr = next, addr != end);
}

-static void zap_pud_range(struct mmu_gather *tlb,
- pgd_t * pgd, unsigned long address,
- unsigned long end, struct zap_details *details)
+static void zap_pud_range(struct mmu_gather *tlb, pgd_t *pgd,
+ unsigned long addr, unsigned long end,
+ struct zap_details *details)
{
- pud_t * pud;
+ pud_t *pud;
+ unsigned long next;

if (pgd_none_or_clear_bad(pgd))
return;
- pud = pud_offset(pgd, address);
+ pud = pud_offset(pgd, addr);
do {
- zap_pmd_range(tlb, pud, address, end - address, details);
- address = (address + PUD_SIZE) & PUD_MASK;
- pud++;
- } while (address && (address < end));
+ next = pud_addr_end(addr, end);
+ zap_pmd_range(tlb, pud, addr, next, details);
+ } while (pud++, addr = next, addr != end);
}

-static void unmap_page_range(struct mmu_gather *tlb,
- struct vm_area_struct *vma, unsigned long address,
- unsigned long end, struct zap_details *details)
+static void unmap_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
+ unsigned long addr, unsigned long end,
+ struct zap_details *details)
{
- unsigned long next;
pgd_t *pgd;
- int i;
+ unsigned long next;

- BUG_ON(address >= end);
- pgd = pgd_offset(vma->vm_mm, address);
+ if (details && !details->check_mapping && !details->nonlinear_vma)
+ details = NULL;
+
+ BUG_ON(addr >= end);
tlb_start_vma(tlb, vma);
- for (i = pgd_index(address); i <= pgd_index(end-1); i++) {
- next = (address + PGDIR_SIZE) & PGDIR_MASK;
- if (next <= address || next > end)
- next = end;
- zap_pud_range(tlb, pgd, address, next, details);
- address = next;
- pgd++;
- }
+ pgd = pgd_offset(vma->vm_mm, addr);
+ do {
+ next = pgd_addr_end(addr, end);
+ zap_pud_range(tlb, pgd, addr, next, details);
+ } while (pgd++, addr = next, addr != end);
tlb_end_vma(tlb, vma);
}

-
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