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Date: Thu, 13 Nov 2008 09:19:45 -0800
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Andrew Morton <akpm@...ux-foundation.org>
CC: Nick Piggin <nickpiggin@...oo.com.au>,
Linux Memory Management List <linux-mm@...ck.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Subject: [PATCH 1/2] mm: implement remap_pfn_range with apply_to_page_range
remap_pte_range() just wants to apply a function over a range of ptes
corresponding to a virtual address range. That's exactly what
apply_to_page_range() does, so use it.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
mm/memory.c | 92 ++++++++++++-----------------------------------------------
1 file changed, 20 insertions(+), 72 deletions(-)
===================================================================
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1472,69 +1472,20 @@
}
EXPORT_SYMBOL(vm_insert_mixed);
-/*
- * maps a range of physical memory into the requested pages. the old
- * mappings are removed. any references to nonexistent pages results
- * in null mappings (currently treated as "copy-on-access")
- */
-static int remap_pte_range(struct mm_struct *mm, pmd_t *pmd,
- unsigned long addr, unsigned long end,
- unsigned long pfn, pgprot_t prot)
+struct remap_data {
+ struct mm_struct *mm;
+ unsigned long pfn;
+ pgprot_t prot;
+};
+
+static int remap_area_pte_fn(pte_t *ptep, pgtable_t token,
+ unsigned long addr, void *data)
{
- pte_t *pte;
- spinlock_t *ptl;
+ struct remap_data *rmd = data;
+ pte_t pte = pte_mkspecial(pfn_pte(rmd->pfn++, rmd->prot));
- pte = pte_alloc_map_lock(mm, pmd, addr, &ptl);
- if (!pte)
- return -ENOMEM;
- arch_enter_lazy_mmu_mode();
- do {
- BUG_ON(!pte_none(*pte));
- set_pte_at(mm, addr, pte, pte_mkspecial(pfn_pte(pfn, prot)));
- pfn++;
- } while (pte++, addr += PAGE_SIZE, addr != end);
- arch_leave_lazy_mmu_mode();
- pte_unmap_unlock(pte - 1, ptl);
- return 0;
-}
+ set_pte_at(rmd->mm, addr, ptep, pte);
-static inline int remap_pmd_range(struct mm_struct *mm, pud_t *pud,
- unsigned long addr, unsigned long end,
- unsigned long pfn, pgprot_t prot)
-{
- pmd_t *pmd;
- unsigned long next;
-
- pfn -= addr >> PAGE_SHIFT;
- pmd = pmd_alloc(mm, pud, addr);
- if (!pmd)
- return -ENOMEM;
- do {
- next = pmd_addr_end(addr, end);
- if (remap_pte_range(mm, pmd, addr, next,
- pfn + (addr >> PAGE_SHIFT), prot))
- return -ENOMEM;
- } while (pmd++, addr = next, addr != end);
- return 0;
-}
-
-static inline int remap_pud_range(struct mm_struct *mm, pgd_t *pgd,
- unsigned long addr, unsigned long end,
- unsigned long pfn, pgprot_t prot)
-{
- pud_t *pud;
- unsigned long next;
-
- pfn -= addr >> PAGE_SHIFT;
- pud = pud_alloc(mm, pgd, addr);
- if (!pud)
- return -ENOMEM;
- do {
- next = pud_addr_end(addr, end);
- if (remap_pmd_range(mm, pud, addr, next,
- pfn + (addr >> PAGE_SHIFT), prot))
- return -ENOMEM;
- } while (pud++, addr = next, addr != end);
return 0;
}
@@ -1551,10 +1502,9 @@
int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn, unsigned long size, pgprot_t prot)
{
- pgd_t *pgd;
- unsigned long next;
unsigned long end = addr + PAGE_ALIGN(size);
struct mm_struct *mm = vma->vm_mm;
+ struct remap_data rmd;
int err;
/*
@@ -1584,16 +1534,14 @@
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
BUG_ON(addr >= end);
- pfn -= addr >> PAGE_SHIFT;
- pgd = pgd_offset(mm, addr);
- flush_cache_range(vma, addr, end);
- do {
- next = pgd_addr_end(addr, end);
- err = remap_pud_range(mm, pgd, addr, next,
- pfn + (addr >> PAGE_SHIFT), prot);
- if (err)
- break;
- } while (pgd++, addr = next, addr != end);
+
+ rmd.mm = mm;
+ rmd.pfn = pfn;
+ rmd.prot = prot;
+
+ err = apply_to_page_range(mm, addr, end - addr,
+ remap_area_pte_fn, &rmd);
+
return err;
}
EXPORT_SYMBOL(remap_pfn_range);
--
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