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| author |   Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-28 14:34:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-28 14:34:23 -0800 |
| commit | 6aab341e0a28aff100a09831c5300a2994b8b986 (patch) | |
| tree | 1af3908275aa5e1b16e80efee554a9a7504c56d4 /mm/mempolicy.c | |
| parent | [PATCH] drivers/scsi/dpt_i2o.c: fix a NULL pointer dereference (diff) | |
| download | linux-dev-6aab341e0a28aff100a09831c5300a2994b8b986.tar.xz linux-dev-6aab341e0a28aff100a09831c5300a2994b8b986.zip | |
mm: re-architect the VM_UNPAGED logic
This replaces the (in my opinion horrible) VM_UNMAPPED logic with very
explicit support for a "remapped page range" aka VM_PFNMAP. It allows a
VM area to contain an arbitrary range of page table entries that the VM
never touches, and never considers to be normal pages.
Any user of "remap_pfn_range()" automatically gets this new
functionality, and doesn't even have to mark the pages reserved or
indeed mark them any other way. It just works. As a side effect, doing
mmap() on /dev/mem works for arbitrary ranges.
Sparc update from David in the next commit.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 5609a31bdf22..bec88c81244e 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -189,17 +189,15 @@ static int check_pte_range(struct vm_area_struct *vma, pmd_t *pmd, orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); do { - unsigned long pfn; + struct page *page; unsigned int nid; if (!pte_present(*pte)) continue; - pfn = pte_pfn(*pte); - if (!pfn_valid(pfn)) { - print_bad_pte(vma, *pte, addr); + page = vm_normal_page(vma, addr, *pte); + if (!page) continue; - } - nid = pfn_to_nid(pfn); + nid = page_to_nid(page); if (!node_isset(nid, *nodes)) break; } while (pte++, addr += PAGE_SIZE, addr != end); @@ -269,8 +267,6 @@ check_range(struct mm_struct *mm, unsigned long start, unsigned long end, first = find_vma(mm, start); if (!first) return ERR_PTR(-EFAULT); - if (first->vm_flags & VM_UNPAGED) - return ERR_PTR(-EACCES); prev = NULL; for (vma = first; vma && vma->vm_start < end; vma = vma->vm_next) { if (!vma->vm_next && vma->vm_end < end) |