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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/madvise.c | |
| parent | 458af5439fe7ae7d95ca14106844e61f0795166c (diff) | |
| download | lwn-6aab341e0a28aff100a09831c5300a2994b8b986.tar.gz lwn-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/madvise.c')
| -rw-r--r-- | mm/madvise.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index 328a3bcce527..2b7cf0400a21 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -126,7 +126,7 @@ static long madvise_dontneed(struct vm_area_struct * vma, unsigned long start, unsigned long end) { *prev = vma; - if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_UNPAGED)) + if (vma->vm_flags & (VM_LOCKED|VM_HUGETLB|VM_PFNMAP)) return -EINVAL; if (unlikely(vma->vm_flags & VM_NONLINEAR)) { |