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| author | Linus Torvalds <torvalds@g5.osdl.org> | 2005-12-16 10:21:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-12-16 10:21:23 -0800 |
| commit | 4d7672b46244abffea1953e55688c0ea143dd617 (patch) | |
| tree | 9f3bdf438bcb0d5f6e723665ced23308fffb8368 /mm/mmap.c | |
| parent | 281ab031a8c9e5b593142eb4ec59a87faae8676a (diff) | |
| download | lwn-4d7672b46244abffea1953e55688c0ea143dd617.tar.gz lwn-4d7672b46244abffea1953e55688c0ea143dd617.zip | |
Make sure we copy pages inserted with "vm_insert_page()" on fork
The logic that decides that a fork() might be able to avoid copying a VM
area when it can be re-created by page faults didn't know about the new
vm_insert_page() case.
Also make some things a bit more anal wrt VM_PFNMAP.
Pointed out by Hugh Dickins <hugh@veritas.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 11ca5927d5ff..64ba4dbcb7de 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -611,7 +611,7 @@ again: remove_next = 1 + (end > next->vm_end); * If the vma has a ->close operation then the driver probably needs to release * per-vma resources, so we don't attempt to merge those. */ -#define VM_SPECIAL (VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_RESERVED) +#define VM_SPECIAL (VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP) static inline int is_mergeable_vma(struct vm_area_struct *vma, struct file *file, unsigned long vm_flags) |