[PATCH] Unaccount VM_DONTCOPY vmas properly

[PATCH] Unaccount VM_DONTCOPY vmas properly

Unaccount VM_DONTCOPY vmas properly; the child inherits the whole of the
parent's virtual accounting from the memcpy() in copy_mm(), but the
VM_DONTCOPY check here is where a decision is made for the child not to
inherit the vmas corresponding to some accounted memory usages.  Hence,
unaccount them when skipping over them here.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>