On Sat, 2003-08-23 at 02:22, Hugh Dickins wrote:
> Good idea.  It's VM_MAYSHARE you need to check for.

OK, to get all this to work, there's a corner case in do_mremap() that I
need to be fixed:

When choosing the flags for the new area, it keys off VM_SHARED to
determine whether MAP_SHARED is passed to the mapping.  It has to key of
VM_MAYSHARE to preserve VM_MAYSHARE on the new mapping.

Patch below.

James