--- Michael Hennerich                                        2008-03-18 04:53:47

>seems to be bad interaction with doing the framebuffer ioctls and the mmap

No it's quite simple. It can be fixed by adding VM_SHARED to the fb mmap helper
function's vm_flags.
All our fb driver share the same problem.

-       vma->vm_flags |= VM_MAYSHARE;
+       vma->vm_flags |= VM_MAYSHARE | VM_SHARED;

The questions is do we really want this?
Are there any real world use cases?
Allowing two processes to write into the fb doesn't work well?

-Michael

 --- Mike Frysinger                                           2008-03-18 06:51:46
without the ioctls though, i could never get it to crash

all of our framebuffers should allow sharing of the memory ... this is expected
behavior in general, and there's no technical reason to disallow it that i know
of