Add a whole bunch more might_sleep() checks.  We also enable might_sleep()
checking in copy_*_user().  This was non-trivial because of the "copy_*_user()
in atomic regions" trick would generate false positives.  Fix that up by
adding a new __copy_*_user_inatomic(), which avoids the might_sleep() check.

Only i386 is supported in this patch.

With: Arjan van de Ven <arjanv@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>