mm/gup: update pin_user_pages.rst for "case 3" (mmu notifiers)

Update case 3 so that it covers the use of mmu notifiers, for hardware
that does, or does not have replayable page faults.

Also, elaborate case 4 slightly, as it was quite cryptic.

Signed-off-by: John Hubbard <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jérôme Glisse <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions