mm: wrap calls to set_pte_at_notify with invalidate_range_start and invalidate_range_end

In order to allow sleeping during invalidate_page mmu notifier calls, we
need to avoid calling when holding the PT lock.  In addition to its direct
calls, invalidate_page can also be called as a substitute for a change_pte
call, in case the notifier client hasn't implemented change_pte.

This patch drops the invalidate_page call from change_pte, and instead
wraps all calls to change_pte with invalidate_range_start and
invalidate_range_end calls.

Note that change_pte still cannot sleep after this patch, and that clients
implementing change_pte should not take action on it in case the number of
outstanding invalidate_range_start calls is larger than one, otherwise
they might miss a later invalidation.

Signed-off-by: Haggai Eran <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: Sagi Grimberg <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Xiao Guangrong <[email protected]>
Cc: Or Gerlitz <[email protected]>
Cc: Haggai Eran <[email protected]>
Cc: Shachar Raindel <[email protected]>
Cc: Liran Liss <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Avi Kivity <[email protected]>
Cc: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions