s390/mm: Cleanup pXXp_flush_lazy() routines

Avoid unnecessary pgtable entry read in ptep_flush_lazy() and
pmdp_flush_lazy() routines. Use the already obtained value of
a pgtable entry instead of dereferencing it again.

It might appear that the optimized out second dereferencing happens
under mm_context_t::flush_count lock and therefore a race condition
is possible. However, both routines write invalid entry bits to the
pgtable entries and therefore no reader is allowed to interpret the
rest of the value afterwards.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

0 files changed, 0 insertions, 0 deletions