On 12/9/21 21:06, Waiman Long wrote:

Direct calls to local_irq_{save/restore}() and preempt_{enable/disable}()
are not appropriate for PREEMPT_RT. To provide better PREEMPT_RT support,
change local_irq_{save/restore}() to local_lock_irq{save/restore}() and
add a local_lock_t to struct memcg_stock_pcp.

Also disable the task and interrupt context optimization for obj_stock as
there will be no performance gain in the case of PREEMPT_RT. In this case,
task obj_stock will be there but remain unused.

Signed-off-by: Waiman Long <redacted>
---
  mm/memcontrol.c | 41 ++++++++++++++++++++++-------------------
  1 file changed, 22 insertions(+), 19 deletions(-)

Sorry, this doesn't apply to linux-next as it conflicts with a previous 
patch that I sent out. Will send out a v2 soon.

-Longman