[PATCH 0/2] sched: finish_switch_mm hook

[Martin Schwidefsky]

Hi,

in order to implement TLB flushing on s390 in a way that is 100%
compliant with the architecture I would like to introcude a new
hook to the scheduler. In concept it pairs with the switch_mm
function and is called after all locks have been released to
complete the switch_mm operation. The use case for s390 boils
down to the ability to wait for another CPU in switch_mm/
finish_switch_mm.

Right now the issue is theoretical and can only show up under
a extreme race condition in combination with a buggy user space
program. But to implement local TLB flushing which has been
added to the latest machine (zEC12) the finish_switch_mm hook
will be needed.

Patch #2 of the series is included as reference and shows how the
finish_switch_mm hook would be used in s390 code. The description
of the patch has more details why the hook is needed.

-- 
1.7.9.5

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