----- On Jan 16, 2018, at 2:22 PM, Mathieu Desnoyers mathieu.desnoyers@xxxxxxxxxxxx wrote: > ----- On Jan 16, 2018, at 1:29 PM, Thomas Gleixner tglx@xxxxxxxxxxxxx wrote: > >> On Mon, 15 Jan 2018, Mathieu Desnoyers wrote: >> >>> There are two places where core serialization is needed by membarrier: >>> >>> 1) When returning from the membarrier IPI, >>> 2) After scheduler updates curr to a thread with a different mm, before >>> going back to user-space, since the curr->mm is used by membarrier to >>> check whether it needs to send an IPI to that CPU. >> >> This wants to be split into x86 and core changes. Ideally you make the core >> changes before the previous patch and add the empty inline into >> linux/processor.h.... > > Good point, done. The first commit introducing the new command now also > introduces the generic stuff moved from the x86 patches. Scratch this: it's cleaner if I add a separate generic patch to introduce just the empty inline into linux/processor.h and the ARCH_HAS_SYNC_CORE_BEFORE_USERMODE in init/Kconfig. Thanks, Mathieu > > Thanks, > > Mathieu > >> >> Thanks, >> >> tglx > > -- > Mathieu Desnoyers > EfficiOS Inc. > http://www.efficios.com -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
