Re: [PATCH for 4.16 08/10] membarrier: x86: Provide core serializing command (v3)

[Mathieu Desnoyers]

----- 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