linux-kernel - Re: [RFC GIT PULL rcu/next] RCU/hotplug fix

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Message-ID: <68a1c2b3-d23b-a1e7-b0f7-a182e6b170d1@codeaurora.org>
Date:   Wed, 23 Aug 2017 10:24:42 -0600
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Ingo Molnar <mingo@...nel.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     tglx@...utronix.de, bigeasy@...utronix.de,
        anna-maria@...utronix.de, boris.ostrovsky@...cle.com,
        richard@....at, linux-kernel@...r.kernel.org
Subject: Re: [RFC GIT PULL rcu/next] RCU/hotplug fix

On 8/15/2017 2:43 AM, Ingo Molnar wrote:
> 
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
>> Hello, Ingo,
>>
>> This pull request is for an RCU change that permits waiting for grace
>> periods started by CPUs late in the process of going offline.  Lack of
>> this capability is causing failures:
>>
>> http://lkml.kernel.org/r/db9c91f6-1b17-6136-84f0-03c3c2581ab4@codeaurora.org
>>
>> Although these failures predate v4.12, and thus are in some sense not
>> regressions, it would be good for them to be fixed sooner rather than
>> later, hence this RFC pull request.
>>
>> This commit was posted to LKML:
>>
>> 	http://lkml.kernel.org/r/1500933116-11642-2-git-send-email-paulmck@linux.vnet.ibm.com
>>
>> This commit has been exposed to 0day test robot and -next testing
>> and is available in the git repository at:
>>
>>    git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo
>>
>> for you to fetch changes up to a58163d8ca2c8d288ee9f95989712f98473a5ac2:
>>
>>    rcu: Migrate callbacks earlier in the CPU-offline timeline (2017-07-25 13:03:43 -0700)
>>
>> ----------------------------------------------------------------
>> Paul E. McKenney (1):
>>        rcu: Migrate callbacks earlier in the CPU-offline timeline
>>
>>   include/linux/rcupdate.h |   1 +
>>   kernel/cpu.c             |   1 +
>>   kernel/rcu/tree.c        | 209 +++++++++++++++++++++++++----------------------
>>   3 files changed, 115 insertions(+), 96 deletions(-)
> 
> Pulled, thanks Paul!
> 
> 	Ingo
> 

Ingo,

We've been keeping an eye on this fix, so I'm trying to ascertain it's 
status.  For my information, is this expected to hit Linus' tree in 
4.13, or wait until the 4.14 merge window?

Thanks

-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.