linux-kernel - Re: linux-next: manual merge of the rcu tree with the block tree

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Message-ID: <d4232318-0e44-445d-a7a3-1e2a018c824e@kernel.dk>
Date:   Fri, 12 Feb 2021 08:26:56 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     paulmck@...nel.org, Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>
Subject: Re: linux-next: manual merge of the rcu tree with the block tree

On 2/11/21 10:38 AM, Paul E. McKenney wrote:
> On Thu, Feb 11, 2021 at 04:48:52PM +1100, Stephen Rothwell wrote:
>> Hi all,
>>
>> Today's linux-next merge of the rcu tree got conflicts in:
>>
>>   include/linux/rcupdate.h
>>   kernel/rcu/tree.c
>>   kernel/rcu/tree_plugin.h
>>
>> between commits:
>>
>>   3a7b5c87a0b2 ("rcu/nocb: Perform deferred wake up before last idle's need_resched() check")
>>   e4234f21d2ea ("rcu: Pull deferred rcuog wake up to rcu_eqs_enter() callers")
>>   14bbd41d5109 ("entry/kvm: Explicitly flush pending rcuog wakeup before last rescheduling point")
> 
> Frederic had me move these out of the section of the -rcu commits for
> the v5.12 merge window, saying that they were not yet ready.
> 
> Jens, are these needed to prevent failures in the block tree?  If so,
> there were some commits added late in v5.11 that might also get rid
> of your failures.  If those v5.11 commits don't help the block tree,
> let's figure out what we need to do here...  ;-)

I pulled these in from sched/core looks like, because there was a dependency
for 2 block fixes from Sebastian:

https://git.kernel.dk/cgit/linux-block/log/?h=for-5.12/block-ipi

But I think I made a mistake in that it should've been sched/smp instead,
which would likely get rid of this issue too? I'll rebase it, it's just
a single topic branch with just those two patches on top.

-- 
Jens Axboe