linux-kernel - Re: [PATCH 0/3] sched/swait: Convert to full exclusive mode

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Message-Id: <20180614012742.GP3593@linux.vnet.ibm.com>
Date:   Wed, 13 Jun 2018 18:27:42 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, tglx@...utronix.de,
        bigeasy@...utronix.de, oleg@...hat.com, pbonzini@...hat.com
Subject: Re: [PATCH 0/3] sched/swait: Convert to full exclusive mode

On Tue, Jun 12, 2018 at 10:34:49AM +0200, Peter Zijlstra wrote:
> As mentioned by Linus, swait is exclusive mode and had better behave like it
> and be named like it.
> 
> Make it so.

Cool!

When I tried testing it on x86 against recent mainline, I got:

"WARNING: WARNING: Bad or missing .orc_unwind table.  Disabling unwinder."

But when I tested on recent mainline without your patches:

	4597fcff0704 "Merge tag 'for-4.18/dm-changes-v2' of
	git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm"

I get the same warning.  Trying again on today's mainline, but in the
meantime, is anyone else seeing this?

							Thanx, Paul

> ---
>  arch/mips/kvm/mips.c         |  4 ++--
>  arch/powerpc/kvm/book3s_hv.c |  6 +++---
>  arch/s390/kvm/interrupt.c    |  2 +-
>  arch/x86/kernel/kvm.c        |  4 ++--
>  arch/x86/kvm/lapic.c         |  2 +-
>  include/linux/swait.h        | 36 ++++++++++++++++++------------------
>  kernel/power/suspend.c       |  4 ++--
>  kernel/rcu/srcutiny.c        |  4 ++--
>  kernel/rcu/tree.c            |  8 ++++----
>  kernel/rcu/tree_exp.h        |  4 ++--
>  kernel/rcu/tree_plugin.h     | 12 ++++++------
>  kernel/sched/swait.c         | 32 ++++++++++++++++++++++----------
>  virt/kvm/arm/arm.c           |  4 ++--
>  virt/kvm/arm/psci.c          |  2 +-
>  virt/kvm/async_pf.c          |  2 +-
>  virt/kvm/kvm_main.c          |  4 ++--
>  16 files changed, 71 insertions(+), 59 deletions(-)
> 
>