linux-kernel - Re: [PATCH 0/2] Fix boot regression for s390 and remove break

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Date:   Mon, 11 Dec 2017 15:02:51 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Will Deacon <will.deacon@....com>
Cc:     Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-kernel@...r.kernel.org, sebott@...ux.vnet.ibm.com,
        schwidefsky@...ibm.com, peterz@...radead.org
Subject: Re: [PATCH 0/2] Fix boot regression for s390 and remove break_lock


* Will Deacon <will.deacon@....com> wrote:

> On Sat, Dec 02, 2017 at 10:02:08AM +0100, Heiko Carstens wrote:
> > On Tue, Nov 28, 2017 at 06:42:17PM +0000, Will Deacon wrote:
> > > The following two patches do the following:
> > > 
> > >   1. Fix boot breakage reported on s390 caused by a8a217c22116
> > >   2. Kill off the break_lock field entirely, since it's not actually
> > >      that useful
> > > 
> > > I didn't go the whole hog and remove CONFIG_GENERIC_LOCKBREAK, since the
> > > "do something different with locks in preemptible kernels" isn't necessarily
> > > a bad idea, and PowerPC actually implements things like arch_spin_relax
> > > for that.
> > > 
> > > The first patch should go in to 4.15.
> > > 
> > > Thanks,
> > > 
> > > Will
> > > 
> > > --->8
> > > 
> > > Will Deacon (2):
> > >   locking/core: Fix deadlock during boot on systems with
> > >     GENERIC_LOCKBREAK
> > >   locking/core: Remove break_lock field when CONFIG_GENERIC_LOCKBREAK=y
> > > 
> > >  include/linux/rwlock_types.h   |  3 ---
> > >  include/linux/spinlock.h       |  5 -----
> > >  include/linux/spinlock_types.h |  3 ---
> > >  kernel/locking/spinlock.c      | 13 +++----------
> > >  4 files changed, 3 insertions(+), 21 deletions(-)
> > 
> > *ping* ... these patches haven't been picked up yet as far as I can tell.
> > Peter, Ingo?
> 
> Damn, this first patch didn't appear in -rc3.
> 
> Ingo -- please can you pick this up? Without it, s390 doesn't boot with
> mainline.

Applied now, and will get it to Linus ASAP, sorry about that!

Thanks,

	Ingo