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

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Date:   Tue, 28 Nov 2017 18:42:17 +0000
From:   Will Deacon <will.deacon@....com>
To:     linux-kernel@...r.kernel.org
Cc:     sebott@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, peterz@...radead.org, mingo@...nel.org,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 0/2] Fix boot regression for s390 and remove break_lock

Hi all,

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(-)

-- 
2.1.4