linux-kernel - [RFC PATCH v2 0/2] locking/rwsem: Fix DEBUG_RWSEM warning from thaw

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Date:   Mon, 14 May 2018 15:31:05 -0400
From:   Waiman Long <longman@...hat.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        Davidlohr Bueso <dave@...olabs.net>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        Oleg Nesterov <oleg@...hat.com>,
        Amir Goldstein <amir73il@...il.com>, Jan Kara <jack@...e.cz>,
        Waiman Long <longman@...hat.com>
Subject: [RFC PATCH v2 0/2] locking/rwsem: Fix DEBUG_RWSEM warning from thaw_sup

My original patch (https://lkml.org/lkml/2018/4/4/447) to fix this isse 
probably won't work. This is my second attempt to fix it.

I don't have the setup to reproduce the problem. Could someone try it to see
if it can eliminate the warning?

Waiman Long (2):
  locking/rwsem: Add a new RWSEM_WRITER_OWNED_NOSPIN flag
  locking/percpu-rwsem: Mark rwsem as non-spinnable in
    percpu_rwsem_release()

 include/linux/percpu-rwsem.h |  6 +++---
 include/linux/rwsem.h        | 10 ++++++++++
 kernel/locking/rwsem-xadd.c  | 17 ++++++++---------
 kernel/locking/rwsem.c       | 16 +++++++++++++++-
 kernel/locking/rwsem.h       | 37 ++++++++++++++++++++++++++++++-------
 5 files changed, 66 insertions(+), 20 deletions(-)

-- 
1.8.3.1