linux-kernel - Re: [patch V2 0/7] fs: Substitute bit-spinlocks for PREEMPT

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Message-ID: <20190820171640.elgrbetjivvk7zti@linutronix.de>
Date:   Tue, 20 Aug 2019 19:16:40 +0200
From:   Sebastian Siewior <bigeasy@...utronix.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Julia Cartwright <julia@...com>, Jan Kara <jack@...e.cz>,
        Theodore Tso <tytso@....edu>,
        Matthew Wilcox <willy@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        Jan Kara <jack@...e.com>, Mark Fasheh <mark@...heh.com>,
        Joseph Qi <joseph.qi@...ux.alibaba.com>,
        Joel Becker <jlbec@...lplan.org>
Subject: Re: [patch V2 0/7] fs: Substitute bit-spinlocks for PREEMPT_RT and
 debugging

On 2019-08-10 01:18:34 [-0700], Christoph Hellwig wrote:
> > > Does SLUB work on -rt at all?
> > 
> > It's the only allocator we support with a few tweaks :)
> 
> What do you do about this particular piece of code there?

This part remains untouched. This "lock" is acquired within ->list_lock
which is a raw_spinlock_t and disables preemption/interrupts on -RT.

Sebastian