linux-kernel - Re: [PATCH 0.5/5] alpha: remove custom dec_and

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Date:   Wed, 6 Jun 2018 13:21:39 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de,
        Ingo Molnar <mingo@...hat.com>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>, linux-alpha@...r.kernel.org
Subject: Re: [PATCH 0.5/5] alpha: remove custom dec_and_lock() implementation

On 2018-06-06 13:18:50 [+0200], To Peter Zijlstra wrote:
> I suggest to remove the custom alpha implementation of dec_and_lock()
> and if it is an issue (performance wise) we could still inline the fast
> path of dec_and_lock().

For everyone who lost track, we are now down to this:
|577cd5e894ec alpha: remove custom dec_and_lock() implementation
|831923bd9fd3 spinlock: atomic_dec_and_lock: Add an irqsave variant
|f452abc5a3c1 drivers/md/raid5: Use irqsave variant of atomic_dec_and_lock()
|8e609dcd8b0d drivers/md/raid5: Do not disable irq on release_inactive_stripe_list() call
|fdf84cf5bee4 bdi: use refcount_t for reference counting instead atomic_t
|c3fce80b4112 userns: use refcount_t for reference counting instead atomic_t
|a9595ca33f5b locking/refcount: implement refcount_dec_and_lock_irqsave()
|32ded25a41a9 bdi: Use irqsave variant of refcount_dec_and_lock()
|6a63e34ed625 userns: Use irqsave variant of refcount_dec_and_lock()

for reference at
  https://git.kernel.org/pub/scm/linux/kernel/git/bigeasy/staging.git/log/?h=refcount_t_irqsave

Sebastian