linux-kernel - Re: [PATCH 2/3] refcount: introduce __refcount_dec_and

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Message-ID: <20231109093152.GS8262@noisy.programming.kicks-ass.net>
Date:   Thu, 9 Nov 2023 10:31:52 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexander Aring <aahringo@...hat.com>
Cc:     will@...nel.org, gfs2@...ts.linux.dev, boqun.feng@...il.com,
        mark.rutland@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] refcount: introduce __refcount_dec_and_lock macro

On Mon, Nov 06, 2023 at 02:11:37PM -0500, Alexander Aring wrote:
> This patch adds the __refcount_dec_and_lock macro to generate code for a
> lock specific refcount_dec_and_lock implementation. Existing
> refcount_dec_and_lock implementation are updated to use the new
> __refcount_dec_and_lock macro. In future other lock implementation can
> added to use the refcount_dec_and_lock trick to only hold the lock when
> the refcount is going to be zero. Per subsystem own lock implementation
> can use the macro as well to provide such implementation for their own
> locking type.
> 
> Co-developed: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Alexander Aring <aahringo@...hat.com>

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>