linux-kernel - Re: [PATCH rcu] srcu: Guarantee non-negative return value from srcu_read

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Message-ID: <ZxdLfLWWrAEfRiXV@infradead.org>
Date: Mon, 21 Oct 2024 23:51:40 -0700
From: Christoph Hellwig <hch@...radead.org>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: rcu@...r.kernel.org, linux-kernel@...r.kernel.org, kernel-team@...a.com,
	rostedt@...dmis.org, peterz@...radead.org, andrii@...nel.org
Subject: Re: [PATCH rcu] srcu: Guarantee non-negative return value from
 srcu_read_lock()

On Mon, Oct 21, 2024 at 03:13:05PM -0700, Paul E. McKenney wrote:
> For almost 20 years, the int return value from srcu_read_lock() has
> been always either zero or one.  This commit therefore documents the
> fact that it will be non-negative.

If it is always zero or one, wouldn't bool the better return value
type?