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

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Message-ID: <ZxdQiLhn16FtkOys@infradead.org>
Date: Tue, 22 Oct 2024 00:13:12 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Christoph Hellwig <hch@...radead.org>,
	"Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-team@...a.com,
	rostedt@...dmis.org, andrii@...nel.org
Subject: Re: [PATCH rcu] srcu: Guarantee non-negative return value from
 srcu_read_lock()

On Tue, Oct 22, 2024 at 09:10:18AM +0200, Peter Zijlstra wrote:
> Ah, well, the thing that got us here is that we (Andrii and me) wanted
> to use -1 as an 'invalid' value to indicate SRCU is not currently in
> use.
> 
> So it all being int is really rather convenient :-)

Then please document that use.  Maybe even with a symolic name for
-1 that clearly describes these uses.