linux-kernel - Re: [RFC PATCH] rcu: Make 'rcu_assign_pointer(p, v)' of type 'typeof(p)'

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Date:   Thu, 23 May 2019 16:53:09 +0200
From:   Andrea Parri <andrea.parri@...rulasolutions.com>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Joel Fernandes <joel@...lfernandes.org>, rcu@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [RFC PATCH] rcu: Make 'rcu_assign_pointer(p, v)' of type
 'typeof(p)'

> > TBH, I'm not sure this is 'the right patch' (hence the RFC...): in
> > fact, I'm currently missing the motivations for allowing assignments
> > such as the "r0 = ..." assignment above in generic code.  (BTW, it's
> > not currently possible to use such assignments in litmus tests...)
> 
> Given that a quick (and perhaps error-prone) search of the uses of
> rcu_assign_pointer() in v5.1 didn't find a single use of the return
> value, let's please instead change the documentation and implementation
> to eliminate the return value.

Thanks for the confirmation, Paul; I'll prepare the new patch shortly...

  Andrea