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Date: Wed, 11 Dec 2013 20:10:37 -0800
From: Josh Triplett <josh@...htriplett.org>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: linux-kernel@...r.kernel.org, mingo@...nel.org,
laijs@...fujitsu.com, dipankar@...ibm.com,
akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
darren@...art.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH v2 tip/core/rcu 0/4] Documentation changes for 3.14
On Wed, Dec 11, 2013 at 03:08:23PM -0800, Paul E. McKenney wrote:
> Hello!
>
> This series once again attempts to improve rcu_assign_pointer()'s
> relationship with sparse.
>
> 1. Add a comment indicating that despite appearances,
> rcu_assign_pointer() really only evaluates its arguments once,
> as a cpp macro should.
>
> 2. Replace rcu_assign_pointer() of NULL with RCU_INIT_POINTER() to
> silence a sparse warning.
>
> 3. Apply ACCESS_ONCE() to rcu_assign_pointer()'s target to prevent
> comiler mischief. Also require that the source pointer be from
> the kernel address space. Sometimes it can be from the RCU address
> space, which necessitates the remaining patches in this series.
> Which, it must be admitted, apply to a very small fraction of
> the rcu_assign_pointer() invocations in the kernel. This commit
> courtesy of Josh Triplett.
>
> 4. Add an RCU_INITIALIZER() for compile-time initialization of
> global RCU-protected pointers.
For all the patches (other than the one I wrote, for obvious reasons):
Reviewed-by: Josh Triplett <josh@...htriplett.org>
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