linux-kernel - Re: [PATCH v2 tip/core/rcu 0/4] Documentation changes for 3.14

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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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