linux-kernel - Re: [PATCH v2 tip/core/rcu 0/13] Sparse-related updates for 3.13

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Message-ID: <20131009224624.GG5790@linux.vnet.ibm.com>
Date:	Wed, 9 Oct 2013 15:46:24 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
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Subject: Re: [PATCH v2 tip/core/rcu 0/13] Sparse-related updates for 3.13

On Wed, Oct 09, 2013 at 03:18:05PM -0700, Josh Triplett wrote:
> On Wed, Oct 09, 2013 at 02:29:20PM -0700, Paul E. McKenney wrote:
> > Hello!
> > 
> > This series features updates to allow sparse to do a better job of
> > statically analyzing RCU usage:
> > 
> > 1.	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.
> > 
> > 2-13.	Apply rcu_access_pointer() to avoid a number of false positives.
> 
> I would suggest moving patch 1 to the end of the series, to avoid
> introducing and subsequently fixing warnings.

That would help with bisectability, will do!

							Thanx, Paul

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