linux-kernel - [RFC 0/3] sparse: Introduce __private to privatize members of structs

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Date:	Sat, 12 Dec 2015 10:55:59 +0800
From:	Boqun Feng <boqun.feng@...il.com>
To:	linux-sparse@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Christopher Li <sparse@...isli.org>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Josh Triplett <josh@...htriplett.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Andy Whitcroft <apw@...onical.com>,
	Joe Perches <joe@...ches.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Brian Norris <computersforpeace@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Boqun Feng <boqun.feng@...il.com>
Subject: [RFC 0/3] sparse: Introduce __private to privatize members of structs

Hi all,

As I proposed:

http://marc.info/?l=linux-arm-kernel&m=144944469805753

, we can define a __private modifier for sparse to detect misuses of private
members of structs. This could make maintenace a little easier and prevent some
potential bugs.

This patchset serves as a POC and consists of three patches:

1.	Introduce __private and related macro, also improve compiler.h a litte
	bit

2.	Privatize rcu_node::lock

3.	Privatize irq_common_data::state_use_accessors

This patchset is against

	-rcu/rcu/next	5f343fc7f0ce7edfe344e7cc5afdfe145a18f802

because this depends on commits:
	
	"rcu: Create transitive rnp->lock acquisition functions"

and

	"rcu: Add transitivity to remaining rcu_node ->lock acquisitions


I tried to use 0day to test this, but seems the email transfer from 0day to my
mail box is very slow recently, so I haven't received a recent result yet. But
as one can see, this patchset doesn't have any functional modification, the 0day
may not find anything interesting ;-)


Looking forward to any suggestion, question and comment ;-)

Regards,
Boqun
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