From: Arnd Bergmann <arnd@arndb.de>
To: Josh Triplett <josh@joshtriplett.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
David Howells <dhowells@redhat.com>,
linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de,
peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu
Subject: Re: [PATCH tip/core/urgent 1/4] rcu: add rcu_access_pointer and rcu_dereference_protected
Date: Mon, 12 Apr 2010 22:30:42 +0200 [thread overview]
Message-ID: <201004122230.43053.arnd@arndb.de> (raw)
In-Reply-To: <20100412192441.GB27341@feather>
On Monday 12 April 2010 21:24:42 Josh Triplett wrote:
> If you want to prevent people from deferencing the pointer directly, or
> from assigning it to some other pointer, you could use Sparse's
> __attribute__((noderef)) and
> __attribute__((address_space(...)).
>
> See the definitions of __user and __iomem in include/linux/compiler.h
> for instance. (And, looking at that file, now __percpu. Nice!)
>
> You'd then have to explicitly use __force at the point where you
> legitimately dereference it.
I have started a patch set for doing that a few weeks ago, still need
to pick up that work again. Are there any other patches besides this
series that I should base on top of now?
Arnd
next prev parent reply other threads:[~2010-04-12 20:31 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-09 5:47 [PATCH tip/core/urgent] rcu: updates for RCU lockdep Paul E. McKenney
2010-04-09 5:47 ` [PATCH tip/core/urgent 1/4] rcu: add rcu_access_pointer and rcu_dereference_protected Paul E. McKenney
2010-04-09 9:10 ` David Howells
2010-04-09 9:24 ` Eric Dumazet
2010-04-09 16:57 ` Paul E. McKenney
2010-04-12 19:24 ` Josh Triplett
2010-04-12 20:30 ` Arnd Bergmann [this message]
2010-04-12 20:52 ` Paul E. McKenney
2010-04-09 16:56 ` Paul E. McKenney
2010-04-09 5:47 ` [PATCH tip/core/urgent 2/4] RCU: Better explain the condition parameter of rcu_dereference_check() Paul E. McKenney
2010-04-09 9:11 ` David Howells
2010-04-09 5:47 ` [PATCH tip/core/urgent 3/4] rcu: Update docs for rcu_access_pointer and rcu_dereference_protected Paul E. McKenney
2010-04-09 9:16 ` David Howells
2010-04-09 5:47 ` [PATCH tip/core/urgent 4/4] rcu: fix syntax error in rcu_dereference_check() example in comment Paul E. McKenney
2010-04-09 9:17 ` David Howells
2010-04-09 16:59 ` Paul E. McKenney
2010-04-09 8:59 ` [PATCH tip/core/urgent] rcu: updates for RCU lockdep Lai Jiangshan
2010-04-09 22:38 ` [PATCH tip/core/urgent] v2 " Paul E. McKenney
2010-04-09 22:39 ` [PATCH tip/core/urgent 1/3] rcu: add rcu_access_pointer and rcu_dereference_protected Paul E. McKenney
2010-04-10 6:03 ` Eric Dumazet
2010-04-10 8:13 ` David Howells
2010-04-14 15:00 ` [tip:core/urgent] rcu: Add " tip-bot for Paul E. McKenney
2010-04-09 22:39 ` [PATCH tip/core/urgent 2/3] RCU: Better explain the condition parameter of rcu_dereference_check() Paul E. McKenney
2010-04-14 15:01 ` [tip:core/urgent] rcu: " tip-bot for David Howells
2010-04-09 22:39 ` [PATCH tip/core/urgent 3/3] rcu: Update docs for rcu_access_pointer and rcu_dereference_protected Paul E. McKenney
2010-04-14 15:01 ` [tip:core/urgent] " tip-bot for Paul E. McKenney
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