From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Stephen Hemminger <shemminger@linux-foundation.org>,
linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, dvhltc@us.ibm.com, niv@us.ibm.com,
tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu, dhowells@redhat.com,
eric.dumazet@gmail.com, David Miller <davem@davemloft.net>
Subject: Re: [PATCH tip/core/rcu 28/48] net: Make accesses to ->br_port safe for sparse RCU
Date: Wed, 5 May 2010 15:03:55 -0700 [thread overview]
Message-ID: <20100505220355.GA20938@linux.vnet.ibm.com> (raw)
In-Reply-To: <201005042341.49480.arnd@arndb.de>
On Tue, May 04, 2010 at 11:41:49PM +0200, Arnd Bergmann wrote:
> On Tuesday 04 May 2010 23:26:31 Stephen Hemminger wrote:
> > > The new versions of the rcu_dereference() APIs requires that any pointers
> > > passed to one of these APIs be fully defined. The ->br_port field
> > > in struct net_device points to a struct net_bridge_port, which is an
> > > incomplete type. This commit therefore changes ->br_port to be a void*,
> > > and introduces a br_port() helper function to convert the type to struct
> > > net_bridge_port, and applies this new helper function where required.
> >
> > I would rather make the bridge hook generic and not take a type argument.
>
> Not sure if you were confused by the comment in the same way that I was.
>
> The bridge hook is not impacted by this at all, since we can either pass
> a void* or a struct net_bridge_port* to it. The br_port() helper
> is used for all the places where we actually want to dereference
> dev->br_port and access its contents.
What should I change in the commit message to clear this up?
Of course, if the code needs to change, please let me know what should
change there as well.
Thanx, Paul
next prev parent reply other threads:[~2010-05-05 22:04 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-04 20:19 [PATCH tip/core/rcu 0/48] v4 patches queued for 2.6.35 Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 01/48] rcu: optionally leave lockdep enabled after RCU lockdep splat Paul E. McKenney
2010-05-05 22:46 ` Mathieu Desnoyers
2010-05-05 23:05 ` Paul E. McKenney
2010-05-05 23:24 ` Mathieu Desnoyers
2010-05-05 23:36 ` Paul E. McKenney
2010-05-06 2:05 ` Mathieu Desnoyers
2010-05-06 23:09 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 02/48] rcu: substitute set_need_resched for sending resched IPIs Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 03/48] rcu: make dead code really dead Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 04/48] rcu: move some code from macro to function Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 05/48] rcu: ignore offline CPUs in last non-dyntick-idle CPU check Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 06/48] rcu: Fix bogus CONFIG_PROVE_LOCKING in comments to reflect reality Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 07/48] rcu: fix now-bogus rcu_scheduler_active comments Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 08/48] rcu: shrink rcutiny by making synchronize_rcu_bh() be inline Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 09/48] rcu: rename rcutiny rcu_ctrlblk to rcu_sched_ctrlblk Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 10/48] rcu: refactor RCU's context-switch handling Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 11/48] rcu: slim down rcutiny by removing rcu_scheduler_active and friends Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 12/48] rcu: enable CPU_STALL_VERBOSE by default Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 13/48] rcu: disable CPU stall warnings upon panic Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 14/48] rcu: print boot-time console messages if RCU configs out of ordinary Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 15/48] rcu: improve RCU CPU stall-warning messages Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 16/48] rcu: permit discontiguous cpu_possible_mask CPU numbering Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 17/48] rcu: v2: reduce the number of spurious RCU_SOFTIRQ invocations Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 18/48] rcu: improve the RCU CPU-stall warning documentation Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 19/48] Debugobjects transition check Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 20/48] rcu head introduce rcu head init on stack Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 21/48] remove all rcu head initializations, except on_stack initializations Paul E. McKenney
2010-05-04 20:27 ` Matt Mackall
2010-05-04 20:36 ` Paul E. McKenney
2010-05-04 23:44 ` James Morris
2010-05-05 0:03 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 22/48] rcu head remove init Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 23/48] tree/tiny rcu: Add debug RCU head objects (v5) Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 24/48] rcu: make SRCU usable in modules Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 25/48] rcu: fix debugobjects rcu head init on stack in rcutree_plugin.h Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 26/48] rcu: RCU_FAST_NO_HZ must check RCU dyntick state Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 27/48] vfs: add fs.h to define struct file Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 28/48] net: Make accesses to ->br_port safe for sparse RCU Paul E. McKenney
2010-05-04 21:26 ` Stephen Hemminger
2010-05-04 21:41 ` Arnd Bergmann
2010-05-05 22:03 ` Paul E. McKenney [this message]
2010-05-06 14:09 ` Arnd Bergmann
2010-05-06 23:12 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 29/48] rcu: add an rcu_dereference_index_check() Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 30/48] mce: convert to rcu_dereference_index_check() Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 31/48] rcu: define __rcu address space modifier for sparse Paul E. McKenney
2010-05-04 20:58 ` Arnd Bergmann
2010-05-04 23:07 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 32/48] rculist: avoid __rcu annotations Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 33/48] cgroups: " Paul E. McKenney
2010-05-04 20:48 ` Paul Menage
2010-05-05 0:04 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 34/48] credentials: rcu annotation Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 35/48] keys: __rcu annotations Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 36/48] nfs: " Paul E. McKenney
2010-05-05 10:14 ` David Howells
2010-05-05 12:44 ` Trond Myklebust
2010-05-05 21:01 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 37/48] net: __rcu annotations for drivers Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 38/48] perf_event: __rcu annotations Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 39/48] notifiers: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 40/48] radix-tree: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 41/48] idr: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 42/48] input: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 43/48] vhost: add " Paul E. McKenney
2010-05-04 21:39 ` Michael S. Tsirkin
2010-05-04 23:57 ` Paul E. McKenney
2010-05-04 23:59 ` Michael S. Tsirkin
2010-05-05 0:39 ` Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 44/48] net/netfilter: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 45/48] kvm: add " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 46/48] kernel: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 47/48] net: " Paul E. McKenney
2010-05-04 20:19 ` [PATCH tip/core/rcu 48/48] kvm: more " Paul E. McKenney
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