From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Josh Triplett <josh@joshtriplett.org>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org,
rostedt@goodmis.org, Valdis.Kletnieks@vt.edu,
dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com,
fweisbec@gmail.com, patches@linaro.org
Subject: Re: [PATCH tip/core/rcu 04/14] rcu: Add a gcc-style structure initializer for RCU pointers
Date: Fri, 15 Jun 2012 14:22:13 -0700 [thread overview]
Message-ID: <20120615212213.GL2389@linux.vnet.ibm.com> (raw)
In-Reply-To: <20120615204813.GI31184@leaf>
On Fri, Jun 15, 2012 at 01:48:14PM -0700, Josh Triplett wrote:
> On Fri, Jun 15, 2012 at 01:13:05PM -0700, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
> >
> > RCU_INIT_POINTER() returns a value that is never used, and which should
> > be abolished due to terminal ugliness:
> >
> > q = RCU_INIT_POINTER(global_p, p);
> >
> > However, there are two uses that cannot be handled by a do-while
> > formulation because they do gcc-style initialization:
> >
> > RCU_INIT_POINTER(.real_cred, &init_cred),
> > RCU_INIT_POINTER(.cred, &init_cred),
> >
> > This usage is clever, but not necessarily the nicest approach. This
> > commit therefore creates an INIT_RCU_POINTER() macro that is specifically
> > designed for gcc-style initialization.
>
> The concept seems fine, but the names seem entirely non-obvious.
> RCU_INIT_POINTER versus INIT_RCU_POINTER?
I was following things like INIT_THREAD_INFO(), with the leading "INIT_"
for gcc initialization.
Thanx, Paul
next prev parent reply other threads:[~2012-06-15 21:23 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-15 20:12 [PATCH tip/core/rcu 0/14] Fixups for 3.6 Paul E. McKenney
2012-06-15 20:13 ` [PATCH tip/core/rcu 01/14] rcu: Fix detection of abruptly-ending stall Paul E. McKenney
2012-06-15 20:13 ` [PATCH tip/core/rcu 02/14] rcu: Consolidate duplicate callback-list initialization Paul E. McKenney
2012-06-15 20:42 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 03/14] rcu: Add ACCESS_ONCE() to ->qlen accesses Paul E. McKenney
2012-06-15 20:45 ` Josh Triplett
2012-06-15 22:24 ` Paul E. McKenney
2012-06-15 20:13 ` [PATCH tip/core/rcu 04/14] rcu: Add a gcc-style structure initializer for RCU pointers Paul E. McKenney
2012-06-15 20:48 ` Josh Triplett
2012-06-15 21:22 ` Paul E. McKenney [this message]
2012-06-15 21:50 ` Josh Triplett
2012-06-15 22:47 ` Paul E. McKenney
2012-06-15 20:13 ` [PATCH tip/core/rcu 05/14] rcu: Use new INIT_RCU_POINTER for gcc-style initializations Paul E. McKenney
2012-06-15 20:13 ` [PATCH tip/core/rcu 06/14] rcu: Remove return value from RCU_INIT_POINTER() Paul E. McKenney
2012-06-15 20:50 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 07/14] key: Remove extraneous parentheses from rcu_assign_keypointer() Paul E. McKenney
2012-06-15 20:50 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 08/14] rcu: Remove return value from rcu_assign_pointer() Paul E. McKenney
2012-06-15 20:53 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 09/14] rcu: Consolidate tree/tiny __rcu_read_{,un}lock() implementations Paul E. McKenney
2012-06-15 20:59 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 10/14] rcu: Remove function versions of __kfree_rcu and __is_kfree_rcu_offset Paul E. McKenney
2012-06-15 20:59 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 11/14] rcu: Make __call_rcu() handle invocation from idle Paul E. McKenney
2012-06-15 21:02 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 12/14] rcu: Prevent __call_rcu() from invoking RCU core on offline CPUs Paul E. McKenney
2012-06-15 21:04 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 13/14] rcu: Split RCU core processing out of __call_rcu() Paul E. McKenney
2012-06-15 21:25 ` Josh Triplett
2012-06-15 20:13 ` [PATCH tip/core/rcu 14/14] rcu: Fix rcu_is_cpu_idle() #ifdef in TINY_RCU Paul E. McKenney
2012-06-15 21:28 ` Josh Triplett
2012-06-15 22:57 ` Paul E. McKenney
2012-06-15 23:05 ` Josh Triplett
2012-06-15 20:40 ` [PATCH tip/core/rcu 01/14] rcu: Fix detection of abruptly-ending stall Josh Triplett
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