From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: "H. Peter Anvin" <hpa@linux.intel.com>
Cc: Jan Beulich <JBeulich@novell.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>, Ingo Molnar <mingo@elte.hu>,
Alexander van Heukelum <heukelum@fastmail.fm>,
Dipankar Sarma <dipankar@in.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Sam Ravnborg <sam@ravnborg.org>,
David Howells <dhowells@redhat.com>,
Oleg Nesterov <oleg@redhat.com>,
Roland McGrath <roland@redhat.com>,
Serge Hallyn <serue@us.ibm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 4/5] RCU: Add TASK_RCU_OFFSET
Date: Tue, 29 Mar 2011 14:31:30 -0700 [thread overview]
Message-ID: <20110329213130.GK2261@linux.vnet.ibm.com> (raw)
In-Reply-To: <4D924BAF.1020906@linux.intel.com>
On Tue, Mar 29, 2011 at 02:14:23PM -0700, H. Peter Anvin wrote:
> On 03/28/2011 01:35 AM, Jan Beulich wrote:
> >>>> On 28.03.11 at 05:00, Lai Jiangshan <laijs@cn.fujitsu.com> wrote:
> >>
> >> We can not include linux/sched.h in linux/rcupdate.h.
> >> If we access task's task_rcu_strut without linux/sched.h included,
> >> We will failed with compiling error.
> >>
> >> So we add TASK_RCU_OFFSET, which help us access
> >> task's task_rcu_strut without linux/sched.h included.
> >> Now, task_rcu_struct(), current_task_rcu_struct(), task_of_task_rcu() and
> >> rcu_copy_process() can be used anywhere without linux/sched.h included.
> >
> > Aren't the offsets-generation methods meant for assembly
> > consumption only? Header dependency problems normally can
> > be solved by splitting headers into a type declaration one and
> > a second one carrying inline function implementations. Is that
> > indeed completely impossible here?
>
> I have to say that if we have to use hardcoded offsets in C then we have
> bigger problems.
In this case, the offsets are mechanically generated from the structure
definitions.
Or am I missing your point?
Thanx, Paul
next prev parent reply other threads:[~2011-03-29 21:31 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-28 2:55 [RFC PATCH 0/5] Add kernel-offset file and make rcu_read_[un]lock() included Lai Jiangshan
2011-03-28 2:58 ` [RFC PATCH 1/5] Move task's RCU code to rcupdate.h Lai Jiangshan
2011-03-31 11:31 ` Peter Zijlstra
2011-03-31 23:24 ` Paul E. McKenney
2011-03-28 2:58 ` [RFC PATCH 2/5] kbuild: dedumplicated the generating code Lai Jiangshan
2011-03-28 8:31 ` Jan Beulich
2011-03-31 18:26 ` David Howells
2011-03-28 2:59 ` [RFC PATCH 3/5] kbuild: add kernel-offset file Lai Jiangshan
2011-03-31 18:28 ` David Howells
2011-03-28 3:00 ` [RFC PATCH 4/5] RCU: Add TASK_RCU_OFFSET Lai Jiangshan
2011-03-28 8:35 ` Jan Beulich
2011-03-29 9:41 ` Lai Jiangshan
2011-03-29 21:14 ` H. Peter Anvin
2011-03-29 21:31 ` Paul E. McKenney [this message]
2011-03-29 21:32 ` H. Peter Anvin
2011-03-29 21:47 ` Paul E. McKenney
2011-03-29 22:01 ` H. Peter Anvin
2011-03-30 0:47 ` Paul E. McKenney
2011-03-30 5:25 ` Lai Jiangshan
2011-03-30 7:22 ` Lai Jiangshan
2011-03-30 10:55 ` Michal Marek
2011-03-30 10:57 ` Peter Zijlstra
2011-03-30 11:46 ` Michal Marek
2011-03-31 1:02 ` Lai Jiangshan
2011-03-31 1:21 ` Paul E. McKenney
2011-03-31 1:53 ` Lai Jiangshan
2011-03-31 23:30 ` Paul E. McKenney
2011-04-01 3:28 ` Paul E. McKenney
2011-03-31 8:04 ` Peter Zijlstra
2011-03-31 9:50 ` Lai Jiangshan
2011-03-31 11:18 ` Peter Zijlstra
2011-04-01 1:57 ` Lai Jiangshan
2011-04-01 11:35 ` Peter Zijlstra
2011-04-05 21:54 ` Paul E. McKenney
2011-04-05 23:07 ` Paul E. McKenney
2011-04-06 8:10 ` Peter Zijlstra
2011-04-06 19:21 ` Paul E. McKenney
2011-04-06 20:13 ` Paul E. McKenney
2011-04-06 21:06 ` Peter Zijlstra
2011-04-06 21:27 ` H. Peter Anvin
2011-04-07 0:30 ` Paul E. McKenney
2011-04-07 5:49 ` Lai Jiangshan
2011-04-07 15:47 ` Paul E. McKenney
2011-04-07 16:26 ` Paul E. McKenney
2011-04-08 1:26 ` Lai Jiangshan
2011-04-08 5:13 ` Paul E. McKenney
2011-04-11 3:08 ` Lai Jiangshan
2011-04-11 5:12 ` Paul E. McKenney
2011-04-11 6:01 ` Lai Jiangshan
2011-04-11 8:31 ` Lai Jiangshan
2011-04-11 21:02 ` Paul E. McKenney
2011-04-11 21:24 ` Peter Zijlstra
2011-04-22 7:19 ` Lai Jiangshan
2011-04-22 8:10 ` Peter Zijlstra
2011-04-25 7:21 ` Lai Jiangshan
2011-04-23 20:30 ` Paul E. McKenney
2011-04-11 8:33 ` Lai Jiangshan
2011-04-07 7:05 ` [PATCH 1/4] rcu: split rcupdate.h Lai Jiangshan
2011-04-07 7:07 ` [PATCH 2/4] rcu: make rcudpate.h can use struct task_struct Lai Jiangshan
2011-04-07 7:07 ` [PATCH 3/4] rcu: introduce task_rcu_struct and move task's RCU code to rcupdate_defs.h Lai Jiangshan
2011-04-07 13:40 ` Alexey Dobriyan
2011-04-07 7:08 ` [PATCH 4/4] rcu: declare preemptible __rcu_read_[un]lock() as inline function Lai Jiangshan
2011-04-06 17:41 ` [RFC PATCH 4/5] RCU: Add TASK_RCU_OFFSET Paul E. McKenney
2011-03-31 19:28 ` H. Peter Anvin
2011-03-31 19:25 ` H. Peter Anvin
2011-03-28 3:01 ` [RFC PATCH 5/5] RCU: declare preemptible __rcu_read_[un]lock() as inline function Lai Jiangshan
2011-03-28 22:17 ` [RFC PATCH 0/5] Add kernel-offset file and make rcu_read_[un]lock() included Paul E. McKenney
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