linux-kernel - Re: [RFC PATCH 4/5] RCU: Add TASK_RCU

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Message-ID: <4D924BAF.1020906@linux.intel.com>
Date:	Tue, 29 Mar 2011 14:14:23 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	Lai Jiangshan <laijs@...fujitsu.com>, Ingo Molnar <mingo@...e.hu>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Sam Ravnborg <sam@...nborg.org>,
	David Howells <dhowells@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Serge Hallyn <serue@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/5] RCU: Add TASK_RCU_OFFSET

On 03/28/2011 01:35 AM, Jan Beulich wrote:
>>>> On 28.03.11 at 05:00, Lai Jiangshan <laijs@...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.

	-hpa
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