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

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Message-ID: <4DA2BC4E.4010000@cn.fujitsu.com>
Date:	Mon, 11 Apr 2011 16:31:10 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Michal Marek <mmarek@...e.cz>,
	Jan Beulich <JBeulich@...ell.com>, Ingo Molnar <mingo@...e.hu>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sam Ravnborg <sam@...nborg.org>,
	David Howells <dhowells@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC PATCH 4/5] RCU: Add TASK_RCU_OFFSET

On 04/11/2011 01:12 PM, Paul E. McKenney wrote:

> -static inline struct task_struct *next_thread(const struct task_struct *p)
> -{
> -	return list_entry_rcu(p->thread_group.next,
> -			      struct task_struct, thread_group);
> -}
> +/* Avoid #include hell for inlining rcu_read_lock(). */
> +#define next_thread(p) \
> +	list_entry_rcu((p)->thread_group.next, struct task_struct, thread_group)
>  


It is strange for me.
The user of the API "next_thread(p)" must has two headers included, sched.h and rculist.h

I know this is a very popular pattern of user space code, is it OK for kernel?
I think a file(even a header file) uses API(Marco), it should includes the the corresponding
headers, it reduces surprises(example, the name of "next_thread()" has no "rcu",
it is not expected that rcuxxxx.h is required).

I admit the work will become very much simpler if this pattern is allowed.



man fcntl:
       #include <unistd.h>
       #include <fcntl.h>

       int fcntl(int fd, int cmd, ... /* arg */ );
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