linux-kernel - Re: [PATCH 1/1] headers: fix circular dependency between linux/sched.h and linux/wait.h

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Date:	Mon, 21 Feb 2011 14:11:42 +0200
From:	David Cohen <dacohen@...il.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, peterz@...radead.org,
	linux-omap@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 1/1] headers: fix circular dependency between
 linux/sched.h and linux/wait.h

On Mon, Feb 21, 2011 at 1:05 PM, Alexey Dobriyan <adobriyan@...il.com> wrote:
> On Mon, Feb 21, 2011 at 12:20 PM, David Cohen <dacohen@...il.com> wrote:
>> Currently sched.h and wait.h have circular dependency between both.
>> wait.h defines macros wake_up*() which use macros TASK_* defined by
>> sched.h. But as sched.h indirectly includes wait.h, such wait.h header
>> file can't include sched.h too. The side effect is when some file
>> includes wait.h and tries to use its wake_up*() macros, it's necessary
>> to include sched.h also.
>> This patch moves all TASK_* macros from linux/sched.h to a new header
>> file linux/task_sched.h. This way, both sched.h and wait.h can include
>> task_sched.h and fix the circular dependency. No need to include sched.h
>> anymore when wake_up*() macros are used.
>
> Just include <linux/sched.h> in your driver.

Sounds a reasonable solution for me.

> This include splitting in small pieces is troublesome as well.

But I disagree it's troublesome. It's transparent to everyone else.
The only side effect is to not have to include sched.h when using a
macro define on wait.h.

>
> Why are you moving TASK_COMM_LEN?

This one can be moved back to sched.h.

Br,

David

>
>>  include/linux/sched.h      |   61 +-----------------------------------------
>>  include/linux/task_sched.h |   64 ++++++++++++++++++++++++++++++++++++++++++++
>>  include/linux/wait.h       |    1 +
>>  3 files changed, 66 insertions(+), 60 deletions(-)
>>  create mode 100644 include/linux/task_sched.h
>
>> --- a/include/linux/sched.h
>> +++ b/include/linux/sched.h
>> +#include <linux/task_sched.h>
>
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