linux-kernel - Re: [PATCH] sched: Move enum CPU_[xxx

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Date:	Thu, 05 Jun 2014 12:46:47 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: Move enum CPU_[xxx_]IDLE to private sched.h

On 06/05/2014 12:35 PM, Ingo Molnar wrote:
>
> * Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>
>> On 06/05/2014 12:17 PM, Ingo Molnar wrote:
>>>
>>> * Peter Zijlstra <peterz@...radead.org> wrote:
>>>
>>>> On Tue, Jun 03, 2014 at 02:59:05PM +0200, Daniel Lezcano wrote:
>>>>> The different enum CPU_IDLE, CPU_NOT_IDLE, CPU_NEWLY_IDLE and
>>>>> CPU_MAX_IDLE_TYPES are only used in kernel/sched/fair.c and
>>>>> kernel/sched/stats.c.
>>>>>
>>>>> Move their definitions in the private 'sched.h' file located in the
>>>>> same place than the files above.
>>>>>
>>>>
>>>> Thanks!
>>>
>>>
>>> So this patch breaks x86 64-bit and 32-bit defconfigs:
>>>
>>> In file included from
>>> /home/mingo/tip/arch/x86/kernel/asm-offsets.c:9:0:
>>> /home/mingo/tip/include/linux/sched.h:939:24: error:
>>> ‘CPU_MAX_IDLE_TYPES’ undeclared here (not in a function)
>>>    unsigned int lb_count[CPU_MAX_IDLE_TYPES];
>>>                          ^
>>> make[2]: *** [arch/x86/kernel/asm-offsets.s] Error 1
>>> make[1]: *** [prepare0] Error 2
>>> make: *** [sub-make] Error 2
>>
>>
>> Gah ! That deserves -10 points to my karma :(
>>
>> I did not enabled CONFIG_SCHEDSTATS.
>>
>> Sorry for the inconvenience.
>
> No problem. sched.h is a bit of a mess when it comes to data structure
> dependencies, due to all of 'struct task_struct' having to be defined
> by the time random kernel code references task->.
>
> But this is about 'struct sched_domain', and I think we might be able
> to move that out of sched.h and into a separate header... In theory
> only scheduler internals (arch topology definitions and cores cheduler
> code) should know about it.

Ok, I will look at it.

Thanks
   -- Daniel



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