[PATCH 1/3] powerpc: copy preempt.h into arch/include/asm

[Shrikanth Hegde]

On 12/2/24 23:47, Christophe Leroy wrote:
> 
> 
> Le 02/12/2024 à 15:05, Shrikanth Hegde a écrit :
>>
>>
>> On 11/27/24 12:07, Christophe Leroy wrote:
>>>
>>>
>>> Le 25/11/2024 à 05:22, Shrikanth Hegde a écrit :
>>>> PowerPC uses asm-generic preempt definitions as of now.
>>>> Copy that into arch/asm so that arch specific changes can be done.
>>>> This would help the next patch for enabling dynamic preemption.
>>>
>>
>> The reason I want the content instead was to allow future patches 
>> where I thought of making preempt count per paca for ppc64 atleast. 
>> generic code assumes it is per thread. If this change is to be done at 
>> that point, that is fair too. I am okay with it.
> 
> I think it is better to keep series minimal and consistent. If you have 
> a futur plan, no problem, keep it future and do everything at once 
> unless it is heavy and better done in two steps.
> 
> As we say in French, a lot of water will have flowed under the bridge by 
> then.
> 
> I'm sure there will be a lot of discussion when you do that and maybe at 
> the end you will end up with something completely different than what 
> you have in mind at the moment.
> 

ok.

>>
>>
>>> Instead of copying all the content of asm-generic version, can you 
>>> just create a receptacle for your new macros, that will include asm- 
>>> generic/ preempt.h ?
>>>
>>> Look at arch/powerpc/include/asm/percpu.h for exemple.
>>>
>>
>> You mean something like below right?
>>
>>
>> #ifndef __ASM_POWERPC_PREEMPT_H
>> #define __ASM_POWERPC_PREEMPT_H
>>
>> #include <asm-generic/preempt.h>
>>
>> #if defined(CONFIG_PREEMPT_DYNAMIC) && 
>> defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY)
>> DECLARE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
>> #endif
>>
>> #endif /* __ASM_POWERPC_PREEMPT_H */
> 
> Yes exactly.
> 
> 

Should I send v2 with this and using DYNAMIC_KEY?