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

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Message-ID: <3de6bf25-fb3c-49a9-b06b-5e2e527ec90c@csgroup.eu>
Date: Mon, 2 Dec 2024 19:17:36 +0100
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: Shrikanth Hegde <sshegde@...ux.ibm.com>, linuxppc-dev@...ts.ozlabs.org
Cc: npiggin@...il.com, maddy@...ux.ibm.com, bigeasy@...utronix.de,
 ankur.a.arora@...cle.com, linux-kernel@...r.kernel.org,
 mark.rutland@....com, vschneid@...hat.com, peterz@...radead.org,
 Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH 1/3] powerpc: copy preempt.h into arch/include/asm



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.

> 
> 
>> 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.