linux-kernel - Re: [tip: sched/urgent] sched/x86: Export 'percpu arch_freq

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Message-ID: <20240531131959.GC54413@lorien.usersys.redhat.com>
Date: Fri, 31 May 2024 09:19:59 -0400
From: Phil Auld <pauld@...hat.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [tip: sched/urgent] sched/x86: Export 'percpu arch_freq_scale'

On Fri, May 31, 2024 at 09:59:45AM -0000 tip-bot2 for Phil Auld wrote:
> The following commit has been merged into the sched/urgent branch of tip:
> 
> Commit-ID:     d40605a6823577a6c40fad6fb1f10a40ea0389d7
> Gitweb:        https://git.kernel.org/tip/d40605a6823577a6c40fad6fb1f10a40ea0389d7
> Author:        Phil Auld <pauld@...hat.com>
> AuthorDate:    Thu, 30 May 2024 14:15:48 -04:00
> Committer:     Ingo Molnar <mingo@...nel.org>
> CommitterDate: Fri, 31 May 2024 11:48:42 +02:00
> 
> sched/x86: Export 'percpu arch_freq_scale'
>

Thanks Ingo!


> Commit:
> 
>   7bc263840bc3 ("sched/topology: Consolidate and clean up access to a CPU's max compute capacity")
> 
> removed rq->cpu_capacity_orig in favor of using arch_scale_freq_capacity()
> calls. Export the underlying percpu symbol on x86 so that external trace
> point helper modules can be made to work again.
> 
> Signed-off-by: Phil Auld <pauld@...hat.com>
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Link: https://lore.kernel.org/r/20240530181548.2039216-1-pauld@redhat.com
> ---
>  arch/x86/kernel/cpu/aperfmperf.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/x86/kernel/cpu/aperfmperf.c b/arch/x86/kernel/cpu/aperfmperf.c
> index f9a8c7b..b3fa61d 100644
> --- a/arch/x86/kernel/cpu/aperfmperf.c
> +++ b/arch/x86/kernel/cpu/aperfmperf.c
> @@ -345,6 +345,7 @@ static DECLARE_WORK(disable_freq_invariance_work,
>  		    disable_freq_invariance_workfn);
>  
>  DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
> +EXPORT_PER_CPU_SYMBOL_GPL(arch_freq_scale);
>  
>  static void scale_freq_tick(u64 acnt, u64 mcnt)
>  {
> 

--