linux-kernel - [PATCH] sched,x86: export percpu arch_freq

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Date: Thu, 30 May 2024 14:15:48 -0400
From: Phil Auld <pauld@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	Tony Luck <tony.luck@...el.com>,
	Qais Yousef <qyousef@...alina.io>
Subject: [PATCH] sched,x86: export percpu arch_freq_scale

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>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: x86@...nel.org
Cc: Tony Luck <tony.luck@...el.com>
Cc: Qais Yousef <qyousef@...alina.io>
---
 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 f9a8c7b7943f..b3fa61d45352 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)
 {
-- 
2.43.0