linux-kernel - [Patch 5/6] arm64: cpufeature: Export get_cpu_with_amu

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Date:   Tue, 18 Apr 2023 17:04:58 +0530
From:   Sumit Gupta <sumitg@...dia.com>
To:     <viresh.kumar@...aro.org>, <rafael@...nel.org>,
        <ionela.voinescu@....com>, <mark.rutland@....com>,
        <sudeep.holla@....com>, <lpieralisi@...nel.org>,
        <catalin.marinas@....com>, <will@...nel.org>
CC:     <linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <treding@...dia.com>, <jonathanh@...dia.com>, <vsethi@...dia.com>,
        <sdonthineni@...dia.com>, <sanjayc@...dia.com>,
        <ksitaraman@...dia.com>, <bbasu@...dia.com>, <sumitg@...dia.com>
Subject: [Patch 5/6] arm64: cpufeature: Export get_cpu_with_amu_feat func

Export the get_cpu_with_amu_feat() function for use by
"cppc_cpufreq" to check if any CPU implements ARM's
Activity Monitor Unit (AMU). If AMU is available, then
for re-constructing the current CPU freq from its
counters, queue work on target CPU to read the counters
in a single call instead of reading them in separate
smp calls.

Signed-off-by: Sumit Gupta <sumitg@...dia.com>
---
 arch/arm64/kernel/cpufeature.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index d9345e9c0226..ec31da7043eb 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1917,6 +1917,7 @@ int get_cpu_with_amu_feat(void)
 {
 	return cpumask_any(&amu_cpus);
 }
+EXPORT_SYMBOL_GPL(get_cpu_with_amu_feat);
 
 static void cpu_amu_enable(struct arm64_cpu_capabilities const *cap)
 {
-- 
2.17.1