linux-kernel - [PATCH V2] arm64: add SCHED_CLUSTER's dependency on ACPI

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Date:   Sun, 24 Apr 2022 19:55:01 -0700
From:   Qing Wang <wangqing@...o.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     vincent.guittot@...aro.org, peterz@...radead.org,
        dietmar.eggemann@....com, Wang Qing <wangqing@...o.com>
Subject: [PATCH V2] arm64: add SCHED_CLUSTER's dependency on ACPI

From: Wang Qing <wangqing@...o.com>

cluster sched_domain configured by cpu_topology[].cluster_sibling, 
which is set by cluster_id, cluster_id can only get from ACPI.

If the system does not enable ACPI, cluster_id is always -1, even enable
SCHED_CLUSTER is invalid, this is misleading. 

So we add SCHED_CLUSTER's dependency on ACPI here.

Signed-off-by: Wang Qing <wangqing@...o.com>
---
v2:
- just modify commit log
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 25b33feed800..edbe035cb0e3 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1199,6 +1199,7 @@ config SCHED_MC
 
 config SCHED_CLUSTER
 	bool "Cluster scheduler support"
+	depends on ACPI
 	help
 	  Cluster scheduler support improves the CPU scheduler's decision
 	  making when dealing with machines that have clusters of CPUs.
-- 
2.27.0.windows.1