linux-kernel - [PATCH v6 20/21] arch_topology: Warn that topology for nested clusters is not supported

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Message-Id: <20220704101605.1318280-21-sudeep.holla@arm.com>
Date:   Mon,  4 Jul 2022 11:16:04 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Sudeep Holla <sudeep.holla@....com>, conor.dooley@...rochip.com,
        valentina.fernandezalanis@...rochip.com,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Qing Wang <wangqing@...o.com>,
        Rob Herring <robh+dt@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Ionela Voinescu <ionela.voinescu@....com>,
        Pierre Gondois <pierre.gondois@....com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org
Subject: [PATCH v6 20/21] arch_topology: Warn that topology for nested clusters is not supported

We don't support the topology for clusters of CPU clusters while the
DT and ACPI bindings theoritcally support the same. Just warn about the
same so that it is clear to the users of arch_topology that the nested
clusters are not yet supported.

Tested-by: Ionela Voinescu <ionela.voinescu@....com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/base/arch_topology.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 8719c4458df9..441e14ac33a4 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -567,6 +567,8 @@ static int __init parse_cluster(struct device_node *cluster, int package_id,
 		if (c) {
 			leaf = false;
 			ret = parse_cluster(c, package_id, i, depth + 1);
+			if (depth > 0)
+				pr_warn("Topology for clusters of clusters not yet supported\n");
 			of_node_put(c);
 			if (ret != 0)
 				return ret;
-- 
2.37.0