linux-kernel - [PATCH v5 19/19] arch_topology: Warn that topology for nested clusters is not supported

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Date:   Mon, 27 Jun 2022 17:50:47 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Sudeep Holla <sudeep.holla@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Atish Patra <atishp@...shpatra.org>,
        Atish Patra <atishp@...osinc.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 v5 19/19] 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.

Link: https://lore.kernel.org/r/20220621192034.3332546-21-sudeep.holla@arm.com
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 7cbe21b1b295..d7e48e995691 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;
-- 
2.36.1