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From:   Florian Fainelli <florian.fainelli@broadcom.com>
To:     stable@vger.kernel.org
Cc:     Pierre Gondois <pierre.gondois@arm.com>,
        Conor Dooley <conor.dooley@microchip.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Florian Fainelli <florian.fainelli@broadcom.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        linux-kernel@vger.kernel.org (open list:GENERIC ARCHITECTURE TOPOLOGY)
Subject: [PATCH stable 6.3 v2] arch_topology: Remove early cacheinfo error message if -ENOENT
Date:   Tue, 30 May 2023 13:19:55 -0700
Message-Id: <20230530201955.848176-1-florian.fainelli@broadcom.com>
MIME-Version: 1.0
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--000000000000c75bbe05fceeedd7
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From: Pierre Gondois <pierre.gondois@arm.com>

commit 3522340199cc060b70f0094e3039bdb43c3f6ee1 upstream

fetch_cache_info() tries to get the number of cache leaves/levels
for each CPU in order to pre-allocate memory for cacheinfo struct.
Allocating this memory later triggers a:
  'BUG: sleeping function called from invalid context'
in PREEMPT_RT kernels.

If there is no cache related information available in DT or ACPI,
fetch_cache_info() fails and an error message is printed:
  'Early cacheinfo failed, ret = ...'

Not having cache information should be a valid configuration.
Remove the error message if fetch_cache_info() fails with -ENOENT.

Suggested-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/all/20230404-hatred-swimmer-6fecdf33b57a@spud/
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230414081453.244787-4-pierre.gondois@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
---
Changes in v2:

- Added missing upstream commit reference
- Added missing S-o-b

 drivers/base/arch_topology.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 147fb7d4af96..b741b5ba82bd 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -843,10 +843,11 @@ void __init init_cpu_topology(void)
 
 	for_each_possible_cpu(cpu) {
 		ret = fetch_cache_info(cpu);
-		if (ret) {
+		if (!ret)
+			continue;
+		else if (ret != -ENOENT)
 			pr_err("Early cacheinfo failed, ret = %d\n", ret);
-			break;
-		}
+		return;
 	}
 }
 
-- 
2.25.1


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