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From:   Pierre Gondois <pierre.gondois@arm.com>
To:     linux-kernel@vger.kernel.org
Cc:     Radu Rendec <rrendec@redhat.com>,
        Alexandre Ghiti <alexghiti@rivosinc.com>,
        Conor Dooley <conor.dooley@microchip.com>,
        Will Deacon <will@kernel.org>,
        Pierre Gondois <pierre.gondois@arm.com>,
        Conor Dooley <conor@kernel.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Palmer Dabbelt <palmer@rivosinc.com>,
        Gavin Shan <gshan@redhat.com>
Subject: [PATCH v3 3/4] arch_topology: Remove early cacheinfo error message
Date:   Thu, 13 Apr 2023 11:14:33 +0200
Message-Id: <20230413091436.230134-4-pierre.gondois@arm.com>
In-Reply-To: <20230413091436.230134-1-pierre.gondois@arm.com>
References: <20230413091436.230134-1-pierre.gondois@arm.com>
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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.

Suggested-by: Conor Dooley <conor@kernel.org>
Link: https://lore.kernel.org/all/20230404-hatred-swimmer-6fecdf33b57a@spud/
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
---
 drivers/base/arch_topology.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index b1c1dd38ab01..1f071eaede5b 100644
--- a/drivers/base/arch_topology.c
+++ b/drivers/base/arch_topology.c
@@ -843,10 +843,8 @@ void __init init_cpu_topology(void)
 
 	for_each_possible_cpu(cpu) {
 		ret = fetch_cache_info(cpu);
-		if (ret) {
-			pr_err("Early cacheinfo failed, ret = %d\n", ret);
+		if (ret)
 			break;
-		}
 	}
 }
 
-- 
2.25.1