From: Pierre Gondois <pierre.gondois@arm.com>
Date: Fri, 14 Apr 2023 08:14:51 +0000 (+0200)
Subject: arch_topology: Remove early cacheinfo error message if -ENOENT
X-Git-Tag: v6.6.17~5001^2~5^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3522340199cc060b70f0094e3039bdb43c3f6ee1;p=platform%2Fkernel%2Flinux-rpi.git

arch_topology: Remove early cacheinfo error message if -ENOENT

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>
---

diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c
index 147fb7d..b741b5b 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;
 	}
 }