This is a note to let you know that I've just added the patch titled
arch_topology: Remove early cacheinfo error message if -ENOENT
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arch_topology-remove-early-cacheinfo-error-message-if-enoent.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3522340199cc060b70f0094e3039bdb43c3f6ee1 Mon Sep 17 00:00:00 2001
From: Pierre Gondois <pierre.gondois@xxxxxxx>
Date: Fri, 14 Apr 2023 10:14:51 +0200
Subject: arch_topology: Remove early cacheinfo error message if -ENOENT
From: Pierre Gondois <pierre.gondois@xxxxxxx>
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@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20230404-hatred-swimmer-6fecdf33b57a@spud/
Signed-off-by: Pierre Gondois <pierre.gondois@xxxxxxx>
Reviewed-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230414081453.244787-4-pierre.gondois@xxxxxxx
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Cc: Florian Fainelli <f.fainelli@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/base/arch_topology.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- 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;
}
}
Patches currently in stable-queue which might be from pierre.gondois@xxxxxxx are
queue-6.3/cacheinfo-check-cache-properties-are-present-in-dt.patch
queue-6.3/arch_topology-remove-early-cacheinfo-error-message-if-enoent.patch
queue-6.3/cacheinfo-check-sib_leaf-in-cache_leaves_are_shared.patch
