Messages in this thread Patch in this message | | | From | Pierre Gondois <> | Subject | [PATCH v4 3/4] arch_topology: Remove early cacheinfo error message if -ENOENT | Date | Fri, 14 Apr 2023 10:14:51 +0200 |
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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 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> --- 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 b1c1dd38ab01..c4b6198d7461 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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