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Subject[PATCH v5 09/22] arm64: capabilities: Split the processing of errata work arounds
Right now we run through the errata workarounds check on all boot
active CPUs, with SCOPE_ALL. This wouldn't help for detecting erratum
workarounds with a SYSTEM_SCOPE. There are none yet, but we plan to
introduce some: let us clean this up so that such workarounds can be
detected and enabled correctly.

So, we run the checks with SCOPE_LOCAL_CPU on all CPUs and SCOPE_SYSTEM
checks are run only once after all the boot time CPUs are active.

Reviewed-by: Dave Martin <>
Signed-off-by: Suzuki K Poulose <>
arch/arm64/kernel/cpufeature.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 703215f..b8d23f4 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -560,7 +560,7 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info)
* Run the errata work around checks on the boot CPU, once we have
* initialised the cpu feature infrastructure.
- update_cpu_capabilities(arm64_errata, SCOPE_ALL,
+ update_cpu_capabilities(arm64_errata, SCOPE_LOCAL_CPU,
"enabling workaround for");

@@ -1452,7 +1452,7 @@ void check_local_cpu_capabilities(void)
* advertised capabilities.
if (!sys_caps_initialised)
- update_cpu_capabilities(arm64_errata, SCOPE_ALL,
+ update_cpu_capabilities(arm64_errata, SCOPE_LOCAL_CPU,
"enabling workaround for");
@@ -1480,6 +1480,8 @@ void __init setup_cpu_features(void)

/* Set the CPU feature capabilies */
update_cpu_capabilities(arm64_features, SCOPE_ALL, "detected:");
+ update_cpu_capabilities(arm64_errata, SCOPE_SYSTEM,
+ "enabling workaround for");
enable_cpu_capabilities(arm64_features, SCOPE_ALL);
enable_cpu_capabilities(arm64_errata, SCOPE_ALL);
 \ /
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