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    Subject[PATCH v5 09/22] arm64: capabilities: Split the processing of errata work arounds
    Date
    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 <dave.martin@arm.com>
    Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
    ---
    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");
    else
    verify_local_cpu_capabilities();
    @@ -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);
    mark_const_caps_ready();
    --
    2.7.4
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