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    Subject[PATCH v2 10/22] arm64: Cleanup mixed endian support detection
    Date
    Make use of the system wide safe register to decide the support
    for mixed endian.

    Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
    ---
    arch/arm64/kernel/cpufeature.c | 32 ++++++++++----------------------
    1 file changed, 10 insertions(+), 22 deletions(-)

    diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
    index a4eff72..3506876 100644
    --- a/arch/arm64/kernel/cpufeature.c
    +++ b/arch/arm64/kernel/cpufeature.c
    @@ -24,7 +24,6 @@
    #include <asm/processor.h>
    #include <asm/sysreg.h>

    -static bool mixed_endian_el0 = true;
    unsigned long elf_hwcap __read_mostly;
    EXPORT_SYMBOL_GPL(elf_hwcap);

    @@ -42,22 +41,6 @@ unsigned int compat_elf_hwcap2 __read_mostly;

    DECLARE_BITMAP(cpu_hwcaps, ARM64_NCAPS);

    -
    -bool cpu_supports_mixed_endian_el0(void)
    -{
    - return id_aa64mmfr0_mixed_endian_el0(read_cpuid(ID_AA64MMFR0_EL1));
    -}
    -
    -bool system_supports_mixed_endian_el0(void)
    -{
    - return mixed_endian_el0;
    -}
    -
    -static void update_mixed_endian_el0_support(struct cpuinfo_arm64 *info)
    -{
    - mixed_endian_el0 &= id_aa64mmfr0_mixed_endian_el0(info->reg_id_aa64mmfr0);
    -}
    -
    #define ARM64_FTR_BITS(ftr_strict, ftr_type, ftr_shift, ftr_width, ftr_safe_val) \
    { \
    .strict = ftr_strict, \
    @@ -438,9 +421,6 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info)
    init_cpu_ftr_reg(SYS_MVFR0_EL1, info->reg_mvfr0);
    init_cpu_ftr_reg(SYS_MVFR1_EL1, info->reg_mvfr1);
    init_cpu_ftr_reg(SYS_MVFR2_EL1, info->reg_mvfr2);
    -
    - /* This will be removed later, once we start using the infrastructure */
    - update_mixed_endian_el0_support(info);
    }

    static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new)
    @@ -590,8 +570,6 @@ void update_cpu_features(int cpu,
    */
    WARN_TAINT_ONCE(taint, TAINT_CPU_OUT_OF_SPEC,
    "Unsupported CPU feature variation.\n");
    -
    - update_mixed_endian_el0_support(info);
    }

    u64 read_system_reg(u32 id)
    @@ -681,6 +659,16 @@ void check_local_cpu_features(void)
    check_cpu_capabilities(arm64_features, "detected feature:");
    }

    +bool cpu_supports_mixed_endian_el0(void)
    +{
    + return id_aa64mmfr0_mixed_endian_el0(read_cpuid(ID_AA64MMFR0_EL1));
    +}
    +
    +bool system_supports_mixed_endian_el0(void)
    +{
    + return id_aa64mmfr0_mixed_endian_el0(read_system_reg(SYS_ID_AA64MMFR0_EL1));
    +}
    +
    void __init setup_cpu_features(void)
    {
    u64 features;
    --
    1.7.9.5


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