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SubjectRe: [PATCH 4/8] arm64: cpufeature: Remove redundant call to id_aa64pfr0_32bit_el0()
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On 04/14/2020 10:31 PM, Will Deacon wrote:
> There's no need to call id_aa64pfr0_32bit_el0() twice because the
> sanitised value of ID_AA64PFR0_EL1 has already been updated for the CPU
> being onlined.
>
> Remove the redundant function call.
>
> Signed-off-by: Will Deacon <will@kernel.org>

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>

> ---
> arch/arm64/kernel/cpufeature.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> index 838fe5cc8d7e..7dfcdd9e75c1 100644
> --- a/arch/arm64/kernel/cpufeature.c
> +++ b/arch/arm64/kernel/cpufeature.c
> @@ -792,9 +792,7 @@ void update_cpu_features(int cpu,
> * If we have AArch32, we care about 32-bit features for compat.
> * If the system doesn't support AArch32, don't update them.
> */
> - if (id_aa64pfr0_32bit_el0(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1)) &&
> - id_aa64pfr0_32bit_el0(info->reg_id_aa64pfr0)) {
> -
> + if (id_aa64pfr0_32bit_el0(read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1))) {
> taint |= check_update_ftr_reg(SYS_ID_DFR0_EL1, cpu,
> info->reg_id_dfr0, boot->reg_id_dfr0);
> taint |= check_update_ftr_reg(SYS_ID_ISAR0_EL1, cpu,
>

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