On Wed, Sep 18, 2019 at 09:19:12PM +0800, Jia He wrote:
> +/* Decouple AF from AFDBM. */
> +bool cpu_has_hw_af(void)
> +{
> + return (read_cpuid(ID_AA64MMFR1_EL1) & 0xf);
> +}
> +Do you really want to call read_cpuid() every time? I would have thought you'd want to use the static branch mechanism to do the right thing at boot time. See Documentation/static-keys.txt.
