Re: [PATCH 5/5] drivers/cpufreq: Convert some slow-path static_cpu_has() callers to boot_cpu_has()

[Rafael J. Wysocki]

On Sat, Mar 30, 2019 at 12:20 PM Borislav Petkov <bp@xxxxxxxxx> wrote:
>
> From: Borislav Petkov <bp@xxxxxxx>
>
> Using static_cpu_has() is pointless on those paths, convert them to the
> boot_cpu_has() variant.
>
> No functional changes.
>
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
> Cc: Len Brown <lenb@xxxxxxxxxx>
> Cc: linux-pm@xxxxxxxxxxxxxxx
> Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
> Cc: Viresh Kumar <viresh.kumar@xxxxxxxxxx>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>

> ---
>  drivers/cpufreq/amd_freq_sensitivity.c |  2 +-
>  drivers/cpufreq/intel_pstate.c         | 18 +++++++++---------
>  drivers/cpufreq/powernow-k8.c          |  2 +-
>  3 files changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/cpufreq/amd_freq_sensitivity.c b/drivers/cpufreq/amd_freq_sensitivity.c
> index 4ac7c3cf34be..6927a8c0e748 100644
> --- a/drivers/cpufreq/amd_freq_sensitivity.c
> +++ b/drivers/cpufreq/amd_freq_sensitivity.c
> @@ -124,7 +124,7 @@ static int __init amd_freq_sensitivity_init(void)
>                         PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, NULL);
>
>         if (!pcidev) {
> -               if (!static_cpu_has(X86_FEATURE_PROC_FEEDBACK))
> +               if (!boot_cpu_has(X86_FEATURE_PROC_FEEDBACK))
>                         return -ENODEV;
>         }
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index e22f0dbaebb1..ea62e3f02d56 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -522,7 +522,7 @@ static s16 intel_pstate_get_epb(struct cpudata *cpu_data)
>         u64 epb;
>         int ret;
>
> -       if (!static_cpu_has(X86_FEATURE_EPB))
> +       if (!boot_cpu_has(X86_FEATURE_EPB))
>                 return -ENXIO;
>
>         ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
> @@ -536,7 +536,7 @@ static s16 intel_pstate_get_epp(struct cpudata *cpu_data, u64 hwp_req_data)
>  {
>         s16 epp;
>
> -       if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
> +       if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
>                 /*
>                  * When hwp_req_data is 0, means that caller didn't read
>                  * MSR_HWP_REQUEST, so need to read and get EPP.
> @@ -561,7 +561,7 @@ static int intel_pstate_set_epb(int cpu, s16 pref)
>         u64 epb;
>         int ret;
>
> -       if (!static_cpu_has(X86_FEATURE_EPB))
> +       if (!boot_cpu_has(X86_FEATURE_EPB))
>                 return -ENXIO;
>
>         ret = rdmsrl_on_cpu(cpu, MSR_IA32_ENERGY_PERF_BIAS, &epb);
> @@ -609,7 +609,7 @@ static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data)
>         if (epp < 0)
>                 return epp;
>
> -       if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
> +       if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
>                 if (epp == HWP_EPP_PERFORMANCE)
>                         return 1;
>                 if (epp <= HWP_EPP_BALANCE_PERFORMANCE)
> @@ -618,7 +618,7 @@ static int intel_pstate_get_energy_pref_index(struct cpudata *cpu_data)
>                         return 3;
>                 else
>                         return 4;
> -       } else if (static_cpu_has(X86_FEATURE_EPB)) {
> +       } else if (boot_cpu_has(X86_FEATURE_EPB)) {
>                 /*
>                  * Range:
>                  *      0x00-0x03       :       Performance
> @@ -646,7 +646,7 @@ static int intel_pstate_set_energy_pref_index(struct cpudata *cpu_data,
>
>         mutex_lock(&intel_pstate_limits_lock);
>
> -       if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
> +       if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
>                 u64 value;
>
>                 ret = rdmsrl_on_cpu(cpu_data->cpu, MSR_HWP_REQUEST, &value);
> @@ -821,7 +821,7 @@ static void intel_pstate_hwp_set(unsigned int cpu)
>                 epp = cpu_data->epp_powersave;
>         }
>  update_epp:
> -       if (static_cpu_has(X86_FEATURE_HWP_EPP)) {
> +       if (boot_cpu_has(X86_FEATURE_HWP_EPP)) {
>                 value &= ~GENMASK_ULL(31, 24);
>                 value |= (u64)epp << 24;
>         } else {
> @@ -846,7 +846,7 @@ static void intel_pstate_hwp_force_min_perf(int cpu)
>         value |= HWP_MIN_PERF(min_perf);
>
>         /* Set EPP/EPB to min */
> -       if (static_cpu_has(X86_FEATURE_HWP_EPP))
> +       if (boot_cpu_has(X86_FEATURE_HWP_EPP))
>                 value |= HWP_ENERGY_PERF_PREFERENCE(HWP_EPP_POWERSAVE);
>         else
>                 intel_pstate_set_epb(cpu, HWP_EPP_BALANCE_POWERSAVE);
> @@ -1194,7 +1194,7 @@ static void __init intel_pstate_sysfs_expose_params(void)
>  static void intel_pstate_hwp_enable(struct cpudata *cpudata)
>  {
>         /* First disable HWP notification interrupt as we don't process them */
> -       if (static_cpu_has(X86_FEATURE_HWP_NOTIFY))
> +       if (boot_cpu_has(X86_FEATURE_HWP_NOTIFY))
>                 wrmsrl_on_cpu(cpudata->cpu, MSR_HWP_INTERRUPT, 0x00);
>
>         wrmsrl_on_cpu(cpudata->cpu, MSR_PM_ENABLE, 0x1);
> diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
> index fb77b39a4ce3..3c12e03fa343 100644
> --- a/drivers/cpufreq/powernow-k8.c
> +++ b/drivers/cpufreq/powernow-k8.c
> @@ -1178,7 +1178,7 @@ static int powernowk8_init(void)
>         unsigned int i, supported_cpus = 0;
>         int ret;
>
> -       if (static_cpu_has(X86_FEATURE_HW_PSTATE)) {
> +       if (boot_cpu_has(X86_FEATURE_HW_PSTATE)) {
>                 __request_acpi_cpufreq();
>                 return -ENODEV;
>         }
> --
> 2.21.0
>