Re: [PATCH] cpufreq: intel_pstate: Use raw_smp_processor_id() in hwp_get_cpu_scaling()

[srinivas pandruvada <srinivas.pandruvada@linux.intel.com>]

On Sat, 2025-04-12 at 18:34 +0800, Xi Ruoyao wrote:
> Use raw_smp_processor_id() instead of plain smp_processor_id() in
> hwp_get_cpu_scaling(), otherwise we get some errors on a Lenovo
> Thinkpad
> T14P Gen 2:
> 
>     BUG: using smp_processor_id() in preemptible [00000000] code:
> swapper/0/1
>     caller is hwp_get_cpu_scaling+0x7f/0xc0
> 
> Fixes: b52aaeeadfac ("cpufreq: intel_pstate: Avoid SMP calls to get
> cpu-type")
> Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

> ---
>  drivers/cpufreq/intel_pstate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/intel_pstate.c
> b/drivers/cpufreq/intel_pstate.c
> index 4aad79d26c64..bfc20b978240 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -2209,7 +2209,7 @@ static int knl_get_turbo_pstate(int cpu)
>  static int hwp_get_cpu_scaling(int cpu)
>  {
>  	if (hybrid_scaling_factor) {
> -		struct cpuinfo_x86 *c =
> &cpu_data(smp_processor_id());
> +		struct cpuinfo_x86 *c =
> &cpu_data(raw_smp_processor_id());
>  		u8 cpu_type = c->topo.intel_type;
>  
>  		/*