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SubjectRe: [PATCH] cpufreq/intel_pstate: Fix an annoying !CONFIG_SMP warning
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On Friday, April 03, 2015 03:19:53 PM Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
>
> I keep seeing
>
> drivers/cpufreq/intel_pstate.c: In function ‘intel_pstate_init’:
> drivers/cpufreq/intel_pstate.c:1187:26: warning: initialization from incompatible pointer type
> struct cpuinfo_x86 *c = &boot_cpu_data;
>
> when doing randconfig builds.
>
> This is caused by the fact that when !CONFIG_SMP, asm/processor.h
> defines cpu_info to boot_cpu_data and the local variable
>
> struct cpu_defaults *cpu_info
>
> overshadows it leading to this unfortunate assignment in the
> preprocessed source:
>
> struct cpu_defaults *boot_cpu_data;
> struct cpuinfo_x86 *c = &boot_cpu_data;
>
> Rename the local variable and use static_cpu_has_safe() which alleviates
> the need for defining a local cpuinfo_x86 pointer.

Kristen, any comments here?

> Signed-off-by: Borislav Petkov <bp@suse.de>
> Cc: Kristen Carlson Accardi <kristen@linux.intel.com>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Cc: linux-pm@vger.kernel.org
> ---
> drivers/cpufreq/intel_pstate.c | 12 ++++++------
> 1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 872c5772c5d3..0b883f131a73 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -31,6 +31,7 @@
> #include <asm/div64.h>
> #include <asm/msr.h>
> #include <asm/cpu_device_id.h>
> +#include <asm/cpufeature.h>
>
> #define BYT_RATIOS 0x66a
> #define BYT_VIDS 0x66b
> @@ -1183,8 +1184,7 @@ static int __init intel_pstate_init(void)
> {
> int cpu, rc = 0;
> const struct x86_cpu_id *id;
> - struct cpu_defaults *cpu_info;
> - struct cpuinfo_x86 *c = &boot_cpu_data;
> + struct cpu_defaults *cpu_def;
>
> if (no_load)
> return -ENODEV;
> @@ -1200,10 +1200,10 @@ static int __init intel_pstate_init(void)
> if (intel_pstate_platform_pwr_mgmt_exists())
> return -ENODEV;
>
> - cpu_info = (struct cpu_defaults *)id->driver_data;
> + cpu_def = (struct cpu_defaults *)id->driver_data;
>
> - copy_pid_params(&cpu_info->pid_policy);
> - copy_cpu_funcs(&cpu_info->funcs);
> + copy_pid_params(&cpu_def->pid_policy);
> + copy_cpu_funcs(&cpu_def->funcs);
>
> if (intel_pstate_msrs_not_valid())
> return -ENODEV;
> @@ -1214,7 +1214,7 @@ static int __init intel_pstate_init(void)
> if (!all_cpu_data)
> return -ENOMEM;
>
> - if (cpu_has(c,X86_FEATURE_HWP) && !no_hwp)
> + if (static_cpu_has_safe(X86_FEATURE_HWP) && !no_hwp)
> intel_pstate_hwp_enable();
>
> if (!hwp_active && hwp_only)
>

--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.


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