linux-kernel - [PATCH] cpufreq/intel_pstate: Fix an annoying !CONFIG

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Date:	Fri,  3 Apr 2015 15:19:53 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Kristen Carlson Accardi <kristen@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	linux-pm@...r.kernel.org
Subject: [PATCH] cpufreq/intel_pstate: Fix an annoying !CONFIG_SMP warning

From: Borislav Petkov <bp@...e.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.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Kristen Carlson Accardi <kristen@...ux.intel.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Viresh Kumar <viresh.kumar@...aro.org>
Cc: linux-pm@...r.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)
-- 
2.3.3

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