x86/CPU: Make intel_num_cpu_cores() generic

intel_num_cpu_cores() is a static function in intel.c which can't be used
by other files. Define another function called detect_num_cpu_cores() in
common.c to replace this function so it can be reused.

Signed-off-by: David Wang <davidwang@zhaoxin.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: lukelin@viacpu.com
Cc: qiyuanwang@zhaoxin.com
Cc: gregkh@linuxfoundation.org
Cc: brucechang@via-alliance.com
Cc: timguo@zhaoxin.com
Cc: cooperyan@zhaoxin.com
Cc: hpa@zytor.com
Cc: benjaminpan@viatech.com
Link: https://lkml.kernel.org/r/1525314766-18910-2-git-send-email-davidwang@zhaoxin.com

3 files changed, 16 insertions, 19 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 37c7c8334a00..6993842e788c 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -584,6 +584,20 @@ static void get_model_name(struct cpuinfo_x86 *c)
         *(s + 1) = '\0';
 }
 
+int detect_num_cpu_cores(struct cpuinfo_x86 *c)
+{
+        unsigned int eax, ebx, ecx, edx;
+
+        if (!IS_ENABLED(CONFIG_SMP) || c->cpuid_level < 4)
+                return 1;
+
+        cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
+        if (eax & 0x1f)
+                return (eax >> 26) + 1;
+        else
+                return 1;
+}
+
 void cpu_detect_cache_sizes(struct cpuinfo_x86 *c)
 {
         unsigned int n, dummy, ebx, ecx, edx, l2size;
diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h
index c415f99e9599..efd6ef8ad14e 100644
--- a/arch/x86/kernel/cpu/cpu.h
+++ b/arch/x86/kernel/cpu/cpu.h
@@ -54,6 +54,7 @@ extern u32 get_scattered_cpuid_leaf(unsigned int level,
 extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
 extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
 
+extern int detect_num_cpu_cores(struct cpuinfo_x86 *c);
 extern int detect_extended_topology(struct cpuinfo_x86 *c);
 extern void detect_ht(struct cpuinfo_x86 *c);
 
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index b9693b80fc21..b54535be254a 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -453,24 +453,6 @@ static void srat_detect_node(struct cpuinfo_x86 *c)
 #endif
 }
 
-/*
- * find out the number of processor cores on the die
- */
-static int intel_num_cpu_cores(struct cpuinfo_x86 *c)
-{
-        unsigned int eax, ebx, ecx, edx;
-
-        if (!IS_ENABLED(CONFIG_SMP) || c->cpuid_level < 4)
-                return 1;
-
-        /* Intel has a non-standard dependency on %ecx for this CPUID level. */
-        cpuid_count(4, 0, &eax, &ebx, &ecx, &edx);
-        if (eax & 0x1f)
-                return (eax >> 26) + 1;
-        else
-                return 1;
-}
-
 static void detect_vmx_virtcap(struct cpuinfo_x86 *c)
 {
         /* Intel VMX MSR indicated features */
@@ -671,7 +653,7 @@ static void init_intel(struct cpuinfo_x86 *c)
                  * let's use the legacy cpuid vector 0x1 and 0x4 for topology
                  * detection.
                  */
-                c->x86_max_cores = intel_num_cpu_cores(c);
+                c->x86_max_cores = detect_num_cpu_cores(c);
 #ifdef CONFIG_X86_32
                 detect_ht(c);
 #endif