linux-kernel - [PATCH 14/16] x86: cpu common merge generic

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Date:	Thu,  4 Sep 2008 20:09:12 -0700
From:	Yinghai Lu <yhlu.kernel@...il.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH 14/16] x86: cpu common merge generic_identify

Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
---
 arch/x86/kernel/cpu/common.c    |   15 ++++++++++++---
 arch/x86/kernel/cpu/common_64.c |   19 ++++++++++++++++---
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 61a7074..f35baa7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -548,6 +548,10 @@ void __init early_cpu_init(void)
  * of early VIA chips and (more importantly) broken virtualizers that
  * are not easy to detect.  Hence, probe for it based on first
  * principles.
+ *
+ * Note: no 64-bit chip is known to lack these, but put the code here
+ * for consistency with 32 bits, and to make it utterly trivial to
+ * diagnose the problem should it ever surface.
  */
 static void __cpuinit detect_nopl(struct cpuinfo_x86 *c)
 {
@@ -586,11 +590,16 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
 
 	if (c->cpuid_level >= 0x00000001) {
 		c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xFF;
-#ifdef CONFIG_X86_HT
+#ifdef CONFIG_X86_32
+# ifdef CONFIG_X86_HT
 		c->apicid = phys_pkg_id(c->initial_apicid, 0);
-		c->phys_proc_id = c->initial_apicid;
-#else
+# else
 		c->apicid = c->initial_apicid;
+# endif
+#endif
+
+#ifdef CONFIG_X86_HT
+		c->phys_proc_id = c->initial_apicid;
 #endif
 	}
 
diff --git a/arch/x86/kernel/cpu/common_64.c b/arch/x86/kernel/cpu/common_64.c
index 68b06a3..869a6ff 100644
--- a/arch/x86/kernel/cpu/common_64.c
+++ b/arch/x86/kernel/cpu/common_64.c
@@ -581,6 +581,9 @@ static void __cpuinit detect_nopl(struct cpuinfo_x86 *c)
 
 static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
 {
+	if (!have_cpuid_p())
+		return;
+
 	c->extended_cpuid_level = 0;
 
 	cpu_detect(c);
@@ -589,11 +592,21 @@ static void __cpuinit generic_identify(struct cpuinfo_x86 *c)
 
 	get_cpu_cap(c);
 
-	c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xff;
-#ifdef CONFIG_SMP
-	c->phys_proc_id = c->initial_apicid;
+	if (c->cpuid_level >= 0x00000001) {
+		c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xFF;
+#ifdef CONFIG_X86_32
+# ifdef CONFIG_X86_HT
+		c->apicid = phys_pkg_id(c->initial_apicid, 0);
+# else
+		c->apicid = c->initial_apicid;
+# endif
 #endif
 
+#ifdef CONFIG_X86_HT
+		c->phys_proc_id = c->initial_apicid;
+#endif
+	}
+
 	if (c->extended_cpuid_level >= 0x80000004)
 		get_model_name(c); /* Default name */
 
-- 
1.5.4.5

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