linux-kernel - [PATCH] x86: clean up init

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Date:	Sat, 21 Jun 2008 01:14:27 -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>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: clean up init_amd()


1. move out calling of check_enable_amd_mmconf_dmi out of setup_64.c
   put it into init_amd(), so don't need to make extra dmi check for
   system with other cpus.
2. 15 --> 0xf


Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>

---
 arch/x86/kernel/cpu/amd_64.c |   22 ++++++++++++++--------
 arch/x86/kernel/setup_64.c   |    4 ----
 2 files changed, 14 insertions(+), 12 deletions(-)

Index: linux-2.6/arch/x86/kernel/cpu/amd_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/amd_64.c
+++ linux-2.6/arch/x86/kernel/cpu/amd_64.c
@@ -131,7 +131,7 @@ static void __cpuinit init_amd(struct cp
 	 * Errata 63 for SH-B3 steppings
 	 * Errata 122 for all steppings (F+ have it disabled by default)
 	 */
-	if (c->x86 == 15) {
+	if (c->x86 == 0xf) {
 		rdmsrl(MSR_K8_HWCR, value);
 		value |= 1 << 6;
 		wrmsrl(MSR_K8_HWCR, value);
@@ -143,10 +143,11 @@ static void __cpuinit init_amd(struct cp
 	clear_cpu_cap(c, 0*32+31);
 
 	/* On C+ stepping K8 rep microcode works well for copy/memset */
-	level = cpuid_eax(1);
-	if (c->x86 == 15 && ((level >= 0x0f48 && level < 0x0f50) ||
-			     level >= 0x0f58))
-		set_cpu_cap(c, X86_FEATURE_REP_GOOD);
+	if (c->x86 == 0xf) {
+		level = cpuid_eax(1);
+		if((level >= 0x0f48 && level < 0x0f50) || level >= 0x0f58)
+			set_cpu_cap(c, X86_FEATURE_REP_GOOD);
+	}
 	if (c->x86 == 0x10 || c->x86 == 0x11)
 		set_cpu_cap(c, X86_FEATURE_REP_GOOD);
 
@@ -157,7 +158,7 @@ static void __cpuinit init_amd(struct cp
 	level = get_model_name(c);
 	if (!level) {
 		switch (c->x86) {
-		case 15:
+		case 0xf:
 			/* Should distinguish Models here, but this is only
 			   a fallback anyways. */
 			strcpy(c->x86_model_id, "Hammer");
@@ -176,14 +177,19 @@ static void __cpuinit init_amd(struct cp
 	else
 		num_cache_leaves = 3;
 
-	if (c->x86 == 0xf || c->x86 == 0x10 || c->x86 == 0x11)
+	if (c->x86 >= 0xf && c->x86 <= 0x11)
 		set_cpu_cap(c, X86_FEATURE_K8);
 
 	/* MFENCE stops RDTSC speculation */
 	set_cpu_cap(c, X86_FEATURE_MFENCE_RDTSC);
 
-	if (c->x86 == 0x10)
+	if (c->x86 == 0x10) {
+		/* do this for boot cpu */
+		if (c == &boot_cpu_data)
+			check_enable_amd_mmconf_dmi();
+
 		fam10h_check_enable_mmcfg();
+	}
 
 	if (c == &boot_cpu_data && c->x86 >= 0xf && c->x86 <= 0x11) {
 		unsigned long long tseg;
Index: linux-2.6/arch/x86/kernel/setup_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_64.c
+++ linux-2.6/arch/x86/kernel/setup_64.c
@@ -72,7 +72,6 @@
 #include <asm/topology.h>
 #include <asm/trampoline.h>
 #include <asm/pat.h>
-#include <asm/mmconfig.h>
 
 #include <mach_apic.h>
 #ifdef CONFIG_PARAVIRT
@@ -491,9 +490,6 @@ void __init setup_arch(char **cmdline_p)
 	conswitchp = &dummy_con;
 #endif
 #endif
-
-	/* do this before identify_cpu for boot cpu */
-	check_enable_amd_mmconf_dmi();
 }
 
 struct cpu_dev *cpu_devs[X86_VENDOR_NUM] = {};
--
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