Re: [PATCH -tip] x86: cpu/intel.c cleanup

From: Jaswinder Singh Rajput
Date: Sat Mar 14 2009 - 09:38:16 EST

On Sat, 2009-03-14 at 14:20 +0100, Ingo Molnar wrote:

> apic.h can be included unconditionally - and the mpspec.h
> inclusion can be removed because it's included by apic.h.
>

OK

> >
> > To me it is more obvious with the old style.
> > Having ifdef's inside the block is less obvious.
> >
> > But I have not checked what is the common pattern.
>
> agreed, this one was probably cleaner with the #ifdef block
> outside.

OK, here is patch #4453:

>From f7e1165f3577174f1b6aa6473ed7b70d2ab483da Mon Sep 17 00:00:00 2001
From: Jaswinder Singh Rajput <jaswinderrajput@xxxxxxxxx>
Date: Sat, 14 Mar 2009 17:47:38 +0530
Subject: [PATCH] x86: cpu/intel.c cleanup

- fix various style problems
- fix header files issues

Signed-off-by: Jaswinder Singh Rajput <jaswinder@xxxxxxxxxx>
---
arch/x86/kernel/cpu/intel.c | 197 ++++++++++++++++++++++---------------------
1 files changed, 100 insertions(+), 97 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 5dac7bd..e7c6b32 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -1,38 +1,39 @@
-#include <linux/init.h>
+#include <linux/thread_info.h>
+#include <linux/uaccess.h>
+#include <linux/bitops.h>
#include <linux/kernel.h>
-
+#include <linux/module.h>
#include <linux/string.h>
-#include <linux/bitops.h>
-#include <linux/smp.h>
#include <linux/sched.h>
-#include <linux/thread_info.h>
-#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/smp.h>

#include <asm/processor.h>
+#include <asm/topology.h>
#include <asm/pgtable.h>
-#include <asm/msr.h>
-#include <asm/uaccess.h>
-#include <asm/ds.h>
+#include <asm/apic.h>
#include <asm/bugs.h>
+#include <asm/numa.h>
#include <asm/cpu.h>
-
-#ifdef CONFIG_X86_64
-#include <asm/topology.h>
-#include <asm/numa_64.h>
-#endif
+#include <asm/msr.h>
+#include <asm/ds.h>

#include "cpu.h"

-#ifdef CONFIG_X86_LOCAL_APIC
-#include <asm/mpspec.h>
-#include <asm/apic.h>
-#endif
+/* Intel VMX MSR indicated features */
+#define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
+#define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
+#define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
+#define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
+#define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
+#define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000

static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
{
+ u64 misc_enable;
+
/* Unmask CPUID levels if masked: */
if (c->x86 > 6 || (c->x86 == 6 && c->x86_model >= 0xd)) {
- u64 misc_enable;

rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);

@@ -44,16 +45,16 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
}

if ((c->x86 == 0xf && c->x86_model >= 0x03) ||
- (c->x86 == 0x6 && c->x86_model >= 0x0e))
+ (c->x86 == 0x6 && c->x86_model >= 0x0e))
set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);

#ifdef CONFIG_X86_64
set_cpu_cap(c, X86_FEATURE_SYSENTER32);
-#else
+#else /* CONFIG_X86_64 */
/* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
if (c->x86 == 15 && c->x86_cache_alignment == 64)
c->x86_cache_alignment = 128;
-#endif
+#endif /* CONFIG_X86_64 */

/* CPUID workaround for 0F33/0F34 CPU */
if (c->x86 == 0xF && c->x86_model == 0x3
@@ -96,19 +97,18 @@ static void __cpuinit early_init_intel(struct cpuinfo_x86 *c)
* Ingo Molnar reported a Pentium D (model 6) and a Xeon
* (model 2) with the same problem.
*/
- if (c->x86 == 15) {
- u64 misc_enable;
+ if (c->x86 != 15)
+ return;

- rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
+ rdmsrl(MSR_IA32_MISC_ENABLE, misc_enable);

- if (misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING) {
- printk(KERN_INFO "kmemcheck: Disabling fast string operations\n");
+ if (misc_enable & MSR_IA32_MISC_ENABLE_FAST_STRING) {
+ pr_info("kmemcheck: Disabling fast string operations\n");

- misc_enable &= ~MSR_IA32_MISC_ENABLE_FAST_STRING;
- wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
- }
+ misc_enable &= ~MSR_IA32_MISC_ENABLE_FAST_STRING;
+ wrmsrl(MSR_IA32_MISC_ENABLE, misc_enable);
}
-#endif
+#endif /* CONFIG_KMEMCHECK */
}

#ifdef CONFIG_X86_32
@@ -125,9 +125,11 @@ int __cpuinit ppro_with_ram_bug(void)
boot_cpu_data.x86 == 6 &&
boot_cpu_data.x86_model == 1 &&
boot_cpu_data.x86_mask < 8) {
- printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
+ pr_info("Pentium Pro with Errata#50 detected. "
+ "Taking evasive action.\n");
return 1;
}
+
return 0;
}

@@ -143,7 +145,7 @@ static void __cpuinit trap_init_f00f_bug(void)
idt_descr.address = fix_to_virt(FIX_F00F_IDT);
load_idt(&idt_descr);
}
-#endif
+#endif /* CONFIG_X86_F00F_BUG */

static void __cpuinit intel_smp_check(struct cpuinfo_x86 *c)
{
@@ -164,7 +166,22 @@ static void __cpuinit intel_smp_check(struct cpuinfo_x86 *c)
WARN_ONCE(1, "WARNING: SMP operation may be unreliable"
"with B stepping processors.\n");
}
-#endif
+#endif /* CONFIG_SMP */
+}
+
+static unsigned int __cpuinit
+intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
+{
+ /*
+ * Intel PIII Tualatin. This comes in two flavours.
+ * One has 256kb of cache, the other 512. We have no way
+ * to determine which, so we use a boottime override
+ * for the 512kb model, and assume 256 otherwise.
+ */
+ if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
+ size = 256;
+
+ return size;
}

static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
@@ -173,8 +190,9 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)

#ifdef CONFIG_X86_F00F_BUG
/*
- * All current models of Pentium and Pentium with MMX technology CPUs
- * have the F0 0F bug, which lets nonprivileged users lock up the system.
+ * All current models of Pentium and Pentium with MMX technology
+ * CPUs have the F0 0F bug, which lets nonprivileged users lock
+ * up the system.
* Note that the workaround only should be initialized once...
*/
c->f00f_bug = 0;
@@ -184,17 +202,18 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
c->f00f_bug = 1;
if (!f00f_workaround_enabled) {
trap_init_f00f_bug();
- printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
+ printk(KERN_NOTICE "Intel Pentium with F0 0F bug - "
+ "workaround enabled.\n");
f00f_workaround_enabled = 1;
}
}
-#endif
+#endif /* CONFIG_X86_F00F_BUG */

/*
* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until
* model 3 mask 3
*/
- if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
+ if ((c->x86 << 8 | c->x86_model << 4 | c->x86_mask) < 0x633)
clear_cpu_cap(c, X86_FEATURE_SEP);

/*
@@ -204,10 +223,10 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
rdmsr(MSR_IA32_MISC_ENABLE, lo, hi);
if ((lo & MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE) == 0) {
- printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
- printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
+ pr_info("CPU: C0 stepping P4 Xeon detected.\n");
+ pr_info("CPU: Disabling hardware prefetching (Errata 037)\n");
lo |= MSR_IA32_MISC_ENABLE_PREFETCH_DISABLE;
- wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
+ wrmsr(MSR_IA32_MISC_ENABLE, lo, hi);
}
}

@@ -217,7 +236,7 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
* integrated APIC (see 11AP erratum in "Pentium Processor
* Specification Update").
*/
- if (cpu_has_apic && (c->x86<<8 | c->x86_model<<4) == 0x520 &&
+ if (cpu_has_apic && (c->x86 << 8 | c->x86_model << 4) == 0x520 &&
(c->x86_mask < 0x6 || c->x86_mask == 0xb))
set_cpu_cap(c, X86_FEATURE_11AP);

@@ -238,36 +257,39 @@ static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
movsl_mask.mask = 7;
break;
}
-#endif
+#endif /* CONFIG_X86_INTEL_USERCOPY */

#ifdef CONFIG_X86_NUMAQ
numaq_tsc_disable();
-#endif
+#endif /* CONFIG_X86_NUMAQ */

intel_smp_check(c);
}
-#else
+#else /* CONFIG_X86_32 */
+
static void __cpuinit intel_workarounds(struct cpuinfo_x86 *c)
{
}
-#endif
+#endif /* CONFIG_X86_32 */

static void __cpuinit srat_detect_node(void)
{
#if defined(CONFIG_NUMA) && defined(CONFIG_X86_64)
- unsigned node;
- int cpu = smp_processor_id();
int apicid = hard_smp_processor_id();
+ int cpu = smp_processor_id();
+ unsigned node;

- /* Don't do the funky fallback heuristics the AMD version employs
- for now. */
+ /*
+ * Don't do the funky fallback heuristics the AMD version
+ * employs for now.
+ */
node = apicid_to_node[apicid];
if (node == NUMA_NO_NODE || !node_online(node))
node = first_node(node_online_map);
numa_set_node(cpu, node);

- printk(KERN_INFO "CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
-#endif
+ pr_info("CPU %d/0x%x -> Node %d\n", cpu, apicid, node);
+#endif /* CONFIG_NUMA && CONFIG_X86_64 */
}

/*
@@ -283,28 +305,20 @@ static int __cpuinit intel_num_cpu_cores(struct cpuinfo_x86 *c)
/* 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);
+ return (eax >> 26) + 1;
else
return 1;
}

static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
{
- /* Intel VMX MSR indicated features */
-#define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000
-#define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000
-#define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000
-#define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001
-#define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002
-#define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020
-
u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2;

+ clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
clear_cpu_cap(c, X86_FEATURE_TPR_SHADOW);
+ clear_cpu_cap(c, X86_FEATURE_VPID);
clear_cpu_cap(c, X86_FEATURE_VNMI);
- clear_cpu_cap(c, X86_FEATURE_FLEXPRIORITY);
clear_cpu_cap(c, X86_FEATURE_EPT);
- clear_cpu_cap(c, X86_FEATURE_VPID);

rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high);
msr_ctl = vmx_msr_high | vmx_msr_low;
@@ -329,15 +343,16 @@ static void __cpuinit detect_vmx_virtcap(struct cpuinfo_x86 *c)
static void __cpuinit init_intel(struct cpuinfo_x86 *c)
{
unsigned int l2 = 0;
+ char *p = NULL;

early_init_intel(c);

intel_workarounds(c);

/*
- * Detect the extended topology information if available. This
- * will reinitialise the initial_apicid which will be used
- * in init_intel_cacheinfo()
+ * Detect the extended topology information if available.
+ * This will reinitialise the initial_apicid which will be
+ * used in init_intel_cacheinfo()
*/
detect_extended_topology(c);

@@ -361,22 +376,19 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
ds_init_intel(c);
}

- if (c->x86 == 6 && c->x86_model == 29 && cpu_has_clflush)
- set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);
+ switch (c->x86) {
+ case 6:
+ if (c->x86_model == 29 && cpu_has_clflush)
+ set_cpu_cap(c, X86_FEATURE_CLFLUSH_MONITOR);

#ifdef CONFIG_X86_64
- if (c->x86 == 15)
- c->x86_cache_alignment = c->x86_clflush_size * 2;
- if (c->x86 == 6)
set_cpu_cap(c, X86_FEATURE_REP_GOOD);
-#else
+#else /* CONFIG_X86_64 */
/*
* Names for the Pentium II/Celeron processors
* detectable only by also checking the cache size.
* Dixon is NOT a Celeron.
*/
- if (c->x86 == 6) {
- char *p = NULL;

switch (c->x86_model) {
case 5:
@@ -403,13 +415,19 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)

if (p)
strcpy(c->x86_model_id, p);
- }

- if (c->x86 == 15)
- set_cpu_cap(c, X86_FEATURE_P4);
- if (c->x86 == 6)
set_cpu_cap(c, X86_FEATURE_P3);
-#endif
+#endif /* CONFIG_X86_64 */
+ break;
+
+ case 15:
+#ifdef CONFIG_X86_64
+ c->x86_cache_alignment = c->x86_clflush_size * 2;
+#else /* CONFIG_X86_64 */
+ set_cpu_cap(c, X86_FEATURE_P4);
+#endif /* CONFIG_X86_64 */
+ break;
+ }

if (!cpu_has(c, X86_FEATURE_XTOPOLOGY)) {
/*
@@ -419,7 +437,7 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
c->x86_max_cores = intel_num_cpu_cores(c);
#ifdef CONFIG_X86_32
detect_ht(c);
-#endif
+#endif /* CONFIG_X86_32 */
}

/* Work around errata */
@@ -429,20 +447,6 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
detect_vmx_virtcap(c);
}

-#ifdef CONFIG_X86_32
-static unsigned int __cpuinit intel_size_cache(struct cpuinfo_x86 *c, unsigned int size)
-{
- /*
- * Intel PIII Tualatin. This comes in two flavours.
- * One has 256kb of cache, the other 512. We have no way
- * to determine which, so we use a boottime override
- * for the 512kb model, and assume 256 otherwise.
- */
- if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
- size = 256;
- return size;
-}
-#endif

static const struct cpu_dev __cpuinitconst intel_cpu_dev = {
.c_vendor = "Intel",
@@ -498,11 +502,10 @@ static const struct cpu_dev __cpuinitconst intel_cpu_dev = {
},
},
.c_size_cache = intel_size_cache,
-#endif
+#endif /* CONFIG_X86_32 */
.c_early_init = early_init_intel,
.c_init = init_intel,
.c_x86_vendor = X86_VENDOR_INTEL,
};

cpu_dev_register(intel_cpu_dev);
-
--
1.6.0.6



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