[PATCH 0/3] x86/CPUID: CPUID parsing rework, p1

[PATCH 0/3] x86/CPUID: CPUID parsing rework, p1

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Hi all,

this is the beginning of a long conversion. The final goal is to have
one global, read-only CPUID hierarchy representation in arch/x86/ to
replace all the gazillion places where CPUID is read and thus slim a lot
of code. And improve all that X86_FEATURE* diddling. We'll see...

Anyway, these are the first three patches slimming cpuinfo_x86 by
80 bytes per CPU, by making vendor ID and brand name global and
__ro_after_init.

Comments, reviews, etc are welcome, as always.

Thx.

Borislav Petkov (3):
  x86/cpuid: Make cpuinfo_x86.x86_vendor_id global
  x86/cpuid: Get vendor ID on the BSP
  x86/cpuid: Make cpuinfo_x86.x86_model_id global

 arch/x86/include/asm/processor.h     |  6 +--
 arch/x86/kernel/asm-offsets_32.c     |  1 -
 arch/x86/kernel/cpu/amd.c            |  4 +-
 arch/x86/kernel/cpu/centaur.c        |  2 +-
 arch/x86/kernel/cpu/common.c         | 56 +++++++++++++++-------------
 arch/x86/kernel/cpu/cyrix.c          |  7 ++--
 arch/x86/kernel/cpu/intel.c          |  2 +-
 arch/x86/kernel/cpu/proc.c           |  4 +-
 arch/x86/kernel/head_32.S            |  5 ---
 arch/x86/kernel/setup.c              |  3 ++
 drivers/cpufreq/powernow-k8.c        |  2 +-
 drivers/cpufreq/speedstep-centrino.c |  6 +--
 drivers/cpufreq/speedstep-lib.c      |  2 +-
 drivers/edac/e752x_edac.c            |  3 +-
 drivers/hwmon/coretemp.c             |  2 +-
 drivers/hwmon/k10temp.c              |  2 +-
 drivers/platform/x86/intel_ips.c     |  6 +--
 17 files changed, 57 insertions(+), 56 deletions(-)

-- 
2.19.1

[PATCH 1/3] x86/cpuid: Make cpuinfo_x86.x86_vendor_id global

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Make x86_vendor_id __ro_after_init and global as it is not needed
per-CPU. Thus, save 16 bytes of per-CPU memory. Remove the vendor ID
readout early in head_32.S because it is not needed that early either.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/include/asm/processor.h |  4 ++--
 arch/x86/kernel/asm-offsets_32.c |  1 -
 arch/x86/kernel/cpu/common.c     | 15 +++++++--------
 arch/x86/kernel/cpu/cyrix.c      |  2 +-
 arch/x86/kernel/cpu/proc.c       |  2 +-
 arch/x86/kernel/head_32.S        |  5 -----
 arch/x86/kernel/setup.c          |  1 +
 7 files changed, 12 insertions(+), 18 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 071b2a6fff85..2f6f7939dfe0 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -69,12 +69,13 @@ extern u16 __read_mostly tlb_lld_2m[NR_INFO];
 extern u16 __read_mostly tlb_lld_4m[NR_INFO];
 extern u16 __read_mostly tlb_lld_1g[NR_INFO];
 
+extern char x86_vendor_id[16];
+
 /*
  *  CPU type and hardware bug flags. Kept separately for each CPU.
  *  Members of this structure are referenced in head_32.S, so think twice
  *  before touching them. [mj]
  */
-
 struct cpuinfo_x86 {
 	__u8			x86;		/* CPU family */
 	__u8			x86_vendor;	/* CPU vendor */
@@ -94,7 +95,6 @@ struct cpuinfo_x86 {
 	/* Maximum supported CPUID level, -1=no CPUID: */
 	int			cpuid_level;
 	__u32			x86_capability[NCAPINTS + NBUGINTS];
-	char			x86_vendor_id[16];
 	char			x86_model_id[64];
 	/* in KB - valid for CPUS which support this call: */
 	unsigned int		x86_cache_size;
diff --git a/arch/x86/kernel/asm-offsets_32.c b/arch/x86/kernel/asm-offsets_32.c
index 82826f2275cc..0b577c40c710 100644
--- a/arch/x86/kernel/asm-offsets_32.c
+++ b/arch/x86/kernel/asm-offsets_32.c
@@ -21,7 +21,6 @@ void foo(void)
 	OFFSET(CPUINFO_x86_stepping, cpuinfo_x86, x86_stepping);
 	OFFSET(CPUINFO_cpuid_level, cpuinfo_x86, cpuid_level);
 	OFFSET(CPUINFO_x86_capability, cpuinfo_x86, x86_capability);
-	OFFSET(CPUINFO_x86_vendor_id, cpuinfo_x86, x86_vendor_id);
 	BLANK();
 
 	OFFSET(PT_EBX, pt_regs, bx);
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index ffb181f959d2..8a6071614652 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -708,7 +708,7 @@ void detect_ht(struct cpuinfo_x86 *c)
 
 static void get_cpu_vendor(struct cpuinfo_x86 *c)
 {
-	char *v = c->x86_vendor_id;
+	char *v = x86_vendor_id;
 	int i;
 
 	for (i = 0; i < X86_VENDOR_NUM; i++) {
@@ -736,9 +736,9 @@ void cpu_detect(struct cpuinfo_x86 *c)
 {
 	/* Get vendor name */
 	cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
-	      (unsigned int *)&c->x86_vendor_id[0],
-	      (unsigned int *)&c->x86_vendor_id[8],
-	      (unsigned int *)&c->x86_vendor_id[4]);
+	      (unsigned int *)&x86_vendor_id[0],
+	      (unsigned int *)&x86_vendor_id[8],
+	      (unsigned int *)&x86_vendor_id[4]);
 
 	c->x86 = 4;
 	/* Intel-defined flags: level 0x00000001 */
@@ -938,9 +938,9 @@ static void identify_cpu_without_cpuid(struct cpuinfo_x86 *c)
 
 	for (i = 0; i < X86_VENDOR_NUM; i++)
 		if (cpu_devs[i] && cpu_devs[i]->c_identify) {
-			c->x86_vendor_id[0] = 0;
+			x86_vendor_id[0] = 0;
 			cpu_devs[i]->c_identify(c);
-			if (c->x86_vendor_id[0]) {
+			if (x86_vendor_id[0]) {
 				get_cpu_vendor(c);
 				break;
 			}
@@ -1301,7 +1301,6 @@ static void identify_cpu(struct cpuinfo_x86 *c)
 	c->x86_cache_size = 0;
 	c->x86_vendor = X86_VENDOR_UNKNOWN;
 	c->x86_model = c->x86_stepping = 0;	/* So far unknown... */
-	c->x86_vendor_id[0] = '\0'; /* Unset */
 	c->x86_model_id[0] = '\0';  /* Unset */
 	c->x86_max_cores = 1;
 	c->x86_coreid_bits = 0;
@@ -1480,7 +1479,7 @@ void print_cpu_info(struct cpuinfo_x86 *c)
 		vendor = this_cpu->c_vendor;
 	} else {
 		if (c->cpuid_level >= 0)
-			vendor = c->x86_vendor_id;
+			vendor = x86_vendor_id;
 	}
 
 	if (vendor && !strstr(c->x86_model_id, vendor))
diff --git a/arch/x86/kernel/cpu/cyrix.c b/arch/x86/kernel/cpu/cyrix.c
index d12226f60168..1f1f724dd4c3 100644
--- a/arch/x86/kernel/cpu/cyrix.c
+++ b/arch/x86/kernel/cpu/cyrix.c
@@ -415,7 +415,7 @@ static void cyrix_identify(struct cpuinfo_x86 *c)
 	if (c->x86 == 4 && test_cyrix_52div()) {
 		unsigned char dir0, dir1;
 
-		strcpy(c->x86_vendor_id, "CyrixInstead");
+		strcpy(x86_vendor_id, "CyrixInstead");
 		c->x86_vendor = X86_VENDOR_CYRIX;
 
 		/* Actually enable cpuid on the older cyrix */
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index 2c8522a39ed5..999371ddfedb 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -67,7 +67,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		   "model\t\t: %u\n"
 		   "model name\t: %s\n",
 		   cpu,
-		   c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
+		   x86_vendor_id[0] ? x86_vendor_id : "unknown",
 		   c->x86,
 		   c->x86_model,
 		   c->x86_model_id[0] ? c->x86_model_id : "unknown");
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 30f9cb2c0b55..7ee8a1325abe 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -41,8 +41,6 @@
 #define X86_HARD_MATH	new_cpu_data+CPUINFO_hard_math
 #define X86_CPUID	new_cpu_data+CPUINFO_cpuid_level
 #define X86_CAPABILITY	new_cpu_data+CPUINFO_x86_capability
-#define X86_VENDOR_ID	new_cpu_data+CPUINFO_x86_vendor_id
-
 
 #define SIZEOF_PTREGS 17*4
 
@@ -316,9 +314,6 @@ ENTRY(startup_32_smp)
 	xorl %eax,%eax			# call CPUID with 0 -> return vendor ID
 	cpuid
 	movl %eax,X86_CPUID		# save CPUID level
-	movl %ebx,X86_VENDOR_ID		# lo 4 chars
-	movl %edx,X86_VENDOR_ID+4	# next 4 chars
-	movl %ecx,X86_VENDOR_ID+8	# last 4 chars
 
 	orl %eax,%eax			# do we have processor info as well?
 	je .Lis486
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index b74e7bfed6ab..9f21f595f0de 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -161,6 +161,7 @@ static struct resource bss_resource = {
 	.flags	= IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
 };
 
+char x86_vendor_id[16] __ro_after_init;
 
 #ifdef CONFIG_X86_32
 /* cpu data as detected by the assembly code in head_32.S */
-- 
2.19.1

[PATCH 2/3] x86/cpuid: Get vendor ID on the BSP

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

No need to do it on each CPU. Read max base CPUID level on each CPU for
now so that the check in cpu_detect() works.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/kernel/cpu/common.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 8a6071614652..f77ca116fba7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -732,15 +732,21 @@ static void get_cpu_vendor(struct cpuinfo_x86 *c)
 	this_cpu = &default_cpu;
 }
 
-void cpu_detect(struct cpuinfo_x86 *c)
+static void cpu_get_vendor_name(void)
 {
-	/* Get vendor name */
-	cpuid(0x00000000, (unsigned int *)&c->cpuid_level,
+	u32 dummy;
+
+	cpuid(0x00000000, &dummy,
 	      (unsigned int *)&x86_vendor_id[0],
 	      (unsigned int *)&x86_vendor_id[8],
 	      (unsigned int *)&x86_vendor_id[4]);
+}
 
+void cpu_detect(struct cpuinfo_x86 *c)
+{
+	c->cpuid_level = cpuid_eax(0);
 	c->x86 = 4;
+
 	/* Intel-defined flags: level 0x00000001 */
 	if (c->cpuid_level >= 0x00000001) {
 		u32 junk, tfms, cap0, misc;
@@ -1082,6 +1088,7 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 
 	/* cyrix could have cpuid enabled via c_identify()*/
 	if (have_cpuid_p()) {
+		cpu_get_vendor_name();
 		cpu_detect(c);
 		get_cpu_vendor(c);
 		get_cpu_cap(c);
-- 
2.19.1

[PATCH 3/3] x86/cpuid: Make cpuinfo_x86.x86_model_id global

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

... and __ro_after_init. Since the brand string is being read earlier
now, in early_identify_cpu(), get_model_name() needs to read out the
extended CPUID level for the brand string. This is temporary only, until
the full CPUID read out has been added.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: linux-pm@vger.kernel.org
Cc: linux-edac@vger.kernel.org
Cc: linux-hwmon@vger.kernel.org
Cc: platform-driver-x86@vger.kernel.org
---
 arch/x86/include/asm/processor.h     |  2 +-
 arch/x86/kernel/cpu/amd.c            |  4 ++--
 arch/x86/kernel/cpu/centaur.c        |  2 +-
 arch/x86/kernel/cpu/common.c         | 28 ++++++++++++++--------------
 arch/x86/kernel/cpu/cyrix.c          |  5 ++---
 arch/x86/kernel/cpu/intel.c          |  2 +-
 arch/x86/kernel/cpu/proc.c           |  2 +-
 arch/x86/kernel/setup.c              |  2 ++
 drivers/cpufreq/powernow-k8.c        |  2 +-
 drivers/cpufreq/speedstep-centrino.c |  6 +++---
 drivers/cpufreq/speedstep-lib.c      |  2 +-
 drivers/edac/e752x_edac.c            |  3 +--
 drivers/hwmon/coretemp.c             |  2 +-
 drivers/hwmon/k10temp.c              |  2 +-
 drivers/platform/x86/intel_ips.c     |  6 +++---
 15 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 2f6f7939dfe0..ace1f364fb0c 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -70,6 +70,7 @@ extern u16 __read_mostly tlb_lld_4m[NR_INFO];
 extern u16 __read_mostly tlb_lld_1g[NR_INFO];
 
 extern char x86_vendor_id[16];
+extern char x86_model_id[64];
 
 /*
  *  CPU type and hardware bug flags. Kept separately for each CPU.
@@ -95,7 +96,6 @@ struct cpuinfo_x86 {
 	/* Maximum supported CPUID level, -1=no CPUID: */
 	int			cpuid_level;
 	__u32			x86_capability[NCAPINTS + NBUGINTS];
-	char			x86_model_id[64];
 	/* in KB - valid for CPUS which support this call: */
 	unsigned int		x86_cache_size;
 	int			x86_cache_alignment;	/* In bytes */
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index eeea634bee0a..47aedc1240a2 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -737,8 +737,8 @@ static void init_amd_k8(struct cpuinfo_x86 *c)
 		}
 	}
 
-	if (!c->x86_model_id[0])
-		strcpy(c->x86_model_id, "Hammer");
+	if (!x86_model_id[0])
+		strcpy(x86_model_id, "Hammer");
 
 #ifdef CONFIG_SMP
 	/*
diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c
index 14433ff5b828..bab43a1588bc 100644
--- a/arch/x86/kernel/cpu/centaur.c
+++ b/arch/x86/kernel/cpu/centaur.c
@@ -239,7 +239,7 @@ static void init_centaur(struct cpuinfo_x86 *c)
 			/* Add L1 data and code cache sizes. */
 			c->x86_cache_size = (cc>>24)+(dd>>24);
 		}
-		sprintf(c->x86_model_id, "WinChip %s", name);
+		sprintf(x86_model_id, "WinChip %s", name);
 		break;
 #endif
 	case 6:
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index f77ca116fba7..0a96b6d56f13 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -95,9 +95,9 @@ static void default_init(struct cpuinfo_x86 *c)
 	if (c->cpuid_level == -1) {
 		/* No cpuid. It must be an ancient CPU */
 		if (c->x86 == 4)
-			strcpy(c->x86_model_id, "486");
+			strcpy(x86_model_id, "486");
 		else if (c->x86 == 3)
-			strcpy(c->x86_model_id, "386");
+			strcpy(x86_model_id, "386");
 	}
 #endif
 }
@@ -561,17 +561,18 @@ static void get_model_name(struct cpuinfo_x86 *c)
 	unsigned int *v;
 	char *p, *q, *s;
 
+	c->extended_cpuid_level = cpuid_eax(0x80000000);
 	if (c->extended_cpuid_level < 0x80000004)
 		return;
 
-	v = (unsigned int *)c->x86_model_id;
+	v = (unsigned int *)x86_model_id;
 	cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]);
 	cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]);
 	cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]);
-	c->x86_model_id[48] = 0;
+	x86_model_id[48] = 0;
 
 	/* Trim whitespace */
-	p = q = s = &c->x86_model_id[0];
+	p = q = s = x86_model_id;
 
 	while (*p == ' ')
 		p++;
@@ -1089,6 +1090,7 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
 	/* cyrix could have cpuid enabled via c_identify()*/
 	if (have_cpuid_p()) {
 		cpu_get_vendor_name();
+		get_model_name(c);
 		cpu_detect(c);
 		get_cpu_vendor(c);
 		get_cpu_cap(c);
@@ -1232,8 +1234,6 @@ static void generic_identify(struct cpuinfo_x86 *c)
 		c->phys_proc_id = c->initial_apicid;
 	}
 
-	get_model_name(c); /* Default name */
-
 	detect_null_seg_behavior(c);
 
 	/*
@@ -1308,7 +1308,6 @@ static void identify_cpu(struct cpuinfo_x86 *c)
 	c->x86_cache_size = 0;
 	c->x86_vendor = X86_VENDOR_UNKNOWN;
 	c->x86_model = c->x86_stepping = 0;	/* So far unknown... */
-	c->x86_model_id[0] = '\0';  /* Unset */
 	c->x86_max_cores = 1;
 	c->x86_coreid_bits = 0;
 	c->cu_id = 0xff;
@@ -1367,14 +1366,15 @@ static void identify_cpu(struct cpuinfo_x86 *c)
 	filter_cpuid_features(c, true);
 
 	/* If the model name is still unset, do table lookup. */
-	if (!c->x86_model_id[0]) {
+	if (!x86_model_id[0]) {
 		const char *p;
+
 		p = table_lookup_model(c);
 		if (p)
-			strcpy(c->x86_model_id, p);
+			strcpy(x86_model_id, p);
 		else
 			/* Last resort... */
-			sprintf(c->x86_model_id, "%02x/%02x",
+			sprintf(x86_model_id, "%02x/%02x",
 				c->x86, c->x86_model);
 	}
 
@@ -1489,11 +1489,11 @@ void print_cpu_info(struct cpuinfo_x86 *c)
 			vendor = x86_vendor_id;
 	}
 
-	if (vendor && !strstr(c->x86_model_id, vendor))
+	if (vendor && !strstr(x86_model_id, vendor))
 		pr_cont("%s ", vendor);
 
-	if (c->x86_model_id[0])
-		pr_cont("%s", c->x86_model_id);
+	if (x86_model_id[0])
+		pr_cont("%s", x86_model_id);
 	else
 		pr_cont("%d86", c->x86);
 
diff --git a/arch/x86/kernel/cpu/cyrix.c b/arch/x86/kernel/cpu/cyrix.c
index 1f1f724dd4c3..e5394251175c 100644
--- a/arch/x86/kernel/cpu/cyrix.c
+++ b/arch/x86/kernel/cpu/cyrix.c
@@ -191,7 +191,6 @@ static void early_init_cyrix(struct cpuinfo_x86 *c)
 static void init_cyrix(struct cpuinfo_x86 *c)
 {
 	unsigned char dir0, dir0_msn, dir0_lsn, dir1 = 0;
-	char *buf = c->x86_model_id;
 	const char *p = NULL;
 
 	/*
@@ -351,9 +350,9 @@ static void init_cyrix(struct cpuinfo_x86 *c)
 		dir0_msn = 7;
 		break;
 	}
-	strcpy(buf, Cx86_model[dir0_msn & 7]);
+	strcpy(x86_model_id, Cx86_model[dir0_msn & 7]);
 	if (p)
-		strcat(buf, p);
+		strcat(x86_model_id, p);
 	return;
 }
 
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index fc3c07fe7df5..f18115779e07 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -745,7 +745,7 @@ static void init_intel(struct cpuinfo_x86 *c)
 		}
 
 		if (p)
-			strcpy(c->x86_model_id, p);
+			strcpy(x86_model_id, p);
 	}
 
 	if (c->x86 == 15)
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index 999371ddfedb..d048b22cb304 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -70,7 +70,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		   x86_vendor_id[0] ? x86_vendor_id : "unknown",
 		   c->x86,
 		   c->x86_model,
-		   c->x86_model_id[0] ? c->x86_model_id : "unknown");
+		   x86_model_id[0] ? x86_model_id : "unknown");
 
 	if (c->x86_stepping || c->cpuid_level >= 0)
 		seq_printf(m, "stepping\t: %d\n", c->x86_stepping);
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 9f21f595f0de..21c372c66498 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -162,6 +162,8 @@ static struct resource bss_resource = {
 };
 
 char x86_vendor_id[16] __ro_after_init;
+char x86_model_id[64] __ro_after_init;
+EXPORT_SYMBOL_GPL(x86_model_id);
 
 #ifdef CONFIG_X86_32
 /* cpu data as detected by the assembly code in head_32.S */
diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
index fb77b39a4ce3..476bbca2fd43 100644
--- a/drivers/cpufreq/powernow-k8.c
+++ b/drivers/cpufreq/powernow-k8.c
@@ -1204,7 +1204,7 @@ static int powernowk8_init(void)
 		return ret;
 
 	pr_info("Found %d %s (%d cpu cores) (" VERSION ")\n",
-		num_online_nodes(), boot_cpu_data.x86_model_id, supported_cpus);
+		num_online_nodes(), x86_model_id, supported_cpus);
 
 	return ret;
 }
diff --git a/drivers/cpufreq/speedstep-centrino.c b/drivers/cpufreq/speedstep-centrino.c
index a1fb735685db..c0385ffb2732 100644
--- a/drivers/cpufreq/speedstep-centrino.c
+++ b/drivers/cpufreq/speedstep-centrino.c
@@ -238,21 +238,21 @@ static int centrino_cpu_init_table(struct cpufreq_policy *policy)
 	for(model = models; model->cpu_id != NULL; model++)
 		if (centrino_verify_cpu_id(cpu, model->cpu_id) &&
 		    (model->model_name == NULL ||
-		     strcmp(cpu->x86_model_id, model->model_name) == 0))
+		     strcmp(x86_model_id, model->model_name) == 0))
 			break;
 
 	if (model->cpu_id == NULL) {
 		/* No match at all */
 		pr_debug("no support for CPU model \"%s\": "
 		       "send /proc/cpuinfo to " MAINTAINER "\n",
-		       cpu->x86_model_id);
+		       x86_model_id);
 		return -ENOENT;
 	}
 
 	if (model->op_points == NULL) {
 		/* Matched a non-match */
 		pr_debug("no table support for CPU model \"%s\"\n",
-		       cpu->x86_model_id);
+		       x86_model_id);
 		pr_debug("try using the acpi-cpufreq driver\n");
 		return -ENOENT;
 	}
diff --git a/drivers/cpufreq/speedstep-lib.c b/drivers/cpufreq/speedstep-lib.c
index cabb6f48eb77..aa83496f8734 100644
--- a/drivers/cpufreq/speedstep-lib.c
+++ b/drivers/cpufreq/speedstep-lib.c
@@ -312,7 +312,7 @@ enum speedstep_processor speedstep_detect_processor(void)
 			 * string
 			 */
 			if ((ebx == 0x0e) ||
-				(strstr(c->x86_model_id,
+				(strstr(x86_model_id,
 				    "Mobile Intel(R) Pentium(R) 4") != NULL))
 				return SPEEDSTEP_CPU_P4M;
 			break;
diff --git a/drivers/edac/e752x_edac.c b/drivers/edac/e752x_edac.c
index b5de9a13ea3f..76304cbcd55d 100644
--- a/drivers/edac/e752x_edac.c
+++ b/drivers/edac/e752x_edac.c
@@ -1211,14 +1211,13 @@ static int e752x_get_devs(struct pci_dev *pdev, int dev_idx,
  */
 static void e752x_init_sysbus_parity_mask(struct e752x_pvt *pvt)
 {
-	char *cpu_id = cpu_data(0).x86_model_id;
 	struct pci_dev *dev = pvt->dev_d0f1;
 	int enable = 1;
 
 	/* Allow module parameter override, else see if CPU supports parity */
 	if (sysbus_parity != -1) {
 		enable = sysbus_parity;
-	} else if (cpu_id[0] && !strstr(cpu_id, "Xeon")) {
+	} else if (x86_model_id[0] && !strstr(x86_model_id, "Xeon")) {
 		e752x_printk(KERN_INFO, "System Bus Parity not "
 			     "supported by CPU, disabling\n");
 		enable = 0;
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 10645c9bb7be..b3e444975930 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -262,7 +262,7 @@ static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
 	}
 
 	for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
-		if (strstr(c->x86_model_id, tjmax_table[i].id))
+		if (strstr(x86_model_id, tjmax_table[i].id))
 			return tjmax_table[i].tjmax;
 	}
 
diff --git a/drivers/hwmon/k10temp.c b/drivers/hwmon/k10temp.c
index 2cef0c37ff6f..1057c14b50c9 100644
--- a/drivers/hwmon/k10temp.c
+++ b/drivers/hwmon/k10temp.c
@@ -343,7 +343,7 @@ static int k10temp_probe(struct pci_dev *pdev,
 		const struct tctl_offset *entry = &tctl_offset_table[i];
 
 		if (boot_cpu_data.x86 == entry->model &&
-		    strstr(boot_cpu_data.x86_model_id, entry->id)) {
+		    strstr(x86_model_id, entry->id)) {
 			data->temp_offset = entry->offset;
 			break;
 		}
diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c
index 225638a1b09e..4309f198cbad 100644
--- a/drivers/platform/x86/intel_ips.c
+++ b/drivers/platform/x86/intel_ips.c
@@ -1367,11 +1367,11 @@ static struct ips_mcp_limits *ips_detect_cpu(struct ips_driver *ips)
 	else
 		ips->turbo_toggle_allowed = false;
 
-	if (strstr(boot_cpu_data.x86_model_id, "CPU       M"))
+	if (strstr(x86_model_id, "CPU       M"))
 		limits = &ips_sv_limits;
-	else if (strstr(boot_cpu_data.x86_model_id, "CPU       L"))
+	else if (strstr(x86_model_id, "CPU       L"))
 		limits = &ips_lv_limits;
-	else if (strstr(boot_cpu_data.x86_model_id, "CPU       U"))
+	else if (strstr(x86_model_id, "CPU       U"))
 		limits = &ips_ulv_limits;
 	else {
 		dev_info(ips->dev, "No CPUID match found.\n");
-- 
2.19.1

Re: [PATCH 3/3] x86/cpuid: Make cpuinfo_x86.x86_model_id global

[Andy Shevchenko]

On Wed, Nov 14, 2018 at 11:29 PM Borislav Petkov <bp@alien8.de> wrote:
>
> From: Borislav Petkov <bp@suse.de>
>
> ... and __ro_after_init. Since the brand string is being read earlier
> now, in early_identify_cpu(), get_model_name() needs to read out the
> extended CPUID level for the brand string. This is temporary only, until
> the full CPUID read out has been added.

>  drivers/platform/x86/intel_ips.c     |  6 +++---
>  15 files changed, 35 insertions(+), 35 deletions(-)



> diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c
> index 225638a1b09e..4309f198cbad 100644
> --- a/drivers/platform/x86/intel_ips.c
> +++ b/drivers/platform/x86/intel_ips.c
> @@ -1367,11 +1367,11 @@ static struct ips_mcp_limits *ips_detect_cpu(struct ips_driver *ips)
>         else
>                 ips->turbo_toggle_allowed = false;
>
> -       if (strstr(boot_cpu_data.x86_model_id, "CPU       M"))
> +       if (strstr(x86_model_id, "CPU       M"))
>                 limits = &ips_sv_limits;
> -       else if (strstr(boot_cpu_data.x86_model_id, "CPU       L"))
> +       else if (strstr(x86_model_id, "CPU       L"))
>                 limits = &ips_lv_limits;
> -       else if (strstr(boot_cpu_data.x86_model_id, "CPU       U"))
> +       else if (strstr(x86_model_id, "CPU       U"))
>                 limits = &ips_ulv_limits;
>         else {
>                 dev_info(ips->dev, "No CPUID match found.\n");

Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>

for PDx86 bits

--
With Best Regards,
Andy Shevchenko