Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

Pull x86 cpu changes from Ingo Molnar:
 "The biggest change that stands out is the increase of the
  CONFIG_NR_CPUS range from 4096 to 8192 - as real hardware out there
  already went beyond 4k CPUs ...

  We only allow more than 512 CPUs if offstack cpumasks are enabled.

  CONFIG_MAXSMP=y remains to be the 'you are nuts!' extreme testcase,
  which now means a max of 8192 CPUs"

* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpu: Increase max CPU count to 8192
  x86/cpu: Allow higher NR_CPUS values
  x86/cpu: Always print SMP information in /proc/cpuinfo
  x86/cpu: Track legacy CPU model data only on 32-bit kernels

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5cd6eea..e6dde05 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -826,14 +826,16 @@ config MAXSMP
 config NR_CPUS
        int "Maximum number of CPUs" if SMP && !MAXSMP
        range 2 8 if SMP && X86_32 && !X86_BIGSMP
-       range 2 512 if SMP && !MAXSMP
+       range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
+       range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
        default "1" if !SMP
-       default "4096" if MAXSMP
+       default "8192" if MAXSMP
        default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
        default "8" if SMP
        ---help---
          This allows you to specify the maximum number of CPUs which this
-         kernel will support.  The maximum supported value is 512 and the
+         kernel will support.  If CPUMASK_OFFSTACK is enabled, the maximum
+         supported value is 4096, otherwise the maximum value is 512.  The
          minimum value which makes sense is 2.
 
          This is purely to save memory - each supported CPU adds

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 903a264..3daece7 100644 (file)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -823,8 +823,8 @@ static const struct cpu_dev amd_cpu_dev = {
        .c_vendor       = "AMD",
        .c_ident        = { "AuthenticAMD" },
 #ifdef CONFIG_X86_32
-       .c_models = {
-               { .vendor = X86_VENDOR_AMD, .family = 4, .model_names =
+       .legacy_models = {
+               { .family = 4, .model_names =
                  {
                          [3] = "486 DX/2",
                          [7] = "486 DX/2-WB",
@@ -835,7 +835,7 @@ static const struct cpu_dev amd_cpu_dev = {
                  }
                },
        },
-       .c_size_cache   = amd_size_cache,
+       .legacy_cache_size = amd_size_cache,
 #endif
        .c_early_init   = early_init_amd,
        .c_detect_tlb   = cpu_detect_tlb_amd,

diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c
index fbf6c3b..8d5652d 100644 (file)
--- a/arch/x86/kernel/cpu/centaur.c
+++ b/arch/x86/kernel/cpu/centaur.c
@@ -468,10 +468,10 @@ static void init_centaur(struct cpuinfo_x86 *c)
 #endif
 }
 
+#ifdef CONFIG_X86_32
 static unsigned int
 centaur_size_cache(struct cpuinfo_x86 *c, unsigned int size)
 {
-#ifdef CONFIG_X86_32
        /* VIA C3 CPUs (670-68F) need further shifting. */
        if ((c->x86 == 6) && ((c->x86_model == 7) || (c->x86_model == 8)))
                size >>= 8;
@@ -484,16 +484,18 @@ centaur_size_cache(struct cpuinfo_x86 *c, unsigned int size)
        if ((c->x86 == 6) && (c->x86_model == 9) &&
                                (c->x86_mask == 1) && (size == 65))
                size -= 1;
-#endif
        return size;
 }
+#endif
 
 static const struct cpu_dev centaur_cpu_dev = {
        .c_vendor       = "Centaur",
        .c_ident        = { "CentaurHauls" },
        .c_early_init   = early_init_centaur,
        .c_init         = init_centaur,
-       .c_size_cache   = centaur_size_cache,
+#ifdef CONFIG_X86_32
+       .legacy_cache_size = centaur_size_cache,
+#endif
        .c_x86_vendor   = X86_VENDOR_CENTAUR,
 };
 

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 5223fe6..6abc172 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -346,7 +346,8 @@ static void filter_cpuid_features(struct cpuinfo_x86 *c, bool warn)
 /* Look up CPU names by table lookup. */
 static const char *table_lookup_model(struct cpuinfo_x86 *c)
 {
-       const struct cpu_model_info *info;
+#ifdef CONFIG_X86_32
+       const struct legacy_cpu_model_info *info;
 
        if (c->x86_model >= 16)
                return NULL;    /* Range check */
@@ -354,13 +355,14 @@ static const char *table_lookup_model(struct cpuinfo_x86 *c)
        if (!this_cpu)
                return NULL;
 
-       info = this_cpu->c_models;
+       info = this_cpu->legacy_models;
 
-       while (info && info->family) {
+       while (info->family) {
                if (info->family == c->x86)
                        return info->model_names[c->x86_model];
                info++;
        }
+#endif
        return NULL;            /* Not found */
 }
 
@@ -450,8 +452,8 @@ void cpu_detect_cache_sizes(struct cpuinfo_x86 *c)
        c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
 #else
        /* do processor-specific cache resizing */
-       if (this_cpu->c_size_cache)
-               l2size = this_cpu->c_size_cache(c, l2size);
+       if (this_cpu->legacy_cache_size)
+               l2size = this_cpu->legacy_cache_size(c, l2size);
 
        /* Allow user to override all this if necessary. */
        if (cachesize_override != -1)

diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h
index 4041c24..c37dc37 100644 (file)
--- a/arch/x86/kernel/cpu/cpu.h
+++ b/arch/x86/kernel/cpu/cpu.h
@@ -1,12 +1,6 @@
 #ifndef ARCH_X86_CPU_H
 #define ARCH_X86_CPU_H
 
-struct cpu_model_info {
-       int             vendor;
-       int             family;
-       const char      *model_names[16];
-};
-
 /* attempt to consolidate cpu attributes */
 struct cpu_dev {
        const char      *c_vendor;
@@ -14,15 +8,23 @@ struct cpu_dev {
        /* some have two possibilities for cpuid string */
        const char      *c_ident[2];
 
-       struct          cpu_model_info c_models[4];
-
        void            (*c_early_init)(struct cpuinfo_x86 *);
        void            (*c_bsp_init)(struct cpuinfo_x86 *);
        void            (*c_init)(struct cpuinfo_x86 *);
        void            (*c_identify)(struct cpuinfo_x86 *);
        void            (*c_detect_tlb)(struct cpuinfo_x86 *);
-       unsigned int    (*c_size_cache)(struct cpuinfo_x86 *, unsigned int);
        int             c_x86_vendor;
+#ifdef CONFIG_X86_32
+       /* Optional vendor specific routine to obtain the cache size. */
+       unsigned int    (*legacy_cache_size)(struct cpuinfo_x86 *,
+                                            unsigned int);
+
+       /* Family/stepping-based lookup table for model names. */
+       struct legacy_cpu_model_info {
+               int             family;
+               const char      *model_names[16];
+       }               legacy_models[5];
+#endif
 };
 
 struct _tlb_table {

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index ec72995..dc1ec0d 100644 (file)
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -665,8 +665,8 @@ static const struct cpu_dev intel_cpu_dev = {
        .c_vendor       = "Intel",
        .c_ident        = { "GenuineIntel" },
 #ifdef CONFIG_X86_32
-       .c_models = {
-               { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
+       .legacy_models = {
+               { .family = 4, .model_names =
                  {
                          [0] = "486 DX-25/33",
                          [1] = "486 DX-50",
@@ -679,7 +679,7 @@ static const struct cpu_dev intel_cpu_dev = {
                          [9] = "486 DX/4-WB"
                  }
                },
-               { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
+               { .family = 5, .model_names =
                  {
                          [0] = "Pentium 60/66 A-step",
                          [1] = "Pentium 60/66",
@@ -690,7 +690,7 @@ static const struct cpu_dev intel_cpu_dev = {
                          [8] = "Mobile Pentium MMX"
                  }
                },
-               { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
+               { .family = 6, .model_names =
                  {
                          [0] = "Pentium Pro A-step",
                          [1] = "Pentium Pro",
@@ -704,7 +704,7 @@ static const struct cpu_dev intel_cpu_dev = {
                          [11] = "Pentium III (Tualatin)",
                  }
                },
-               { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
+               { .family = 15, .model_names =
                  {
                          [0] = "Pentium 4 (Unknown)",
                          [1] = "Pentium 4 (Willamette)",
@@ -714,7 +714,7 @@ static const struct cpu_dev intel_cpu_dev = {
                  }
                },
        },
-       .c_size_cache   = intel_size_cache,
+       .legacy_cache_size = intel_size_cache,
 #endif
        .c_detect_tlb   = intel_detect_tlb,
        .c_early_init   = early_init_intel,

diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index aee6317..06fe3ed 100644 (file)
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -11,15 +11,12 @@ static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
                              unsigned int cpu)
 {
 #ifdef CONFIG_SMP
-       if (c->x86_max_cores * smp_num_siblings > 1) {
-               seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
-               seq_printf(m, "siblings\t: %d\n",
-                          cpumask_weight(cpu_core_mask(cpu)));
-               seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
-               seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
-               seq_printf(m, "apicid\t\t: %d\n", c->apicid);
-               seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
-       }
+       seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
+       seq_printf(m, "siblings\t: %d\n", cpumask_weight(cpu_core_mask(cpu)));
+       seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
+       seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
+       seq_printf(m, "apicid\t\t: %d\n", c->apicid);
+       seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
 #endif
 }
 

diff --git a/arch/x86/kernel/cpu/umc.c b/arch/x86/kernel/cpu/umc.c
index 202759a..75c5ad5 100644 (file)
--- a/arch/x86/kernel/cpu/umc.c
+++ b/arch/x86/kernel/cpu/umc.c
@@ -11,8 +11,8 @@
 static const struct cpu_dev umc_cpu_dev = {
        .c_vendor       = "UMC",
        .c_ident        = { "UMC UMC UMC" },
-       .c_models = {
-               { .vendor = X86_VENDOR_UMC, .family = 4, .model_names =
+       .legacy_models  = {
+               { .family = 4, .model_names =
                  {
                          [1] = "U5D",
                          [2] = "U5S",