x86: cache_info: Kill the moronic shadow struct

Commit f9b90566c ("x86: reduce stack usage in init_intel_cacheinfo")
introduced a shadow structure to reduce the stack usage on large
machines instead of making the smaller structure embedded into the
large one. That's definitely a candidate for the bad taste award.

Move the small struct into the large one and get rid of the ugly type
casts.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Hans Rosenfeld <hans.rosenfeld@amd.com>
Cc: Borislav Petkov <borislav.petkov@amd.com>
Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Mike Travis <travis@sgi.com>
Link: http://lkml.kernel.org/r/20110723212626.625651773@linutronix.de
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 22 insertions, 38 deletions

diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index aa27c38fa98d..311322bb712a 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -157,22 +157,17 @@ struct amd_l3_cache {
         u8       subcaches[4];
 };
 
-struct _cpuid4_info {
+struct _cpuid4_info_regs {
         union _cpuid4_leaf_eax eax;
         union _cpuid4_leaf_ebx ebx;
         union _cpuid4_leaf_ecx ecx;
         unsigned long size;
         struct amd_l3_cache *l3;
-        DECLARE_BITMAP(shared_cpu_map, NR_CPUS);
 };
 
-/* subset of above _cpuid4_info w/o shared_cpu_map */
-struct _cpuid4_info_regs {
-        union _cpuid4_leaf_eax eax;
-        union _cpuid4_leaf_ebx ebx;
-        union _cpuid4_leaf_ecx ecx;
-        unsigned long size;
-        struct amd_l3_cache *l3;
+struct _cpuid4_info {
+        struct _cpuid4_info_regs base;
+        DECLARE_BITMAP(shared_cpu_map, NR_CPUS);
 };
 
 unsigned short                  num_cache_leaves;
@@ -387,11 +382,10 @@ static ssize_t show_cache_disable(struct _cpuid4_info *this_leaf, char *buf,
 {
         int index;
 
-        if (!this_leaf->l3 ||
-            !amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
+        if (!this_leaf->base.l3 || !amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
                 return -EINVAL;
 
-        index = amd_get_l3_disable_slot(this_leaf->l3, slot);
+        index = amd_get_l3_disable_slot(this_leaf->base.l3, slot);
         if (index >= 0)
                 return sprintf(buf, "%d\n", index);
 
@@ -480,8 +474,7 @@ static ssize_t store_cache_disable(struct _cpuid4_info *this_leaf,
         if (!capable(CAP_SYS_ADMIN))
                 return -EPERM;
 
-        if (!this_leaf->l3 ||
-            !amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
+        if (!this_leaf->base.l3 || !amd_nb_has_feature(AMD_NB_L3_INDEX_DISABLE))
                 return -EINVAL;
 
         cpu = cpumask_first(to_cpumask(this_leaf->shared_cpu_map));
@@ -489,7 +482,7 @@ static ssize_t store_cache_disable(struct _cpuid4_info *this_leaf,
         if (strict_strtoul(buf, 10, &val) < 0)
                 return -EINVAL;
 
-        err = amd_set_l3_disable_slot(this_leaf->l3, cpu, slot, val);
+        err = amd_set_l3_disable_slot(this_leaf->base.l3, cpu, slot, val);
         if (err) {
                 if (err == -EEXIST)
                         printk(KERN_WARNING "L3 disable slot %d in use!\n",
@@ -518,7 +511,7 @@ static struct _cache_attr cache_disable_1 = __ATTR(cache_disable_1, 0644,
 static ssize_t
 show_subcaches(struct _cpuid4_info *this_leaf, char *buf, unsigned int cpu)
 {
-        if (!this_leaf->l3 || !amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
+        if (!this_leaf->base.l3 || !amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
                 return -EINVAL;
 
         return sprintf(buf, "%x\n", amd_get_subcaches(cpu));
@@ -533,7 +526,7 @@ store_subcaches(struct _cpuid4_info *this_leaf, const char *buf, size_t count,
         if (!capable(CAP_SYS_ADMIN))
                 return -EPERM;
 
-        if (!this_leaf->l3 || !amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
+        if (!this_leaf->base.l3 || !amd_nb_has_feature(AMD_NB_L3_PARTITIONING))
                 return -EINVAL;
 
         if (strict_strtoul(buf, 16, &val) < 0)
@@ -769,7 +762,7 @@ static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
                 return;
         }
         this_leaf = CPUID4_INFO_IDX(cpu, index);
-        num_threads_sharing = 1 + this_leaf->eax.split.num_threads_sharing;
+        num_threads_sharing = 1 + this_leaf->base.eax.split.num_threads_sharing;
 
         if (num_threads_sharing == 1)
                 cpumask_set_cpu(cpu, to_cpumask(this_leaf->shared_cpu_map));
@@ -824,24 +817,15 @@ static void __cpuinit free_cache_attributes(unsigned int cpu)
         per_cpu(ici_cpuid4_info, cpu) = NULL;
 }
 
-static int
-__cpuinit cpuid4_cache_lookup(int index, struct _cpuid4_info *this_leaf)
-{
-        struct _cpuid4_info_regs *leaf_regs =
-                (struct _cpuid4_info_regs *)this_leaf;
-
-        return cpuid4_cache_lookup_regs(index, leaf_regs);
-}
-
 static void __cpuinit get_cpu_leaves(void *_retval)
 {
         int j, *retval = _retval, cpu = smp_processor_id();
 
         /* Do cpuid and store the results */
         for (j = 0; j < num_cache_leaves; j++) {
-                struct _cpuid4_info *this_leaf;
-                this_leaf = CPUID4_INFO_IDX(cpu, j);
-                *retval = cpuid4_cache_lookup(j, this_leaf);
+                struct _cpuid4_info *this_leaf = CPUID4_INFO_IDX(cpu, j);
+
+                *retval = cpuid4_cache_lookup_regs(j, &this_leaf->base);
                 if (unlikely(*retval < 0)) {
                         int i;
 
@@ -899,16 +883,16 @@ static ssize_t show_##file_name(struct _cpuid4_info *this_leaf, char *buf, \
         return sprintf(buf, "%lu\n", (unsigned long)this_leaf->object + val); \
 }
 
-show_one_plus(level, eax.split.level, 0);
-show_one_plus(coherency_line_size, ebx.split.coherency_line_size, 1);
-show_one_plus(physical_line_partition, ebx.split.physical_line_partition, 1);
-show_one_plus(ways_of_associativity, ebx.split.ways_of_associativity, 1);
-show_one_plus(number_of_sets, ecx.split.number_of_sets, 1);
+show_one_plus(level, base.eax.split.level, 0);
+show_one_plus(coherency_line_size, base.ebx.split.coherency_line_size, 1);
+show_one_plus(physical_line_partition, base.ebx.split.physical_line_partition, 1);
+show_one_plus(ways_of_associativity, base.ebx.split.ways_of_associativity, 1);
+show_one_plus(number_of_sets, base.ecx.split.number_of_sets, 1);
 
 static ssize_t show_size(struct _cpuid4_info *this_leaf, char *buf,
                          unsigned int cpu)
 {
-        return sprintf(buf, "%luK\n", this_leaf->size / 1024);
+        return sprintf(buf, "%luK\n", this_leaf->base.size / 1024);
 }
 
 static ssize_t show_shared_cpu_map_func(struct _cpuid4_info *this_leaf,
@@ -945,7 +929,7 @@ static inline ssize_t show_shared_cpu_list(struct _cpuid4_info *leaf, char *buf,
 static ssize_t show_type(struct _cpuid4_info *this_leaf, char *buf,
                          unsigned int cpu)
 {
-        switch (this_leaf->eax.split.type) {
+        switch (this_leaf->base.eax.split.type) {
         case CACHE_TYPE_DATA:
                 return sprintf(buf, "Data\n");
         case CACHE_TYPE_INST:
@@ -1134,7 +1118,7 @@ static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
 
                 ktype_cache.default_attrs = default_attrs;
 #ifdef CONFIG_AMD_NB
-                if (this_leaf->l3)
+                if (this_leaf->base.l3)
                         ktype_cache.default_attrs = amd_l3_attrs();
 #endif
                 retval = kobject_init_and_add(&(this_object->kobj),