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x86: move various CPU initialization objects into .cpuinit.rodata

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Impact: debuggability and micro-optimization

Putting whatever is possible into the (final) .rodata section increases
the likelihood of catching memory corruption bugs early, and reduces
false cache line sharing.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
LKML-Reference: <49B90961.76E4.0078.0@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jan Beulich
2009-03-12 12:08:49 +00:00
committed by Ingo Molnar
parent 821508d4ef
commit 02dde8b45c
12 changed files with 36 additions and 35 deletions
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20
arch/x86/kernel/cpu/common.c
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@@ -70,7 +70,7 @@ cpumask_t cpu_sibling_setup_map;
#endif /* CONFIG_X86_32 */
static struct cpu_dev *this_cpu __cpuinitdata;
static const struct cpu_dev *this_cpu __cpuinitdata;
DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page) = { .gdt = {
#ifdef CONFIG_X86_64
@@ -274,9 +274,9 @@ static void __cpuinit filter_cpuid_features(struct cpuinfo_x86 *c, bool warn)
*/
/* Look up CPU names by table lookup. */
static char __cpuinit *table_lookup_model(struct cpuinfo_x86 *c)
static const char *__cpuinit table_lookup_model(struct cpuinfo_x86 *c)
{
struct cpu_model_info *info;
const struct cpu_model_info *info;
if (c->x86_model >= 16)
return NULL; /* Range check */
@@ -321,7 +321,7 @@ void switch_to_new_gdt(int cpu)
load_percpu_segment(cpu);
}
static struct cpu_dev *cpu_devs[X86_VENDOR_NUM] = {};
static const struct cpu_dev *__cpuinitdata cpu_devs[X86_VENDOR_NUM] = {};
static void __cpuinit default_init(struct cpuinfo_x86 *c)
{
@@ -340,7 +340,7 @@ static void __cpuinit default_init(struct cpuinfo_x86 *c)
#endif
}
static struct cpu_dev __cpuinitdata default_cpu = {
static const struct cpu_dev __cpuinitconst default_cpu = {
.c_init = default_init,
.c_vendor = "Unknown",
.c_x86_vendor = X86_VENDOR_UNKNOWN,
@@ -634,12 +634,12 @@ static void __init early_identify_cpu(struct cpuinfo_x86 *c)
void __init early_cpu_init(void)
{
struct cpu_dev **cdev;
const struct cpu_dev *const *cdev;
int count = 0;
printk("KERNEL supported cpus:\n");
for (cdev = __x86_cpu_dev_start; cdev < __x86_cpu_dev_end; cdev++) {
struct cpu_dev *cpudev = *cdev;
const struct cpu_dev *cpudev = *cdev;
unsigned int j;
if (count >= X86_VENDOR_NUM)
@@ -768,7 +768,7 @@ static void __cpuinit identify_cpu(struct cpuinfo_x86 *c)
/* If the model name is still unset, do table lookup. */
if (!c->x86_model_id[0]) {
char *p;
const char *p;
p = table_lookup_model(c);
if (p)
strcpy(c->x86_model_id, p);
@@ -847,7 +847,7 @@ struct msr_range {
unsigned max;
};
static struct msr_range msr_range_array[] __cpuinitdata = {
static const struct msr_range msr_range_array[] __cpuinitconst = {
{ 0x00000000, 0x00000418},
{ 0xc0000000, 0xc000040b},
{ 0xc0010000, 0xc0010142},
@@ -894,7 +894,7 @@ __setup("noclflush", setup_noclflush);
void __cpuinit print_cpu_info(struct cpuinfo_x86 *c)
{
char *vendor = NULL;
const char *vendor = NULL;
if (c->x86_vendor < X86_VENDOR_NUM)
vendor = this_cpu->c_vendor;