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x86: use static _cpu_pda array 

_cpu_pda array first uses statically allocated storage in data.init
and then switches to allocated bootmem to conserve space.  However,
after folding pda area into percpu area, _cpu_pda array will be
removed completely.  Drop the reallocation part to simplify the code
for soon-to-follow changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tejun Heo 2009-01-13 20:41:35 +09:00 committed by Ingo Molnar
parent f32ff5388d
commit c8f3329a0d
4 changed files with 6 additions and 25 deletions
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3
arch/x86/include/asm/pda.h
View File

@ -5,6 +5,7 @@
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/cache.h>
#include <linux/threads.h>
#include <asm/page.h>
/* Per processor datastructure. %gs points to it while the kernel runs */
@ -39,7 +40,7 @@ struct x8664_pda {
unsigned irq_spurious_count;
} ____cacheline_aligned_in_smp;
extern struct x8664_pda **_cpu_pda;
extern struct x8664_pda *_cpu_pda[NR_CPUS];
extern void pda_init(int);
#define cpu_pda(i) (_cpu_pda[i])

2
arch/x86/kernel/cpu/common.c
View File

@ -879,7 +879,7 @@ static __init int setup_disablecpuid(char *arg)
__setup("clearcpuid=", setup_disablecpuid);
#ifdef CONFIG_X86_64
struct x8664_pda **_cpu_pda __read_mostly;
struct x8664_pda *_cpu_pda[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(_cpu_pda);
struct desc_ptr idt_descr = { 256 * 16 - 1, (unsigned long) idt_table };

12
arch/x86/kernel/head64.c
View File

@ -29,20 +29,8 @@
/* boot cpu pda, referenced by head_64.S to initialize %gs for boot CPU */
struct x8664_pda _boot_cpu_pda;
#ifdef CONFIG_SMP
/*
* We install an empty cpu_pda pointer table to indicate to early users
* (numa_set_node) that the cpu_pda pointer table for cpus other than
* the boot cpu is not yet setup.
*/
static struct x8664_pda *__cpu_pda[NR_CPUS] __initdata;
#else
static struct x8664_pda *__cpu_pda[NR_CPUS] __read_mostly;
#endif
void __init x86_64_init_pda(void)
{
_cpu_pda = __cpu_pda;
cpu_pda(0) = &_boot_cpu_pda;
cpu_pda(0)->data_offset =
(unsigned long)(__per_cpu_load - __per_cpu_start);

14
arch/x86/kernel/setup_percpu.c
View File

@ -114,7 +114,6 @@ static inline void setup_cpu_pda_map(void) { }
static void __init setup_cpu_pda_map(void)
{
char *pda;
struct x8664_pda **new_cpu_pda;
unsigned long size;
int cpu;
@ -122,28 +121,21 @@ static void __init setup_cpu_pda_map(void)
/* allocate cpu_pda array and pointer table */
{
unsigned long tsize = nr_cpu_ids * sizeof(void *);
unsigned long asize = size * (nr_cpu_ids - 1);
tsize = roundup(tsize, cache_line_size());
new_cpu_pda = alloc_bootmem(tsize + asize);
pda = (char *)new_cpu_pda + tsize;
pda = alloc_bootmem(asize);
}
/* initialize pointer table to static pda's */
for_each_possible_cpu(cpu) {
if (cpu == 0) {
/* leave boot cpu pda in place */
new_cpu_pda[0] = cpu_pda(0);
continue;
}
new_cpu_pda[cpu] = (struct x8664_pda *)pda;
new_cpu_pda[cpu]->in_bootmem = 1;
cpu_pda(cpu) = (struct x8664_pda *)pda;
cpu_pda(cpu)->in_bootmem = 1;
pda += size;
}
/* point to new pointer table */
_cpu_pda = new_cpu_pda;
}
#endif /* CONFIG_SMP && CONFIG_X86_64 */