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x86-64: Move cpu number from PDA to per-cpu and consolidate with 32-bit. 

tj: moved cpu_number definition out of CONFIG_HAVE_SETUP_PER_CPU_AREA
    for voyager.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Brian Gerst 2009-01-19 00:38:58 +09:00 committed by Tejun Heo
parent 92d65b2371
commit ea9279066d
7 changed files with 12 additions and 11 deletions
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2
arch/x86/include/asm/pda.h
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@ -16,7 +16,7 @@ struct x8664_pda {
unsigned long kernelstack; /* 16 top of kernel stack for current */
unsigned long oldrsp; /* 24 user rsp for system call */
int irqcount; /* 32 Irq nesting counter. Starts -1 */
unsigned int cpunumber; /* 36 Logical CPU number */
unsigned int unused6; /* 36 was cpunumber */
#ifdef CONFIG_CC_STACKPROTECTOR
unsigned long stack_canary; /* 40 stack canary value */
/* gcc-ABI: this canary MUST be at

4
arch/x86/include/asm/smp.h
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@ -25,9 +25,7 @@ extern unsigned int num_processors;
DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
DECLARE_PER_CPU(cpumask_t, cpu_core_map);
DECLARE_PER_CPU(u16, cpu_llc_id);
#ifdef CONFIG_X86_32
DECLARE_PER_CPU(int, cpu_number);
#endif
static inline struct cpumask *cpu_sibling_mask(int cpu)
{
@ -164,7 +162,7 @@ extern unsigned disabled_cpus __cpuinitdata;
extern int safe_smp_processor_id(void);
#elif defined(CONFIG_X86_64_SMP)
#define raw_smp_processor_id() read_pda(cpunumber)
#define raw_smp_processor_id() (percpu_read(cpu_number))
#define stack_smp_processor_id() \
({ \

1
arch/x86/kernel/asm-offsets_64.c
View File

@ -53,7 +53,6 @@ int main(void)
ENTRY(oldrsp);
ENTRY(pcurrent);
ENTRY(irqcount);
ENTRY(cpunumber);
DEFINE(pda_size, sizeof(struct x8664_pda));
BLANK();
#undef ENTRY

1
arch/x86/kernel/cpu/common.c
View File

@ -899,7 +899,6 @@ void __cpuinit pda_init(int cpu)
load_pda_offset(cpu);
pda->cpunumber = cpu;
pda->irqcount = -1;
pda->kernelstack = (unsigned long)stack_thread_info() -
PDA_STACKOFFSET + THREAD_SIZE;

3
arch/x86/kernel/process_32.c
View File

@ -66,9 +66,6 @@ asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task;
EXPORT_PER_CPU_SYMBOL(current_task);
DEFINE_PER_CPU(int, cpu_number);
EXPORT_PER_CPU_SYMBOL(cpu_number);
/*
* Return saved PC of a blocked thread.
*/

10
arch/x86/kernel/setup_percpu.c
View File

@ -22,6 +22,15 @@
# define DBG(x...)
#endif
/*
* Could be inside CONFIG_HAVE_SETUP_PER_CPU_AREA with other stuff but
* voyager wants cpu_number too.
*/
#ifdef CONFIG_SMP
DEFINE_PER_CPU(int, cpu_number);
EXPORT_PER_CPU_SYMBOL(cpu_number);
#endif
#ifdef CONFIG_X86_LOCAL_APIC
unsigned int num_processors;
unsigned disabled_cpus __cpuinitdata;
@ -193,6 +202,7 @@ void __init setup_per_cpu_areas(void)
memcpy(ptr, __per_cpu_load, __per_cpu_end - __per_cpu_start);
per_cpu_offset(cpu) = ptr - __per_cpu_start;
per_cpu(this_cpu_off, cpu) = per_cpu_offset(cpu);
per_cpu(cpu_number, cpu) = cpu;
#ifdef CONFIG_X86_64
per_cpu(irq_stack_ptr, cpu) =
(char *)per_cpu(irq_stack, cpu) + IRQ_STACK_SIZE - 64;

2
arch/x86/kernel/smpcommon.c
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@ -28,7 +28,5 @@ __cpuinit void init_gdt(int cpu)
write_gdt_entry(get_cpu_gdt_table(cpu),
GDT_ENTRY_PERCPU, &gdt, DESCTYPE_S);
per_cpu(cpu_number, cpu) = cpu;
}
#endif