The patch titled
revert x86_64-mm-i386-pda-init
has been removed from the -mm tree. Its filename is
revert-x86_64-mm-i386-pda-init.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: revert x86_64-mm-i386-pda-init
From: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/i386/kernel/cpu/common.c | 183 +++++++-------------------------
arch/i386/kernel/smpboot.c | 27 +---
include/asm-i386/processor.h | 3
3 files changed, 51 insertions(+), 162 deletions(-)
diff -puN arch/i386/kernel/cpu/common.c~revert-x86_64-mm-i386-pda-init arch/i386/kernel/cpu/common.c
--- a/arch/i386/kernel/cpu/common.c~revert-x86_64-mm-i386-pda-init
+++ a/arch/i386/kernel/cpu/common.c
@@ -18,7 +18,6 @@
#include <asm/apic.h>
#include <mach_apic.h>
#endif
-#include <asm/pda.h>
#include "cpu.h"
@@ -28,9 +27,6 @@ EXPORT_PER_CPU_SYMBOL(cpu_gdt_descr);
DEFINE_PER_CPU(unsigned char, cpu_16bit_stack[CPU_16BIT_STACK_SIZE]);
EXPORT_PER_CPU_SYMBOL(cpu_16bit_stack);
-struct i386_pda *_cpu_pda[NR_CPUS] __read_mostly;
-EXPORT_SYMBOL(_cpu_pda);
-
static int cachesize_override __cpuinitdata = -1;
static int disable_x86_fxsr __cpuinitdata;
static int disable_x86_serial_nr __cpuinitdata = 1;
@@ -586,16 +582,42 @@ void __init early_cpu_init(void)
disable_pse = 1;
#endif
}
-
-__cpuinit int alloc_gdt(int cpu)
+/*
+ * cpu_init() initializes state that is per-CPU. Some data is already
+ * initialized (naturally) in the bootstrap process, such as the GDT
+ * and IDT. We reload them nevertheless, this function acts as a
+ * 'CPU state barrier', nothing should get across.
+ */
+void __cpuinit cpu_init(void)
{
- struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
+ int cpu = smp_processor_id();
+ struct tss_struct * t = &per_cpu(init_tss, cpu);
+ struct thread_struct *thread = ¤t->thread;
struct desc_struct *gdt;
- struct i386_pda *pda;
+ __u32 stk16_off = (__u32)&per_cpu(cpu_16bit_stack, cpu);
+ struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
+
+ if (cpu_test_and_set(cpu, cpu_initialized)) {
+ printk(KERN_WARNING "CPU#%d already initialized!\n", cpu);
+ for (;;) local_irq_enable();
+ }
+ printk(KERN_INFO "Initializing CPU#%d\n", cpu);
- gdt = (struct desc_struct *)cpu_gdt_descr->address;
- pda = cpu_pda(cpu);
+ if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
+ clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
+ if (tsc_disable && cpu_has_tsc) {
+ printk(KERN_NOTICE "Disabling TSC...\n");
+ /**** FIX-HPA: DOES THIS REALLY BELONG HERE? ****/
+ clear_bit(X86_FEATURE_TSC, boot_cpu_data.x86_capability);
+ set_in_cr4(X86_CR4_TSD);
+ }
+ /* The CPU hotplug case */
+ if (cpu_gdt_descr->address) {
+ gdt = (struct desc_struct *)cpu_gdt_descr->address;
+ memset(gdt, 0, PAGE_SIZE);
+ goto old_gdt;
+ }
/*
* This is a horrible hack to allocate the GDT. The problem
* is that cpu_init() is called really early for the boot CPU
@@ -603,70 +625,23 @@ __cpuinit int alloc_gdt(int cpu)
* CPUs, when bootmem will have gone away
*/
if (NODE_DATA(0)->bdata->node_bootmem_map) {
- BUG_ON(gdt != NULL || pda != NULL);
-
- gdt = alloc_bootmem_pages(PAGE_SIZE);
- pda = alloc_bootmem(sizeof(*pda));
- /* alloc_bootmem(_pages) panics on failure, so no check */
-
+ gdt = (struct desc_struct *)alloc_bootmem_pages(PAGE_SIZE);
+ /* alloc_bootmem_pages panics on failure, so no check */
memset(gdt, 0, PAGE_SIZE);
- memset(pda, 0, sizeof(*pda));
} else {
- /* GDT and PDA might already have been allocated if
- this is a CPU hotplug re-insertion. */
- if (gdt == NULL)
- gdt = (struct desc_struct *)get_zeroed_page(GFP_KERNEL);
-
- if (pda == NULL)
- pda = kmalloc_node(sizeof(*pda), GFP_KERNEL, cpu_to_node(cpu));
-
- if (unlikely(!gdt || !pda)) {
- free_pages((unsigned long)gdt, 0);
- kfree(pda);
- return 0;
+ gdt = (struct desc_struct *)get_zeroed_page(GFP_KERNEL);
+ if (unlikely(!gdt)) {
+ printk(KERN_CRIT "CPU%d failed to allocate GDT\n", cpu);
+ for (;;)
+ local_irq_enable();
}
}
-
- cpu_gdt_descr->address = (unsigned long)gdt;
- cpu_pda(cpu) = pda;
-
- return 1;
-}
-
-/* Initial PDA used by boot CPU */
-struct i386_pda boot_pda = {
- ._pda = &boot_pda,
- .cpu_number = 0,
- .pcurrent = &init_task,
-};
-
-/* Initialize the CPU's GDT and PDA. The boot CPU does this for
- itself, but secondaries find this done for them. */
-__cpuinit int init_gdt(int cpu, struct task_struct *idle)
-{
- struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
- __u32 stk16_off = (__u32)&per_cpu(cpu_16bit_stack, cpu);
- struct desc_struct *gdt;
- struct i386_pda *pda;
-
- /* For non-boot CPUs, the GDT and PDA should already have been
- allocated. */
- if (!alloc_gdt(cpu)) {
- printk(KERN_CRIT "CPU%d failed to allocate GDT or PDA\n", cpu);
- return 0;
- }
-
- gdt = (struct desc_struct *)cpu_gdt_descr->address;
- pda = cpu_pda(cpu);
-
- BUG_ON(gdt == NULL || pda == NULL);
-
+old_gdt:
/*
* Initialize the per-CPU GDT with the boot GDT,
* and set up the GDT descriptor:
*/
memcpy(gdt, cpu_gdt_table, GDT_SIZE);
- cpu_gdt_descr->size = GDT_SIZE - 1;
/* Set up GDT entry for 16bit stack */
*(__u64 *)(&gdt[GDT_ENTRY_ESPFIX_SS]) |=
@@ -674,57 +649,20 @@ __cpuinit int init_gdt(int cpu, struct t
((((__u64)stk16_off) << 32) & 0xff00000000000000ULL) |
(CPU_16BIT_STACK_SIZE - 1);
- pack_descriptor((u32 *)&gdt[GDT_ENTRY_PDA].a,
- (u32 *)&gdt[GDT_ENTRY_PDA].b,
- (unsigned long)pda, sizeof(*pda) - 1,
- 0x80 | DESCTYPE_S | 0x2, 0); /* present read-write data segment */
-
- memset(pda, 0, sizeof(*pda));
- pda->_pda = pda;
- pda->cpu_number = cpu;
- pda->pcurrent = idle;
-
- return 1;
-}
-
-/* Common CPU init for both boot and secondary CPUs */
-static void __cpuinit _cpu_init(int cpu, struct task_struct *curr)
-{
- struct tss_struct * t = &per_cpu(init_tss, cpu);
- struct thread_struct *thread = &curr->thread;
- struct Xgt_desc_struct *cpu_gdt_descr = &per_cpu(cpu_gdt_descr, cpu);
+ cpu_gdt_descr->size = GDT_SIZE - 1;
+ cpu_gdt_descr->address = (unsigned long)gdt;
- /* Reinit these anyway, even if they've already been done (on
- the boot CPU, this will transition from the boot gdt+pda to
- the real ones). */
load_gdt(cpu_gdt_descr);
-
- if (cpu_test_and_set(cpu, cpu_initialized)) {
- printk(KERN_WARNING "CPU#%d already initialized!\n", cpu);
- for (;;) local_irq_enable();
- }
-
- printk(KERN_INFO "Initializing CPU#%d\n", cpu);
-
- if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
- clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
- if (tsc_disable && cpu_has_tsc) {
- printk(KERN_NOTICE "Disabling TSC...\n");
- /**** FIX-HPA: DOES THIS REALLY BELONG HERE? ****/
- clear_bit(X86_FEATURE_TSC, boot_cpu_data.x86_capability);
- set_in_cr4(X86_CR4_TSD);
- }
-
load_idt(&idt_descr);
/*
* Set up and load the per-CPU TSS and LDT
*/
atomic_inc(&init_mm.mm_count);
- curr->active_mm = &init_mm;
- if (curr->mm)
+ current->active_mm = &init_mm;
+ if (current->mm)
BUG();
- enter_lazy_tlb(&init_mm, curr);
+ enter_lazy_tlb(&init_mm, current);
load_esp0(t, thread);
set_tss_desc(cpu,t);
@@ -755,37 +693,6 @@ static void __cpuinit _cpu_init(int cpu,
mxcsr_feature_mask_init();
}
-/* Entrypoint to initialize secondary CPU */
-void __cpuinit secondary_cpu_init(void)
-{
- int cpu = smp_processor_id();
- struct task_struct *curr = current;
-
- _cpu_init(cpu, curr);
-}
-
-/*
- * cpu_init() initializes state that is per-CPU. Some data is already
- * initialized (naturally) in the bootstrap process, such as the GDT
- * and IDT. We reload them nevertheless, this function acts as a
- * 'CPU state barrier', nothing should get across.
- */
-void __cpuinit cpu_init(void)
-{
- int cpu = smp_processor_id();
- struct task_struct *curr = current;
-
- /* Set up the real GDT and PDA, so we can transition from the
- boot versions. */
- if (!init_gdt(cpu, curr)) {
- /* failed to allocate something; not much we can do... */
- for (;;)
- local_irq_enable();
- }
-
- _cpu_init(cpu, curr);
-}
-
#ifdef CONFIG_HOTPLUG_CPU
void __cpuinit cpu_uninit(void)
{
diff -puN arch/i386/kernel/smpboot.c~revert-x86_64-mm-i386-pda-init arch/i386/kernel/smpboot.c
--- a/arch/i386/kernel/smpboot.c~revert-x86_64-mm-i386-pda-init
+++ a/arch/i386/kernel/smpboot.c
@@ -536,11 +536,11 @@ set_cpu_sibling_map(int cpu)
static void __devinit start_secondary(void *unused)
{
/*
- * Don't put *anything* before secondary_cpu_init(), SMP
+ * Dont put anything before smp_callin(), SMP
* booting is too fragile that we want to limit the
* things done here to the most necessary things.
*/
- secondary_cpu_init();
+ cpu_init();
preempt_disable();
smp_callin();
while (!cpu_isset(smp_processor_id(), smp_commenced_mask))
@@ -599,16 +599,13 @@ void __devinit initialize_secondary(void
"movl %0,%%esp\n\t"
"jmp *%1"
:
- :"m" (current->thread.esp),"m" (current->thread.eip));
+ :"r" (current->thread.esp),"r" (current->thread.eip));
}
-/* Static state in head.S used to set up a CPU */
extern struct {
void * esp;
unsigned short ss;
} stack_start;
-extern struct i386_pda *start_pda;
-extern struct Xgt_desc_struct cpu_gdt_descr;
#ifdef CONFIG_NUMA
@@ -938,6 +935,9 @@ static int __devinit do_boot_cpu(int api
unsigned long start_eip;
unsigned short nmi_high = 0, nmi_low = 0;
+ ++cpucount;
+ alternatives_smp_switch(1);
+
/*
* We can't use kernel_thread since we must avoid to
* reschedule the child.
@@ -945,30 +945,15 @@ static int __devinit do_boot_cpu(int api
idle = alloc_idle_task(cpu);
if (IS_ERR(idle))
panic("failed fork for CPU %d", cpu);
-
- /* Pre-allocate and initialize the CPU's GDT and PDA so it
- doesn't have to do any memory allocation during the
- delicate CPU-bringup phase. */
- if (!init_gdt(cpu, idle)) {
- printk(KERN_INFO "Couldn't allocate GDT/PDA for CPU %d\n", cpu);
- return -1; /* ? */
- }
-
idle->thread.eip = (unsigned long) start_secondary;
/* start_eip had better be page-aligned! */
start_eip = setup_trampoline();
- ++cpucount;
- alternatives_smp_switch(1);
-
/* So we see what's up */
printk("Booting processor %d/%d eip %lx\n", cpu, apicid, start_eip);
/* Stack for startup_32 can be just as for start_secondary onwards */
stack_start.esp = (void *) idle->thread.esp;
- start_pda = cpu_pda(cpu);
- cpu_gdt_descr = per_cpu(cpu_gdt_descr, cpu);
-
irq_ctx_init(cpu);
x86_cpu_to_apicid[cpu] = apicid;
diff -puN include/asm-i386/processor.h~revert-x86_64-mm-i386-pda-init include/asm-i386/processor.h
--- a/include/asm-i386/processor.h~revert-x86_64-mm-i386-pda-init
+++ a/include/asm-i386/processor.h
@@ -727,7 +727,4 @@ extern unsigned long boot_option_idle_ov
extern void enable_sep_cpu(void);
extern int sysenter_setup(void);
-extern int init_gdt(int cpu, struct task_struct *idle);
-extern void secondary_cpu_init(void);
-
#endif /* __ASM_I386_PROCESSOR_H */
_
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