x86: use specialized routine for setup per-cpu area
We use the same routing as x86_64, moved now to setup.c.
Just with a few ifdefs inside.
Note that this routing uses prefill_possible_map().
It has the very nice side effect of allowing hotplugging of
cpus that are marked as present but disabled by acpi bios.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index c436e74..5d33509 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -18,7 +18,7 @@
obj-y := process_$(BITS).o signal_$(BITS).o entry_$(BITS).o
obj-y += traps_$(BITS).o irq_$(BITS).o
obj-y += time_$(BITS).o ioport.o ldt.o
-obj-y += setup_$(BITS).o i8259_$(BITS).o
+obj-y += setup_$(BITS).o i8259_$(BITS).o setup.o
obj-$(CONFIG_X86_32) += sys_i386_32.o i386_ksyms_32.o
obj-$(CONFIG_X86_64) += sys_x86_64.o x8664_ksyms_64.o
obj-$(CONFIG_X86_64) += syscall_64.o vsyscall_64.o setup64.o
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
new file mode 100644
index 0000000..1179aa0
--- /dev/null
+++ b/arch/x86/kernel/setup.c
@@ -0,0 +1,103 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/percpu.h>
+#include <asm/smp.h>
+#include <asm/percpu.h>
+#include <asm/sections.h>
+#include <asm/processor.h>
+#include <asm/setup.h>
+#include <asm/topology.h>
+
+#ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
+/*
+ * Copy data used in early init routines from the initial arrays to the
+ * per cpu data areas. These arrays then become expendable and the
+ * *_early_ptr's are zeroed indicating that the static arrays are gone.
+ */
+static void __init setup_per_cpu_maps(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+#ifdef CONFIG_SMP
+ if (per_cpu_offset(cpu)) {
+#endif
+ per_cpu(x86_cpu_to_apicid, cpu) =
+ x86_cpu_to_apicid_init[cpu];
+ per_cpu(x86_bios_cpu_apicid, cpu) =
+ x86_bios_cpu_apicid_init[cpu];
+#ifdef CONFIG_NUMA
+ per_cpu(x86_cpu_to_node_map, cpu) =
+ x86_cpu_to_node_map_init[cpu];
+#endif
+#ifdef CONFIG_SMP
+ } else
+ printk(KERN_NOTICE "per_cpu_offset zero for cpu %d\n",
+ cpu);
+#endif
+ }
+
+ /* indicate the early static arrays will soon be gone */
+ x86_cpu_to_apicid_early_ptr = NULL;
+ x86_bios_cpu_apicid_early_ptr = NULL;
+#ifdef CONFIG_NUMA
+ x86_cpu_to_node_map_early_ptr = NULL;
+#endif
+}
+
+#ifdef CONFIG_X86_32
+/*
+ * Great future not-so-futuristic plan: make i386 and x86_64 do it
+ * the same way
+ */
+unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
+EXPORT_SYMBOL(__per_cpu_offset);
+#endif
+
+/*
+ * Great future plan:
+ * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
+ * Always point %gs to its beginning
+ */
+void __init setup_per_cpu_areas(void)
+{
+ int i;
+ unsigned long size;
+
+#ifdef CONFIG_HOTPLUG_CPU
+ prefill_possible_map();
+#endif
+
+ /* Copy section for each CPU (we discard the original) */
+ size = PERCPU_ENOUGH_ROOM;
+
+ printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n",
+ size);
+ for_each_cpu_mask(i, cpu_possible_map) {
+ char *ptr;
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+ ptr = alloc_bootmem_pages(size);
+#else
+ int node = early_cpu_to_node(i);
+ if (!node_online(node) || !NODE_DATA(node))
+ ptr = alloc_bootmem_pages(size);
+ else
+ ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
+#endif
+ if (!ptr)
+ panic("Cannot allocate cpu data for CPU %d\n", i);
+#ifdef CONFIG_X86_64
+ cpu_pda(i)->data_offset = ptr - __per_cpu_start;
+#else
+ __per_cpu_offset[i] = ptr - __per_cpu_start;
+#endif
+ memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
+ }
+
+ /* setup percpu data maps early */
+ setup_per_cpu_maps();
+}
+
+#endif
diff --git a/arch/x86/kernel/setup64.c b/arch/x86/kernel/setup64.c
index e24c456..6b4e326 100644
--- a/arch/x86/kernel/setup64.c
+++ b/arch/x86/kernel/setup64.c
@@ -85,83 +85,6 @@
}
__setup("noexec32=", nonx32_setup);
-/*
- * Copy data used in early init routines from the initial arrays to the
- * per cpu data areas. These arrays then become expendable and the
- * *_early_ptr's are zeroed indicating that the static arrays are gone.
- */
-static void __init setup_per_cpu_maps(void)
-{
- int cpu;
-
- for_each_possible_cpu(cpu) {
-#ifdef CONFIG_SMP
- if (per_cpu_offset(cpu)) {
-#endif
- per_cpu(x86_cpu_to_apicid, cpu) =
- x86_cpu_to_apicid_init[cpu];
- per_cpu(x86_bios_cpu_apicid, cpu) =
- x86_bios_cpu_apicid_init[cpu];
-#ifdef CONFIG_NUMA
- per_cpu(x86_cpu_to_node_map, cpu) =
- x86_cpu_to_node_map_init[cpu];
-#endif
-#ifdef CONFIG_SMP
- }
- else
- printk(KERN_NOTICE "per_cpu_offset zero for cpu %d\n",
- cpu);
-#endif
- }
-
- /* indicate the early static arrays will soon be gone */
- x86_cpu_to_apicid_early_ptr = NULL;
- x86_bios_cpu_apicid_early_ptr = NULL;
-#ifdef CONFIG_NUMA
- x86_cpu_to_node_map_early_ptr = NULL;
-#endif
-}
-
-/*
- * Great future plan:
- * Declare PDA itself and support (irqstack,tss,pgd) as per cpu data.
- * Always point %gs to its beginning
- */
-void __init setup_per_cpu_areas(void)
-{
- int i;
- unsigned long size;
-
-#ifdef CONFIG_HOTPLUG_CPU
- prefill_possible_map();
-#endif
-
- /* Copy section for each CPU (we discard the original) */
- size = PERCPU_ENOUGH_ROOM;
-
- printk(KERN_INFO "PERCPU: Allocating %lu bytes of per cpu data\n", size);
- for_each_cpu_mask (i, cpu_possible_map) {
- char *ptr;
-#ifndef CONFIG_NEED_MULTIPLE_NODES
- ptr = alloc_bootmem_pages(size);
-#else
- int node = early_cpu_to_node(i);
-
- if (!node_online(node) || !NODE_DATA(node))
- ptr = alloc_bootmem_pages(size);
- else
- ptr = alloc_bootmem_pages_node(NODE_DATA(node), size);
-#endif
- if (!ptr)
- panic("Cannot allocate cpu data for CPU %d\n", i);
- cpu_pda(i)->data_offset = ptr - __per_cpu_start;
- memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
- }
-
- /* setup percpu data maps early */
- setup_per_cpu_maps();
-}
-
void pda_init(int cpu)
{
struct x8664_pda *pda = cpu_pda(cpu);
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 92a5df6..bf5c9e9 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -665,6 +665,7 @@
unmap_cpu_to_logical_apicid(cpu);
cpu_clear(cpu, cpu_callout_map); /* was set here (do_boot_cpu()) */
cpu_clear(cpu, cpu_initialized); /* was set by cpu_init() */
+ cpu_clear(cpu, cpu_possible_map);
cpucount--;
} else {
per_cpu(x86_cpu_to_apicid, cpu) = apicid;
@@ -743,6 +744,7 @@
static void __init disable_smp(void)
{
+ cpu_possible_map = cpumask_of_cpu(0);
smpboot_clear_io_apic_irqs();
phys_cpu_present_map = physid_mask_of_physid(0);
map_cpu_to_logical_apicid();