generic: add dyn_array support
Allow crazy big arrays via bootmem at init stage.
Architectures use CONFIG_HAVE_DYN_ARRAY to enable it.
usage:
| static struct irq_desc irq_desc_init __initdata = {
| .status = IRQ_DISABLED,
| .chip = &no_irq_chip,
| .handle_irq = handle_bad_irq,
| .depth = 1,
| .lock = __SPIN_LOCK_UNLOCKED(irq_desc->lock),
| #ifdef CONFIG_SMP
| .affinity = CPU_MASK_ALL
| #endif
| };
|
| static void __init init_work(void *data)
| {
| struct dyn_array *da = data;
| struct irq_desc *desc;
| int i;
|
| desc = *da->name;
|
| for (i = 0; i < *da->nr; i++)
| memcpy(&desc[i], &irq_desc_init, sizeof(struct irq_desc));
| }
|
| struct irq_desc *irq_desc;
| DEFINE_DYN_ARRAY(irq_desc, sizeof(struct irq_desc), nr_irqs, PAGE_SIZE, init_work);
after pre_alloc_dyn_array() after setup_arch(), the array is ready to be
used.
Via this facility we can replace irq_desc[NR_IRQS] array with dyn_array
irq_desc[nr_irqs].
v2: remove _nopanic in pre_alloc_dyn_array()
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/init/main.c b/init/main.c
index 27f6bf6..638d3a7 100644
--- a/init/main.c
+++ b/init/main.c
@@ -536,6 +536,29 @@
{
}
+void pre_alloc_dyn_array(void)
+{
+#ifdef CONFIG_HAVE_DYN_ARRAY
+ unsigned long size, phys = 0;
+ struct dyn_array **daa;
+
+ for (daa = __dyn_array_start ; daa < __dyn_array_end; daa++) {
+ struct dyn_array *da = *daa;
+
+ size = da->size * (*da->nr);
+ print_fn_descriptor_symbol("dyna_array %s ", da->name);
+ printk(KERN_CONT "size:%#lx nr:%d align:%#lx",
+ da->size, *da->nr, da->align);
+ *da->name = __alloc_bootmem(size, da->align, phys);
+ phys = virt_to_phys(*da->name);
+ printk(KERN_CONT " ==> [%#lx - %#lx]\n", phys, phys + size);
+
+ if (da->init_work)
+ da->init_work(da);
+ }
+#endif
+}
+
asmlinkage void __init start_kernel(void)
{
char * command_line;
@@ -567,6 +590,7 @@
printk(KERN_NOTICE);
printk(linux_banner);
setup_arch(&command_line);
+ pre_alloc_dyn_array();
mm_init_owner(&init_mm, &init_task);
setup_command_line(command_line);
unwind_setup();