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/include/linux/init.h b/include/linux/init.h
index 93538b6..cf9fa7f 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -246,6 +246,29 @@
/* Relies on boot_command_line being set */
void __init parse_early_param(void);
+
+struct dyn_array {
+ void **name;
+ unsigned long size;
+ unsigned int *nr;
+ unsigned long align;
+ void (*init_work)(void *);
+};
+extern struct dyn_array *__dyn_array_start[], *__dyn_array_end[];
+
+#define DEFINE_DYN_ARRAY(nameX, sizeX, nrX, alignX, init_workX) \
+ static struct dyn_array __dyn_array_##nameX __initdata = \
+ { .name = (void **)&nameX,\
+ .size = sizeX,\
+ .nr = &nrX,\
+ .align = alignX,\
+ .init_work = init_workX,\
+ }; \
+ static struct dyn_array *__dyn_array_ptr_##nameX __used \
+ __attribute__((__section__(".dyn_array.init"))) = \
+ &__dyn_array_##nameX
+
+extern void pre_alloc_dyn_array(void);
#endif /* __ASSEMBLY__ */
/**