From 3ddfda11861d305b02ed810b522dcf48b74ca808 Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Tue, 19 Aug 2008 20:49:43 -0700 Subject: 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 Signed-off-by: Ingo Molnar --- init/main.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'init') diff --git a/init/main.c b/init/main.c index 27f6bf6108e..638d3a78641 100644 --- a/init/main.c +++ b/init/main.c @@ -536,6 +536,29 @@ void __init __weak thread_info_cache_init(void) { } +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 @@ asmlinkage void __init start_kernel(void) 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(); -- cgit v1.2.3