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authorYinghai Lu <yhlu.kernel@gmail.com>2008-08-19 20:49:43 -0700
committerIngo Molnar <mingo@elte.hu>2008-10-16 16:52:02 +0200
commit3ddfda11861d305b02ed810b522dcf48b74ca808 (patch)
tree869836872865f07fb56b5fa9649241143ae87b79 /init
parent38395738f581ce9417402f28774a8c4650264a00 (diff)
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>
Diffstat (limited to 'init')
-rw-r--r--init/main.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index 27f6bf6108e9..638d3a786412 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();