lkml.org 
[lkml]   [2008]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 3/7] add dyn_array support
Date
[
so could put some crazy big array in bootmem in init stage.

use CONFIG_HAVE_DYN_ARRAY to enable it or not

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

---
include/asm-generic/vmlinux.lds.h | 7 +++++++
include/linux/init.h | 23 +++++++++++++++++++++++
init/main.c | 25 +++++++++++++++++++++++++
3 files changed, 55 insertions(+)
Index: linux-2.6/include/asm-generic/vmlinux.lds.h
===================================================================
--- linux-2.6.orig/include/asm-generic/vmlinux.lds.h
+++ linux-2.6/include/asm-generic/vmlinux.lds.h
@@ -214,6 +214,13 @@
* All archs are supposed to use RO_DATA() */
#define RODATA RO_DATA(4096)

+#define DYN_ARRAY_INIT(align) \
+ . = ALIGN((align)); \
+ .dyn_array.init : AT(ADDR(.dyn_array.init) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__dyn_array_start) = .; \
+ *(.dyn_array.init) \
+ VMLINUX_SYMBOL(__dyn_array_end) = .; \
+ }
#define SECURITY_INIT \
.security_initcall.init : AT(ADDR(.security_initcall.init) - LOAD_OFFSET) { \
VMLINUX_SYMBOL(__security_initcall_start) = .; \
Index: linux-2.6/include/linux/init.h
===================================================================
--- linux-2.6.orig/include/linux/init.h
+++ linux-2.6/include/linux/init.h
@@ -249,6 +249,29 @@ struct obs_kernel_param {

/* 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__ */

/**
Index: linux-2.6/init/main.c
===================================================================
--- linux-2.6.orig/init/main.c
+++ linux-2.6/init/main.c
@@ -539,6 +539,29 @@ void __init __weak thread_info_cache_ini
{
}

+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_nopanic(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;
@@ -576,6 +599,8 @@ asmlinkage void __init start_kernel(void
printk(KERN_NOTICE);
printk(linux_banner);
setup_arch(&command_line);
+ printk(KERN_INFO "nr_irqs: %d\n", nr_irqs);
+ pre_alloc_dyn_array();
mm_init_owner(&init_mm, &init_task);
setup_command_line(command_line);
unwind_setup();

\
 
 \ /
  Last update: 2008-07-30 23:13    [W:0.235 / U:0.104 seconds]
©2003-2014 Jasper Spaans. Advertise on this site