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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 /include
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 'include')
-rw-r--r--include/asm-generic/vmlinux.lds.h7
-rw-r--r--include/linux/init.h23
2 files changed, 30 insertions, 0 deletions
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 7440a0dcedd..7881406c03e 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -210,6 +210,13 @@
* 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) = .; \
diff --git a/include/linux/init.h b/include/linux/init.h
index 93538b696e3..cf9fa7f174a 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -246,6 +246,29 @@ 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__ */
/**