set nr_irqs according to nr_cpu_ids, so could get small footprint when use
big kernel.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
---
arch/Kconfig | 2 ++
arch/x86/Kconfig | 1 +
arch/x86/kernel/io_apic_64.c | 28 +++++++++++++++++++++-------
arch/x86/kernel/setup.c | 6 ++++++
arch/x86/kernel/vmlinux_64.lds.S | 3 +++
5 files changed, 33 insertions(+), 7 deletions(-)
Index: linux-2.6/arch/Kconfig
===================================================================
--- linux-2.6.orig/arch/Kconfig
+++ linux-2.6/arch/Kconfig
@@ -103,3 +103,5 @@ config HAVE_CLK
The <linux/clk.h> calls support software clock gating and
thus are a key power management tool on many systems.
+config HAVE_DYN_ARRAY
+ def_bool n
Index: linux-2.6/arch/x86/Kconfig
===================================================================
--- linux-2.6.orig/arch/x86/Kconfig
+++ linux-2.6/arch/x86/Kconfig
@@ -33,6 +33,7 @@ config X86
select HAVE_ARCH_TRACEHOOK
select HAVE_GENERIC_DMA_COHERENT if X86_32
select HAVE_EFFICIENT_UNALIGNED_ACCESS
+ select HAVE_DYN_ARRAY if X86_64
config ARCH_DEFCONFIG
string
Index: linux-2.6/arch/x86/kernel/io_apic_64.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/io_apic_64.c
+++ linux-2.6/arch/x86/kernel/io_apic_64.c
@@ -66,7 +66,7 @@ struct irq_cfg {
};
/* irq_cfg is indexed by the sum of all RTEs in all I/O APICs. */
-static struct irq_cfg irq_cfg[NR_IRQS] __read_mostly = {
+static struct irq_cfg irq_cfg_legacy[] __initdata = {
[0] = { .domain = CPU_MASK_ALL, .vector = IRQ0_VECTOR, },
[1] = { .domain = CPU_MASK_ALL, .vector = IRQ1_VECTOR, },
[2] = { .domain = CPU_MASK_ALL, .vector = IRQ2_VECTOR, },
@@ -85,6 +85,17 @@ static struct irq_cfg irq_cfg[NR_IRQS] _
[15] = { .domain = CPU_MASK_ALL, .vector = IRQ15_VECTOR, },
};
+static struct irq_cfg *irq_cfg;
+
+static void __init init_work(void *data)
+{
+ struct dyn_array *da = data;
+
+ memcpy(*da->name, irq_cfg_legacy, sizeof(irq_cfg_legacy));
+}
+
+DEFINE_DYN_ARRAY(irq_cfg, sizeof(struct irq_cfg), nr_irqs, PAGE_SIZE, init_work);
+
static int assign_irq_vector(int irq, cpumask_t mask);
int first_system_vector = 0xfe;
@@ -129,10 +140,9 @@ DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BU
* Rough estimation of how many shared IRQs there are, can
* be changed anytime.
*/
-#define MAX_PLUS_SHARED_IRQS NR_IRQS
-#define PIN_MAP_SIZE (MAX_PLUS_SHARED_IRQS + NR_IRQS)
-int pin_map_size = PIN_MAP_SIZE;
+int pin_map_size;
+
/*
* This is performance-critical, we want to do it O(1)
*
@@ -141,8 +151,12 @@ int pin_map_size = PIN_MAP_SIZE;
*/
static struct irq_pin_list {
- short apic, pin, next;
-} irq_2_pin[PIN_MAP_SIZE];
+ short apic, pin;
+ int next;
+} *irq_2_pin;
+
+DEFINE_DYN_ARRAY(irq_2_pin, sizeof(struct irq_pin_list), pin_map_size, sizeof(struct irq_pin_list), NULL);
+
struct io_apic {
unsigned int index;
@@ -359,7 +373,7 @@ static void set_ioapic_affinity_irq(unsi
* shared ISA-space IRQs, so we have to support them. We are super
* fast in the common case, and fast for shared ISA-space IRQs.
*/
-int first_free_entry = NR_IRQS;
+int first_free_entry;
static void add_pin_to_irq(unsigned int irq, int apic, int pin)
{
struct irq_pin_list *entry = irq_2_pin + irq;
Index: linux-2.6/arch/x86/kernel/setup.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup.c
+++ linux-2.6/arch/x86/kernel/setup.c
@@ -856,7 +856,13 @@ void __init setup_arch(char **cmdline_p)
#endif
prefill_possible_map();
+
#ifdef CONFIG_X86_64
+ /* need to wait for nr_cpu_ids settle down */
+ if (nr_irqs == NR_IRQS)
+ nr_irqs = 32 * nr_cpu_ids + 224;
+ pin_map_size = nr_irqs * 2;
+ first_free_entry = nr_irqs;
init_cpu_to_node();
#endif
Index: linux-2.6/arch/x86/kernel/vmlinux_64.lds.S
===================================================================
--- linux-2.6.orig/arch/x86/kernel/vmlinux_64.lds.S
+++ linux-2.6/arch/x86/kernel/vmlinux_64.lds.S
@@ -174,6 +174,9 @@ SECTIONS
*(.x86cpuvendor.init)
}
__x86cpuvendor_end = .;
+
+ DYN_ARRAY_INIT(8)
+
SECURITY_INIT
. = ALIGN(8);
--
