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Subject[PATCH 1/2] x86: get back 15 vectors


between FIRST_EXTERNAL_VECTOR (0x20) and FIRST_DEVICE_VECTOR (0x41)

for 0x20 and 0x2f, we are safe be used_vectors will prevent it to use used one.

also try to reuse 0x30 to 0x3f after smp_affinity for irq[0,15] is changed to other cpu.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
arch/x86/kernel/apic/io_apic.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

Index: linux-2.6/arch/x86/kernel/apic/io_apic.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/apic/io_apic.c
+++ linux-2.6/arch/x86/kernel/apic/io_apic.c
@@ -1162,7 +1162,8 @@ __assign_irq_vector(int irq, struct irq_
* Also, we've got to be careful not to trash gate
* 0x80, because int 0x80 is hm, kind of importantish. ;)
*/
- static int current_vector = FIRST_DEVICE_VECTOR, current_offset = 0;
+ static int current_vector = FIRST_EXTERNAL_VECTOR + 1;
+ static int current_offset = 0;
unsigned int old_vector;
int cpu, err;
cpumask_var_t tmp_mask;
@@ -1198,7 +1199,7 @@ next:
if (vector >= first_system_vector) {
/* If out of vectors on large boxen, must share them. */
offset = (offset + 1) % 8;
- vector = FIRST_DEVICE_VECTOR + offset;
+ vector = FIRST_EXTERNAL_VECTOR + 1 + offset;
}
if (unlikely(current_vector == vector))
continue;

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