Messages in this thread Patch in this message | | | Date | Sun, 03 Jan 2010 22:59:25 -0800 | From | Yinghai Lu <> | Subject | [PATCH 1/2] x86: get back 15 vectors |
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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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