The patch titled
x86_64 irq: reset more to default when clear irq_vector for destroy_irq
has been added to the -mm tree. Its filename is
x86_64-irq-reset-more-to-default-when-clear-irq_vector-for-destroy_irq.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: x86_64 irq: reset more to default when clear irq_vector for destroy_irq
From: "Yinghai Lu" <yinghai.lu@xxxxxxx>
Clear the irq releated entries in irq_vector, irq_domain and vector_irq
instead of clearing irq_vector only. So when new irq is created, it could
reuse that vector. (actually is the second loop scanning from
FIRST_DEVICE_VECTOR+8). This could avoid the vectors are used up with
enough module inserting and removing
Cc: Eric W. Biedierman <ebiederm@xxxxxxxxxxxx>
Cc: Muli Ben-Yehuda <muli@xxxxxxxxxx>
Signed-off-by: Yinghai Lu <yinghai.lu@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/x86_64/kernel/io_apic.c | 18 +++++++++++++++++-
1 file changed, 17 insertions(+), 1 deletion(-)
diff -puN arch/x86_64/kernel/io_apic.c~x86_64-irq-reset-more-to-default-when-clear-irq_vector-for-destroy_irq arch/x86_64/kernel/io_apic.c
--- a/arch/x86_64/kernel/io_apic.c~x86_64-irq-reset-more-to-default-when-clear-irq_vector-for-destroy_irq
+++ a/arch/x86_64/kernel/io_apic.c
@@ -714,6 +714,22 @@ static int assign_irq_vector(int irq, cp
return vector;
}
+static void __clear_irq_vector(int irq)
+{
+ cpumask_t mask;
+ int cpu, vector;
+
+ BUG_ON(!irq_vector[irq]);
+
+ vector = irq_vector[irq];
+ cpus_and(mask, irq_domain[irq], cpu_online_map);
+ for_each_cpu_mask(cpu, mask)
+ per_cpu(vector_irq, cpu)[vector] = -1;
+
+ irq_vector[irq] = 0;
+ irq_domain[irq] = CPU_MASK_NONE;
+}
+
void __setup_vector_irq(int cpu)
{
/* Initialize vector_irq on a new cpu */
@@ -1801,7 +1817,7 @@ void destroy_irq(unsigned int irq)
dynamic_irq_cleanup(irq);
spin_lock_irqsave(&vector_lock, flags);
- irq_vector[irq] = 0;
+ __clear_irq_vector(irq);
spin_unlock_irqrestore(&vector_lock, flags);
}
_
Patches currently in -mm which might be from yinghai.lu@xxxxxxx are
x86_64-irq-reuse-vector-for-__assign_irq_vector.patch
x86_64-irq-reset-more-to-default-when-clear-irq_vector-for-destroy_irq.patch
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