[PATCH] x86-64: Extend clear_irq_vector (5df0287e) · Commits · 戴 / test

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@xmission.com> Cc: Muli Ben-Yehuda <muli@il.ibm.com> Signed-off-By:

Yinghai Lu <yinghai.lu@amd.com> Signed-off-by:

Andi Kleen <ak@suse.de>

arch/x86_64/kernel/io_apic.c

+17 −1

Original line number	Diff line number	Diff line
		@@ -750,6 +750,22 @@ static int assign_irq_vector(int irq, cpumask_t mask, cpumask_t *result)
		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 */
		@@ -1837,7 +1853,7 @@ 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);
		}

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