forked from luck/tmp_suning_uos_patched
7f7ace0cda
Impact: reduce memory usage, use new cpumask API. Replace the affinity and pending_masks with cpumask_var_t's. This adds to the significant size reduction done with the SPARSE_IRQS changes. The added functions (init_alloc_desc_masks & init_copy_desc_masks) are in the include file so they can be inlined (and optimized out for the !CONFIG_CPUMASKS_OFFSTACK case.) [Naming chosen to be consistent with the other init*irq functions, as well as the backwards arg declaration of "from, to" instead of the more common "to, from" standard.] Includes a slight change to the declaration of struct irq_desc to embed the pending_mask within ifdef(CONFIG_SMP) to be consistent with other references, and some small changes to Xen. Tested: sparse/non-sparse/cpumask_offstack/non-cpumask_offstack/nonuma/nosmp on x86_64 Signed-off-by: Mike Travis <travis@sgi.com> Cc: Chris Wright <chrisw@sous-sol.org> Cc: Jeremy Fitzhardinge <jeremy@xensource.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Cc: virtualization@lists.osdl.org Cc: xen-devel@lists.xensource.com Cc: Yinghai Lu <yhlu.kernel@gmail.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
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#include <linux/irq.h>
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void move_masked_irq(int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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if (likely(!(desc->status & IRQ_MOVE_PENDING)))
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return;
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/*
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* Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
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*/
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if (CHECK_IRQ_PER_CPU(desc->status)) {
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WARN_ON(1);
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return;
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}
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desc->status &= ~IRQ_MOVE_PENDING;
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if (unlikely(cpumask_empty(desc->pending_mask)))
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return;
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if (!desc->chip->set_affinity)
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return;
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assert_spin_locked(&desc->lock);
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/*
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* If there was a valid mask to work with, please
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* do the disable, re-program, enable sequence.
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* This is *not* particularly important for level triggered
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* but in a edge trigger case, we might be setting rte
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* when an active trigger is comming in. This could
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* cause some ioapics to mal-function.
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* Being paranoid i guess!
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*
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* For correct operation this depends on the caller
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* masking the irqs.
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*/
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if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
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< nr_cpu_ids)) {
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cpumask_and(desc->affinity,
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desc->pending_mask, cpu_online_mask);
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desc->chip->set_affinity(irq, desc->affinity);
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}
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cpumask_clear(desc->pending_mask);
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}
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void move_native_irq(int irq)
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{
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struct irq_desc *desc = irq_to_desc(irq);
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if (likely(!(desc->status & IRQ_MOVE_PENDING)))
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return;
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if (unlikely(desc->status & IRQ_DISABLED))
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return;
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desc->chip->mask(irq);
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move_masked_irq(irq);
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desc->chip->unmask(irq);
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}
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