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cpumask: update irq_desc to use cpumask_var_t

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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>
This commit is contained in:
Mike Travis
2009-01-10 21:58:08 -08:00
committed by Ingo Molnar
parent c59765042f
commit 7f7ace0cda
11 changed files with 135 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
kernel/irq/migration.c
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@@ -18,7 +18,7 @@ void move_masked_irq(int irq)
desc->status &= ~IRQ_MOVE_PENDING;
if (unlikely(cpumask_empty(&desc->pending_mask)))
if (unlikely(cpumask_empty(desc->pending_mask)))
return;
if (!desc->chip->set_affinity)
@@ -38,13 +38,13 @@ void move_masked_irq(int irq)
* For correct operation this depends on the caller
* masking the irqs.
*/
if (likely(cpumask_any_and(&desc->pending_mask, cpu_online_mask)
if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
< nr_cpu_ids)) {
cpumask_and(&desc->affinity,
&desc->pending_mask, cpu_online_mask);
desc->chip->set_affinity(irq, &desc->affinity);
cpumask_and(desc->affinity,
desc->pending_mask, cpu_online_mask);
desc->chip->set_affinity(irq, desc->affinity);
}
cpumask_clear(&desc->pending_mask);
cpumask_clear(desc->pending_mask);
}
void move_native_irq(int irq)