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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 <[email protected]>
Cc: Chris Wright <[email protected]>
Cc: Jeremy Fitzhardinge <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Venkatesh Pallipadi <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Yinghai Lu <[email protected]>
This commit is contained in:
Mike Travis 2009-01-10 21:58:08 -08:00 • committed by Ingo Molnar
commit 7f7ace0cda
11 changed files with 135 additions and 45 deletions
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4
drivers/xen/events.c
View file

@ -125,7 +125,7 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
BUG_ON(irq == -1);
#ifdef CONFIG_SMP
irq_to_desc(irq)->affinity = cpumask_of_cpu(cpu);
cpumask_copy(irq_to_desc(irq)->affinity, cpumask_of(cpu));
#endif
__clear_bit(chn, cpu_evtchn_mask[cpu_evtchn[chn]]);
@ -142,7 +142,7 @@ static void init_evtchn_cpu_bindings(void)
/* By default all event channels notify CPU#0. */
for_each_irq_desc(i, desc) {
desc->affinity = cpumask_of_cpu(0);
cpumask_copy(desc->affinity, cpumask_of(0));
}
#endif