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powerpc/irqdomain: Fix broken NR_IRQ references

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The switch from using irq_map to irq_alloc_desc*() for managing irq
number allocations introduced new bugs in some of the powerpc
interrupt code.  Several functions rely on the value of NR_IRQS to
determine the maximum irq number that could get allocated.  However,
with sparse_irq and using irq_alloc_desc*() the maximum possible irq
number is now specified with 'nr_irqs' which may be a number larger
than NR_IRQS.  This has caused breakage on powermac when
CONFIG_NR_IRQS is set to 32.

This patch removes most of the direct references to NR_IRQS in the
powerpc code and replaces them with either a nr_irqs reference or by
using the common for_each_irq_desc() macro.  The powerpc-specific
for_each_irq() macro is removed at the same time.

Also, the Cell axon_msi driver is refactored to remove the global
build assumption on the size of NR_IRQS and instead add a limit to the
maximum irq number when calling irq_domain_add_nomap().

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Grant Likely
2012-04-23 12:30:02 +00:00
committed by Benjamin Herrenschmidt
parent 8751ed14dc
commit 4013369f37
8 changed files with 14 additions and 29 deletions
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6
arch/powerpc/kernel/irq.c
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@@ -330,14 +330,10 @@ void migrate_irqs(void)
alloc_cpumask_var(&mask, GFP_KERNEL);
for_each_irq(irq) {
for_each_irq_desc(irq, desc) {
struct irq_data *data;
struct irq_chip *chip;
desc = irq_to_desc(irq);
if (!desc)
continue;
data = irq_desc_get_irq_data(desc);
if (irqd_is_per_cpu(data))
continue;