None of the cell platforms support CPU hotplug, so we should iterate
only over online nodes when setting PMU interrupts.

This also fixes a warning during boot when NODES_SHIFT is large enough:

WARNING: at /scratch/michael/src/kmk/linus/kernel/irq/irqdomain.c:766
...
NIP [c0000000000db278] .irq_linear_revmap+0x30/0x58
LR [c0000000000dc2a0] .irq_create_mapping+0x38/0x1a8
Call Trace:
[c0000003fc9c3af0] [c0000000000dc2a0] .irq_create_mapping+0x38/0x1a8
(unreliable) [c0000003fc9c3b80] [c000000000655c1c]
.__machine_initcall_cell_cbe_init_pm_irq+0x84/0x158 [c0000003fc9c3c20]
[c00000000000afb4] .do_one_initcall+0x5c/0x1e0
[c0000003fc9c3cd0] [c000000000644580] .kernel_init_freeable+0x238/0x328
[c0000003fc9c3db0] [c00000000000b784] .kernel_init+0x1c/0x120
[c0000003fc9c3e30] [c000000000009fb8] .ret_from_kernel_thread+0x64/0xac

This is caused by us overflowing our linear revmap because we're
requesting too many interrupts.

Reported-by: Dennis Schridde <redacted>
Signed-off-by: Michael Ellerman <redacted>
---
 arch/powerpc/platforms/cell/pmu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/cell/pmu.c

b/arch/powerpc/platforms/cell/pmu.c index 59c1a16..348a27b 100644

--- a/arch/powerpc/platforms/cell/pmu.c
+++ b/arch/powerpc/platforms/cell/pmu.c

@@ -382,7 +382,7 @@ static int __init cbe_init_pm_irq(void)
 	unsigned int irq;
 	int rc, node;

-	for_each_node(node) {
+	for_each_online_node(node) {
 		irq = irq_create_mapping(NULL, IIC_IRQ_IOEX_PMI |
 					       (node << IIC_IRQ_NODE_SHIFT));
 		if (irq == NO_IRQ) {