irqchip/gic-v5: Remove undue WARN_ON()s in the IRS affinity parsing

In gicv5_irs_of_init_affinity() a WARN_ON() is triggered if:

 1) a phandle in the "cpus" property does not correspond to a valid OF
    node
 2  a CPU logical id does not exist for a given OF cpu_node

l1k#1 is a firmware bug and should be reported as such but does not warrant a
   WARN_ON() backtrace.

l1k#2 is not necessarily an error condition (eg a kernel can be booted with
   nr_cpus=X limiting the number of cores artificially) and therefore there
   is no reason to clutter the kernel log with WARN_ON() output when the
   condition is hit.

Rework the IRS affinity parsing code to remove undue WARN_ON()s thus
making it less noisy.

Signed-off-by: Lorenzo Pieralisi <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lore.kernel.org/all/[email protected]

Author: Lorenzo Pieralisi

drivers/irqchip/irq-gic-v5-irs.c

@@ -626,12 +626,14 @@ static int __init gicv5_irs_of_init_affinity(struct device_node *node,
 		int cpu;
 
 		cpu_node = of_parse_phandle(node, "cpus", i);
-		if (WARN_ON(!cpu_node))
+		if (!cpu_node) {
+			pr_warn(FW_BUG "Erroneous CPU node phandle\n");
 			continue;
+		}
 
 		cpu = of_cpu_node_to_id(cpu_node);
 		of_node_put(cpu_node);
-		if (WARN_ON(cpu < 0))
+		if (cpu < 0)
 			continue;
 
 		if (iaffids[i] & ~iaffid_mask) {