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

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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

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

#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 <lpieralisi@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250814094138.1611017-1-lpieralisi@kernel.org
This commit is contained in:
Lorenzo Pieralisi 2025-08-14 11:41:38 +02:00 committed by Thomas Gleixner
parent 1a2cce5b91
commit 35c23871be
1 changed files with 4 additions and 2 deletions
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6
drivers/irqchip/irq-gic-v5-irs.c
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@ -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) {