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xen/6666ba52-x86-irq-remove-offline-CPUs-from-old-CPU-mask-when.patch

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References: bsc#1214718
# Commit e63209d3ba2fd1b2f232babd14c9c679ffa7b09a
# Date 2024-06-10 10:33:22 +0200
# Author Roger Pau Monné <roger.pau@citrix.com>
# Committer Jan Beulich <jbeulich@suse.com>
x86/irq: remove offline CPUs from old CPU mask when adjusting move_cleanup_count
When adjusting move_cleanup_count to account for CPUs that are offline also
adjust old_cpu_mask, otherwise further calls to fixup_irqs() could subtract
those again and create an imbalance in move_cleanup_count.
Fixes: 472e0b74c5c4 ('x86/IRQ: deal with move cleanup count state in fixup_irqs()')
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/arch/x86/irq.c
+++ b/xen/arch/x86/irq.c
@@ -2576,6 +2576,14 @@ void fixup_irqs(const cpumask_t *mask, b
desc->arch.move_cleanup_count -= cpumask_weight(affinity);
if ( !desc->arch.move_cleanup_count )
release_old_vec(desc);
+ else
+ /*
+ * Adjust old_cpu_mask to account for the offline CPUs,
+ * otherwise further calls to fixup_irqs() could subtract those
+ * again and possibly underflow the counter.
+ */
+ cpumask_andnot(desc->arch.old_cpu_mask, desc->arch.old_cpu_mask,
+ affinity);
}
if ( !desc->action || cpumask_subset(desc->affinity, mask) )