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