From 8a580f70f6936ec095da217018cdeeb5835c0207 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Thu, 31 Dec 2015 16:30:46 +0000 Subject: [PATCH] x86/irq: Do not use apic_chip_data.old_domain as temporary buffer Function __assign_irq_vector() makes use of apic_chip_data.old_domain as a temporary buffer, which is in the way of using apic_chip_data.old_domain for synchronizing the vector cleanup with the vector assignement code. Use a proper temporary cpumask for this. [ tglx: Renamed the mask to searched_cpumask for clarity ] Signed-off-by: Jiang Liu Tested-by: Borislav Petkov Tested-by: Joe Lawrence Cc: Jeremiah Mahler Cc: andy.shevchenko@gmail.com Cc: Guenter Roeck Cc: stable@vger.kernel.org #4.3+ Link: http://lkml.kernel.org/r/1450880014-11741-1-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner --- arch/x86/kernel/apic/vector.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index cf1e325b67ee..19082cf56616 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -31,7 +31,7 @@ struct apic_chip_data { struct irq_domain *x86_vector_domain; EXPORT_SYMBOL_GPL(x86_vector_domain); static DEFINE_RAW_SPINLOCK(vector_lock); -static cpumask_var_t vector_cpumask; +static cpumask_var_t vector_cpumask, searched_cpumask; static struct irq_chip lapic_controller; #ifdef CONFIG_X86_IO_APIC static struct apic_chip_data *legacy_irq_data[NR_IRQS_LEGACY]; @@ -126,6 +126,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, /* Only try and allocate irqs on cpus that are present */ err = -ENOSPC; cpumask_clear(d->old_domain); + cpumask_clear(searched_cpumask); cpu = cpumask_first_and(mask, cpu_online_mask); while (cpu < nr_cpu_ids) { int new_cpu, vector, offset; @@ -159,9 +160,9 @@ next: } if (unlikely(current_vector == vector)) { - cpumask_or(d->old_domain, d->old_domain, + cpumask_or(searched_cpumask, searched_cpumask, vector_cpumask); - cpumask_andnot(vector_cpumask, mask, d->old_domain); + cpumask_andnot(vector_cpumask, mask, searched_cpumask); cpu = cpumask_first_and(vector_cpumask, cpu_online_mask); continue; @@ -406,6 +407,7 @@ int __init arch_early_irq_init(void) arch_init_htirq_domain(x86_vector_domain); BUG_ON(!alloc_cpumask_var(&vector_cpumask, GFP_KERNEL)); + BUG_ON(!alloc_cpumask_var(&searched_cpumask, GFP_KERNEL)); return arch_early_ioapic_init(); } -- 2.20.1