Commit-ID: 8a580f70f6936ec095da217018cdeeb5835c0207
Gitweb: http://git.kernel.org/tip/8a580f70f6936ec095da217018cdeeb5835c0207
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
AuthorDate: Thu, 31 Dec 2015 16:30:46 +0000
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 15 Jan 2016 13:43:59 +0100
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 <jiang.liu@xxxxxxxxxxxxxxx>
Tested-by: Borislav Petkov <bp@xxxxxxxxx>
Tested-by: Joe Lawrence <joe.lawrence@xxxxxxxxxxx>
Cc: Jeremiah Mahler <jmmahler@xxxxxxxxx>
Cc: andy.shevchenko@xxxxxxxxx
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx #4.3+
Link: http://lkml.kernel.org/r/1450880014-11741-1-git-send-email-jiang.liu@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
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 cf1e325..19082cf 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();
}
--
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