summaryrefslogtreecommitdiff
path: root/kernel/irq
diff options
context:
space:
mode:
authorMatt Redfearn <matt.redfearn@imgtec.com>2016-04-25 08:14:23 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-05-02 13:42:50 +0200
commit01292cea0df86ed4a1eb6450d6eda375ef925716 (patch)
treefc5b2e42c595619148acc40f59a5937ade2450d2 /kernel/irq
parentb75a2bf899b668b1d52de8846aafdbcf81349c73 (diff)
downloadlinux-sh-01292cea0df86ed4a1eb6450d6eda375ef925716.tar.gz
genirq: Make irq_destroy_ipi take a cpumask of IPIs to destroy
Previously irq_destroy_ipi() would destroy IPIs to all CPUs that were configured by irq_reserve_ipi(). This change makes it possible to destroy just a subset of the IPIs. This may be useful to remove IPIs to CPUs that have been hot removed so that the IRQ numbers allocated within the IPI domain can be re-used. The original behaviour is restored by passing the complete mask that the IPI was created with. There are currently no users of this function that would break from the API change. Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Cc: linux-mips@linux-mips.org Cc: jason@lakedaemon.net Cc: marc.zyngier@arm.com Cc: ralf@linux-mips.org Cc: Qais Yousef <qsyousef@gmail.com> Cc: lisa.parratt@imgtec.com Cc: jiang.liu@linux.intel.com Link: http://lkml.kernel.org/r/1461568464-31701-1-git-send-email-matt.redfearn@imgtec.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/ipi.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/kernel/irq/ipi.c b/kernel/irq/ipi.c
index 14777af8e097..bedc995ae214 100644
--- a/kernel/irq/ipi.c
+++ b/kernel/irq/ipi.c
@@ -106,11 +106,12 @@ free_descs:
/**
* irq_destroy_ipi() - unreserve an IPI that was previously allocated
* @irq: linux irq number to be destroyed
+ * @dest: cpumask of cpus which should have the IPI removed
*
* Return the IPIs allocated with irq_reserve_ipi() to the system destroying
* all virqs associated with them.
*/
-void irq_destroy_ipi(unsigned int irq)
+void irq_destroy_ipi(unsigned int irq, const struct cpumask *dest)
{
struct irq_data *data = irq_get_irq_data(irq);
struct cpumask *ipimask = data ? irq_data_get_affinity_mask(data) : NULL;
@@ -129,10 +130,19 @@ void irq_destroy_ipi(unsigned int irq)
return;
}
- if (irq_domain_is_ipi_per_cpu(domain))
- nr_irqs = cpumask_weight(ipimask);
- else
+ if (WARN_ON(!cpumask_subset(dest, ipimask)))
+ /*
+ * Must be destroying a subset of CPUs to which this IPI
+ * was set up to target
+ */
+ return;
+
+ if (irq_domain_is_ipi_per_cpu(domain)) {
+ irq = irq + cpumask_first(dest) - data->common->ipi_offset;
+ nr_irqs = cpumask_weight(dest);
+ } else {
nr_irqs = 1;
+ }
irq_domain_free_irqs(irq, nr_irqs);
}