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x86/irq: Get rid of code duplication

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Reusing an existing vector and assigning a new vector has duplicated
code. Consolidate it.

This is also a preparatory patch for finally plugging the cleanup race.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Borislav Petkov <bp@alien8.de>
Tested-by: Joe Lawrence <joe.lawrence@stratus.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Jeremiah Mahler <jmmahler@gmail.com>
Cc: andy.shevchenko@gmail.com
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: stable@vger.kernel.org #4.3+
Link: http://lkml.kernel.org/r/20151231160106.721599216@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2015-12-31 16:30:49 +00:00
parent 9ac15b7a8a
commit ab25ac0214
1 changed files with 15 additions and 18 deletions
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33
arch/x86/kernel/apic/vector.c
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@ -118,7 +118,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
*/
static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START;
static int current_offset = VECTOR_OFFSET_START % 16;
int cpu;
int cpu, vector;
if (d->move_in_progress)
return -EBUSY;
@ -128,7 +128,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
cpumask_clear(searched_cpumask);
cpu = cpumask_first_and(mask, cpu_online_mask);
while (cpu < nr_cpu_ids) {
int new_cpu, vector, offset;
int new_cpu, offset;
/* Get the possible target cpus for @mask/@cpu from the apic */
apic->vector_allocation_domain(cpu, vector_cpumask, mask);
@ -148,16 +148,12 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d,
if (cpumask_equal(vector_cpumask, d->domain))
goto success;
/*
* New cpumask using the vector is a proper subset of
* the current in use mask. So cleanup the vector
* allocation for the members that are not used anymore.
* Mark the cpus which are not longer in the mask for
* cleanup.
*/
cpumask_andnot(d->old_domain, d->domain,
vector_cpumask);
d->move_in_progress =
cpumask_intersects(d->old_domain, cpu_online_mask);
cpumask_copy(d->domain, vector_cpumask);
goto success;
cpumask_andnot(d->old_domain, d->domain, vector_cpumask);
vector = d->cfg.vector;
goto update;
}
vector = current_vector;
@ -183,16 +179,12 @@ next:
/* Found one! */
current_vector = vector;
current_offset = offset;
if (d->cfg.vector) {
/* Schedule the old vector for cleanup on all cpus */
if (d->cfg.vector)
cpumask_copy(d->old_domain, d->domain);
d->move_in_progress =
cpumask_intersects(d->old_domain, cpu_online_mask);
}
for_each_cpu(new_cpu, vector_searchmask)
per_cpu(vector_irq, new_cpu)[vector] = irq_to_desc(irq);
d->cfg.vector = vector;
cpumask_copy(d->domain, vector_cpumask);
goto success;
goto update;
next_cpu:
/*
@ -209,6 +201,11 @@ next_cpu:
}
return -ENOSPC;
update:
/* Cleanup required ? */
d->move_in_progress = cpumask_intersects(d->old_domain, cpu_online_mask);
d->cfg.vector = vector;
cpumask_copy(d->domain, vector_cpumask);
success:
/*
* Cache destination APIC IDs into cfg->dest_apicid. This cannot fail