asgardius/android_kernel_motorola_sm6225
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x86: Remove move_cleanup_count from irq_cfg

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move_cleanup_count for each irq in irq_cfg is keeping track of
the total number of cpus that need to free the corresponding
vectors associated with the irq which has now been migrated to
new destination. As long as this move_cleanup_count is non-zero
(i.e., as long as we have n't freed the vector allocations on
the old destinations) we were preventing the irq's further
migration.

This cleanup count is unnecessary and it is enough to not allow
the irq migration till we send the cleanup vector to the
previous irq destination, for which we already have irq_cfg's
move_in_progress.  All we need to make sure is that we free the
vector at the old desintation but we don't need to wait till
that gets freed.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Gary Hade <garyhade@us.ibm.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
LKML-Reference: <20091026230001.752968906@sbs-t61.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Suresh Siddha 2009-10-26 14:24:33 -08:00 committed by Ingo Molnar
parent 84e21493a3
commit 23359a88e7
2 changed files with 1 additions and 9 deletions
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1
arch/x86/include/asm/hw_irq.h
View file

@ -94,7 +94,6 @@ struct irq_cfg {
struct irq_pin_list *irq_2_pin;
cpumask_var_t domain;
cpumask_var_t old_domain;
unsigned move_cleanup_count;
u8 vector;
u8 move_in_progress : 1;
};

9
arch/x86/kernel/apic/io_apic.c
View file

@ -1161,7 +1161,7 @@ __assign_irq_vector(int irq, struct irq_cfg *cfg, const struct cpumask *mask)
int cpu, err;
cpumask_var_t tmp_mask;
if ((cfg->move_in_progress) || cfg->move_cleanup_count)
if (cfg->move_in_progress)
return -EBUSY;
if (!alloc_cpumask_var(&tmp_mask, GFP_ATOMIC))
@ -2234,14 +2234,10 @@ void send_cleanup_vector(struct irq_cfg *cfg)
if (unlikely(!alloc_cpumask_var(&cleanup_mask, GFP_ATOMIC))) {
unsigned int i;
cfg->move_cleanup_count = 0;
for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
cfg->move_cleanup_count++;
for_each_cpu_and(i, cfg->old_domain, cpu_online_mask)
apic->send_IPI_mask(cpumask_of(i), IRQ_MOVE_CLEANUP_VECTOR);
} else {
cpumask_and(cleanup_mask, cfg->old_domain, cpu_online_mask);
cfg->move_cleanup_count = cpumask_weight(cleanup_mask);
apic->send_IPI_mask(cleanup_mask, IRQ_MOVE_CLEANUP_VECTOR);
free_cpumask_var(cleanup_mask);
}
@ -2430,8 +2426,6 @@ asmlinkage void smp_irq_move_cleanup_interrupt(void)
cfg = irq_cfg(irq);
spin_lock(&desc->lock);
if (!cfg->move_cleanup_count)
goto unlock;
if (vector == cfg->vector && cpumask_test_cpu(me, cfg->domain))
goto unlock;
@ -2449,7 +2443,6 @@ asmlinkage void smp_irq_move_cleanup_interrupt(void)
goto unlock;
}
__get_cpu_var(vector_irq)[vector] = -1;
cfg->move_cleanup_count--;
unlock:
spin_unlock(&desc->lock);
}