57b150cce8
irq_set_affinity() and move_masked_irq() try to assign affinity before calling chip set_affinity(). Some archs are assigning it in ->set_affinity() again. We do something like: cpumask_cpy(desc->affinity, mask); desc->chip->set_affinity(mask); But in the failure path, affinity should not be touched - otherwise we'll end up with a different affinity mask despite the failure to migrate the IRQ. So try to update the afffinity only if set_affinity returns with 0. Also call irq_set_thread_affinity accordingly. v2: update after "irq, x86: Remove IRQ_DISABLED check in process context IRQ move" v3: according to Ingo, change set_affinity() in irq_chip should return int. v4: update comments by removing moving irq_desc code. [ Impact: fix /proc/irq/*/smp_affinity setting corner case bug ] Signed-off-by: Yinghai Lu <yinghai@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Suresh Siddha <suresh.b.siddha@intel.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Rusty Russell <rusty@rustcorp.com.au> LKML-Reference: <49F65509.60307@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
|
|
#include <linux/irq.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include "internals.h"
|
|
|
|
void move_masked_irq(int irq)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
|
|
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
|
|
return;
|
|
|
|
/*
|
|
* Paranoia: cpu-local interrupts shouldn't be calling in here anyway.
|
|
*/
|
|
if (CHECK_IRQ_PER_CPU(desc->status)) {
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
desc->status &= ~IRQ_MOVE_PENDING;
|
|
|
|
if (unlikely(cpumask_empty(desc->pending_mask)))
|
|
return;
|
|
|
|
if (!desc->chip->set_affinity)
|
|
return;
|
|
|
|
assert_spin_locked(&desc->lock);
|
|
|
|
/*
|
|
* If there was a valid mask to work with, please
|
|
* do the disable, re-program, enable sequence.
|
|
* This is *not* particularly important for level triggered
|
|
* but in a edge trigger case, we might be setting rte
|
|
* when an active trigger is comming in. This could
|
|
* cause some ioapics to mal-function.
|
|
* Being paranoid i guess!
|
|
*
|
|
* For correct operation this depends on the caller
|
|
* masking the irqs.
|
|
*/
|
|
if (likely(cpumask_any_and(desc->pending_mask, cpu_online_mask)
|
|
< nr_cpu_ids))
|
|
if (!desc->chip->set_affinity(irq, desc->pending_mask)) {
|
|
cpumask_copy(desc->affinity, desc->pending_mask);
|
|
irq_set_thread_affinity(desc, desc->pending_mask);
|
|
}
|
|
|
|
cpumask_clear(desc->pending_mask);
|
|
}
|
|
|
|
void move_native_irq(int irq)
|
|
{
|
|
struct irq_desc *desc = irq_to_desc(irq);
|
|
|
|
if (likely(!(desc->status & IRQ_MOVE_PENDING)))
|
|
return;
|
|
|
|
if (unlikely(desc->status & IRQ_DISABLED))
|
|
return;
|
|
|
|
desc->chip->mask(irq);
|
|
move_masked_irq(irq);
|
|
desc->chip->unmask(irq);
|
|
}
|
|
|