This is a minor space optimization. In practice I don't think
this has any affect because of our alignment constraints and
the other fields but there is not point in chewing up an
uncessary word and since we already read the flag field
this should improve the cache hit ratio of the irq handler.
Signed-off-by: Eric W. Biederman <[email protected]>
---
include/linux/irq.h | 5 +++--
kernel/irq/migration.c | 6 +++---
2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index c684bab..1ad1acb 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -45,6 +45,9 @@ #define IRQ_NOREQUEST 1024 /* IRQ cannot
#define IRQ_NOAUTOEN 2048 /* IRQ will not be enabled on request irq */
#define IRQ_DELAYED_DISABLE \
4096 /* IRQ disable (masking) happens delayed. */
+#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
+# define IRQ_MOVE_PENDING 8192 /* need to re-target IRQ destination */
+#endif
/*
* IRQ types, see also include/linux/interrupt.h
@@ -130,7 +133,6 @@ #endif
* @affinity: IRQ affinity on SMP
* @cpu: cpu index useful for balancing
* @pending_mask: pending rebalanced interrupts
- * @move_irq: need to re-target IRQ destination
* @dir: /proc/irq/ procfs entry
* @affinity_entry: /proc/irq/smp_affinity procfs entry on SMP
*
@@ -156,7 +158,6 @@ #ifdef CONFIG_SMP
#endif
#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)
cpumask_t pending_mask;
- unsigned int move_irq; /* need to re-target IRQ dest */
#endif
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *dir;
diff --git a/kernel/irq/migration.c b/kernel/irq/migration.c
index a57ebe9..9b234df 100644
--- a/kernel/irq/migration.c
+++ b/kernel/irq/migration.c
@@ -7,7 +7,7 @@ void set_pending_irq(unsigned int irq, c
unsigned long flags;
spin_lock_irqsave(&desc->lock, flags);
- desc->move_irq = 1;
+ desc->status |= IRQ_MOVE_PENDING;
irq_desc[irq].pending_mask = mask;
spin_unlock_irqrestore(&desc->lock, flags);
}
@@ -17,7 +17,7 @@ void move_native_irq(int irq)
struct irq_desc *desc = irq_desc + irq;
cpumask_t tmp;
- if (likely(!desc->move_irq))
+ if (likely(!(desc->status & IRQ_MOVE_PENDING)))
return;
/*
@@ -28,7 +28,7 @@ void move_native_irq(int irq)
return;
}
- desc->move_irq = 0;
+ desc->status &= ~IRQ_MOVE_PENDING;
if (unlikely(cpus_empty(irq_desc[irq].pending_mask)))
return;
--
1.4.0.gc07e
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
