Blackfin arch: SMP supporting patchset: Blackfin kernel and memory management code
Blackfin dual core BF561 processor can support SMP like features.
https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like
In this patch, we provide SMP extend to Blackfin kernel and memory management code
Singed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
diff --git a/arch/blackfin/kernel/irqchip.c b/arch/blackfin/kernel/irqchip.c
index 07402f5..9eebb78 100644
--- a/arch/blackfin/kernel/irqchip.c
+++ b/arch/blackfin/kernel/irqchip.c
@@ -36,7 +36,7 @@
#include <linux/irq.h>
#include <asm/trace.h>
-static unsigned long irq_err_count;
+static atomic_t irq_err_count;
static spinlock_t irq_controller_lock;
/*
@@ -48,7 +48,7 @@
void ack_bad_irq(unsigned int irq)
{
- irq_err_count += 1;
+ atomic_inc(&irq_err_count);
printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
}
EXPORT_SYMBOL(ack_bad_irq);
@@ -72,7 +72,7 @@
int show_interrupts(struct seq_file *p, void *v)
{
- int i = *(loff_t *) v;
+ int i = *(loff_t *) v, j;
struct irqaction *action;
unsigned long flags;
@@ -80,19 +80,20 @@
spin_lock_irqsave(&irq_desc[i].lock, flags);
action = irq_desc[i].action;
if (!action)
- goto unlock;
-
- seq_printf(p, "%3d: %10u ", i, kstat_irqs(i));
+ goto skip;
+ seq_printf(p, "%3d: ", i);
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+ seq_printf(p, " %8s", irq_desc[i].chip->name);
seq_printf(p, " %s", action->name);
for (action = action->next; action; action = action->next)
- seq_printf(p, ", %s", action->name);
+ seq_printf(p, " %s", action->name);
seq_putc(p, '\n');
- unlock:
+ skip:
spin_unlock_irqrestore(&irq_desc[i].lock, flags);
- } else if (i == NR_IRQS) {
- seq_printf(p, "Err: %10lu\n", irq_err_count);
- }
+ } else if (i == NR_IRQS)
+ seq_printf(p, "Err: %10u\n", atomic_read(&irq_err_count));
return 0;
}
@@ -101,7 +102,6 @@
* come via this function. Instead, they should provide their
* own 'handler'
*/
-
#ifdef CONFIG_DO_IRQ_L1
__attribute__((l1_text))
#endif