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Date: Fri, 8 Aug 2008 14:52:46 -0700
From: Yinghai Lu <yhlu.kernel@...il.com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
Mike Travis <travis@....com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH 40/42] x86_64: make /proc/interrupts works with dyn irq_desc
loop with irq_desc list
Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
---
arch/x86/kernel/irq_64.c | 31 ++++++++++++++++++++++++-------
fs/proc/proc_misc.c | 28 ++++++++++++++++++++++++----
2 files changed, 48 insertions(+), 11 deletions(-)
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 7db6843..ef96ce7 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -70,9 +70,27 @@ static inline void stack_overflow_check(struct pt_regs *regs)
int show_interrupts(struct seq_file *p, void *v)
{
- int i = *(loff_t *) v, j;
+ int i, j;
struct irqaction * action;
unsigned long flags;
+ unsigned int entries;
+ struct irq_desc *desc;
+ int tail = 0;
+
+#ifdef CONFIG_HAVE_SPARSE_IRQ
+ desc = (struct irq_desc *)v;
+ entries = -1U;
+ i = desc->irq;
+ if (!desc->next)
+ tail = 1;
+#else
+ entries = nr_irqs - 1;
+ i = *(loff_t *) v;
+ if (i == nr_irqs)
+ tail = 1;
+ else
+ desc = irq_desc(i);
+#endif
if (i == 0) {
seq_printf(p, " ");
@@ -81,12 +99,8 @@ int show_interrupts(struct seq_file *p, void *v)
seq_putc(p, '\n');
}
- if (i < nr_irqs) {
+ if (i <= entries) {
unsigned any_count = 0;
- struct irq_desc *desc = irq_desc(i);
-
- if (!desc)
- return 0;
spin_lock_irqsave(&desc->lock, flags);
#ifndef CONFIG_SMP
@@ -116,7 +130,9 @@ int show_interrupts(struct seq_file *p, void *v)
seq_putc(p, '\n');
skip:
spin_unlock_irqrestore(&desc->lock, flags);
- } else if (i == nr_irqs) {
+ }
+
+ if (tail) {
seq_printf(p, "NMI: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
@@ -155,6 +171,7 @@ skip:
seq_printf(p, " Spurious interrupts\n");
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
}
+
return 0;
}
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index c9ee1f7..15901c7 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -633,15 +633,36 @@ static const struct file_operations proc_stat_operations = {
*/
static void *int_seq_start(struct seq_file *f, loff_t *pos)
{
+#ifdef CONFIG_HAVE_SPARSE_IRQ
+ struct irq_desc *desc;
+ int irq;
+ int count = *pos;
+
+ for_each_irq_desc(irq, desc) {
+ if (count-- == 0)
+ return desc;
+ }
+
+ return NULL;
+#else
return (*pos <= nr_irqs) ? pos : NULL;
+#endif
}
+
static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
{
+#ifdef CONFIG_HAVE_SPARSE_IRQ
+ struct irq_desc *desc;
+
+ desc = ((struct irq_desc *)v)->next;
(*pos)++;
- if (*pos > nr_irqs)
- return NULL;
- return pos;
+
+ return desc;
+#else
+ (*pos)++;
+ return (*pos <= nr_irqs) ? pos : NULL;
+#endif
}
static void int_seq_stop(struct seq_file *f, void *v)
@@ -649,7 +670,6 @@ static void int_seq_stop(struct seq_file *f, void *v)
/* Nothing to do */
}
-
static const struct seq_operations int_seq_ops = {
.start = int_seq_start,
.next = int_seq_next,
--
1.5.4.5
--
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