x86_64: make /proc/interrupts work with dyn irq_desc

loop with irq_desc list

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 24 insertions, 4 deletions

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index c3cbabe8b38e..72dd739a7f8a 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -645,15 +645,36 @@ 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)
@@ -661,7 +682,6 @@ 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,