sparseirq: fix Alpha build failure

Impact: build fix on Alpha

-tip testing found this build failure on the Alpha defconfig:

/home/mingo/tip/fs/proc/stat.c: In function 'show_stat':
/home/mingo/tip/fs/proc/stat.c:48: error: implicit declaration of function 'for_each_irq_desc'
/home/mingo/tip/fs/proc/stat.c:48: error: expected ';' before '{' token

can not use irq_desc() in stat.c on older architectures.

Signed-off-by: Yinghai Lu <yinghai@kernel.orgg>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 29 insertions, 19 deletions

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index a13431ab7c65..3cb9492801c0 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -45,9 +45,12 @@ static int show_stat(struct seq_file *p, void *v)
                 softirq = cputime64_add(softirq, kstat_cpu(i).cpustat.softirq);
                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
-                for_each_irq_desc(j, desc) {
+                for_each_irq_nr(j) {
+#ifdef CONFIG_SPARSE_IRQ
+                        desc = irq_to_desc(j);
                         if (!desc)
                                 continue;
+#endif
                         sum += kstat_irqs_cpu(j, i);
                 }
                 sum += arch_irq_stat_cpu(i);
@@ -92,14 +95,17 @@ static int show_stat(struct seq_file *p, void *v)
         seq_printf(p, "intr %llu", (unsigned long long)sum);
 
         /* sum again ? it could be updated? */
-        for (j = 0; j < NR_IRQS; j++) {
-                desc = irq_to_desc(j);
+        for_each_irq_nr(j) {
                 per_irq_sum = 0;
-
-                if (desc) {
-                        for_each_possible_cpu(i)
-                                per_irq_sum += kstat_irqs_cpu(j, i);
+#ifdef CONFIG_SPARSE_IRQ
+                desc = irq_to_desc(j);
+                if (!desc) {
+                        seq_printf(p, " %u", per_irq_sum);
+                        continue;
                 }
+#endif
+                for_each_possible_cpu(i)
+                        per_irq_sum += kstat_irqs_cpu(j, i);
 
                 seq_printf(p, " %u", per_irq_sum);
         }
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 63b00439d4d2..b5749db3e5a1 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -198,7 +198,6 @@ extern void arch_init_copy_chip_data(struct irq_desc *old_desc,
 extern void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc);
 
 #ifndef CONFIG_SPARSE_IRQ
-
 extern struct irq_desc irq_desc[NR_IRQS];
 
 static inline struct irq_desc *irq_to_desc(unsigned int irq)
@@ -210,14 +209,6 @@ static inline struct irq_desc *irq_to_desc_alloc_cpu(unsigned int irq, int cpu)
         return irq_to_desc(irq);
 }
 
-#ifdef CONFIG_GENERIC_HARDIRQS
-# define for_each_irq_desc(irq, desc)           \
-        for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
-# define for_each_irq_desc_reverse(irq, desc)                          \
-        for (irq = nr_irqs - 1, desc = irq_desc + (nr_irqs - 1);        \
-            irq >= 0; irq--, desc--)
-#endif
-
 #else
 
 extern struct irq_desc *irq_to_desc(unsigned int irq);
diff --git a/include/linux/irqnr.h b/include/linux/irqnr.h
index 7a299e989f8b..13754f813589 100644
--- a/include/linux/irqnr.h
+++ b/include/linux/irqnr.h
@@ -8,9 +8,22 @@
 # define for_each_irq_desc(irq, desc)           \
         for (irq = 0; irq < nr_irqs; irq++)
 
-static inline early_sparse_irq_init(void)
-{
-}
+# define for_each_irq_desc_reverse(irq, desc)                          \
+        for (irq = nr_irqs - 1; irq >= 0; irq--)
+#else
+#ifndef CONFIG_SPARSE_IRQ
+
+struct irq_desc;
+extern int nr_irqs;
+# define for_each_irq_desc(irq, desc)           \
+        for (irq = 0, desc = irq_desc; irq < nr_irqs; irq++, desc++)
+# define for_each_irq_desc_reverse(irq, desc)                          \
+        for (irq = nr_irqs - 1, desc = irq_desc + (nr_irqs - 1);        \
+            irq >= 0; irq--, desc--)
 #endif
+#endif
+
+#define for_each_irq_nr(irq)                   \
+       for (irq = 0; irq < nr_irqs; irq++)
 
 #endif