proc: remove ifdef CONFIG_SPARSE_IRQ from stat.c

Impact: cleanup

irq_desc can be NULL when CONFIG_SPARSE_IRQ=y only.
therefore, NULL checking can move into kstat_irqs_cpu() of SPARSE_IRQ version.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: "Yinghai Lu" <yinghai@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 2 insertions, 11 deletions

diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 3bb1cf1e7425..f75efa22df5e 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -9,6 +9,7 @@
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/time.h>
+#include <linux/irqnr.h>
 #include <asm/cputime.h>
 
 #ifndef arch_irq_stat_cpu
@@ -45,10 +46,6 @@ static int show_stat(struct seq_file *p, void *v)
                 steal = cputime64_add(steal, kstat_cpu(i).cpustat.steal);
                 guest = cputime64_add(guest, kstat_cpu(i).cpustat.guest);
                 for_each_irq_nr(j) {
-#ifdef CONFIG_SPARSE_IRQ
-                        if (!irq_to_desc(j))
-                                continue;
-#endif
                         sum += kstat_irqs_cpu(j, i);
                 }
                 sum += arch_irq_stat_cpu(i);
@@ -95,12 +92,6 @@ static int show_stat(struct seq_file *p, void *v)
         /* sum again ? it could be updated? */
         for_each_irq_nr(j) {
                 per_irq_sum = 0;
-#ifdef CONFIG_SPARSE_IRQ
-                if (!irq_to_desc(j)) {
-                        seq_printf(p, " %u", per_irq_sum);
-                        continue;
-                }
-#endif
                 for_each_possible_cpu(i)
                         per_irq_sum += kstat_irqs_cpu(j, i);
 
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 4db7d2df86b6..03479dfdebb8 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -448,7 +448,7 @@ void early_init_irq_lock_class(void)
 unsigned int kstat_irqs_cpu(unsigned int irq, int cpu)
 {
         struct irq_desc *desc = irq_to_desc(irq);
-        return desc->kstat_irqs[cpu];
+        return desc ? desc->kstat_irqs[cpu] : 0;
 }
 #endif
 EXPORT_SYMBOL(kstat_irqs_cpu);