softirq: use const char * const for softirq_to_name, whitespace neatening

Reduce data size a little.
Reduce checkpatch noise.

$ size kernel/softirq.o*
   text	   data	    bss	    dec	    hex	filename
  11554	   6013	   4008	  21575	   5447	kernel/softirq.o.new
  11474	   6093	   4008	  21575	   5447	kernel/softirq.o.old

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index db43b58..0053add 100644 (file)
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -360,7 +360,7 @@ enum
 /* map softirq index to softirq name. update 'softirq_to_name' in
  * kernel/softirq.c when adding a new softirq.
  */
-extern char *softirq_to_name[NR_SOFTIRQS];
+extern const char * const softirq_to_name[NR_SOFTIRQS];
 
 /* softirq mask and active fields moved to irq_cpustat_t in
  * asm/hardirq.h to get better cache usage.  KAO

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 2674354..8509670 100644 (file)
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -56,7 +56,7 @@ static struct softirq_action softirq_vec[NR_SOFTIRQS] __cacheline_aligned_in_smp
 
 DEFINE_PER_CPU(struct task_struct *, ksoftirqd);
 
-char *softirq_to_name[NR_SOFTIRQS] = {
+const char * const softirq_to_name[NR_SOFTIRQS] = {
        "HI", "TIMER", "NET_TX", "NET_RX", "BLOCK", "BLOCK_IOPOLL",
        "TASKLET", "SCHED", "HRTIMER", "RCU"
 };
@@ -138,7 +138,6 @@ void _local_bh_enable(void)
        WARN_ON_ONCE(in_irq());
        __local_bh_enable(SOFTIRQ_DISABLE_OFFSET);
 }
-
 EXPORT_SYMBOL(_local_bh_enable);
 
 void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
@@ -155,7 +154,7 @@ void __local_bh_enable_ip(unsigned long ip, unsigned int cnt)
        /*
         * Keep preemption disabled until we are done with
         * softirq processing:
-        */
+        */
        preempt_count_sub(cnt - 1);
 
        if (unlikely(!in_interrupt() && local_softirq_pending())) {
@@ -436,8 +435,7 @@ void open_softirq(int nr, void (*action)(struct softirq_action *))
 /*
  * Tasklets
  */
-struct tasklet_head
-{
+struct tasklet_head {
        struct tasklet_struct *head;
        struct tasklet_struct **tail;
 };
@@ -456,7 +454,6 @@ void __tasklet_schedule(struct tasklet_struct *t)
        raise_softirq_irqoff(TASKLET_SOFTIRQ);
        local_irq_restore(flags);
 }
-
 EXPORT_SYMBOL(__tasklet_schedule);
 
 void __tasklet_hi_schedule(struct tasklet_struct *t)
@@ -470,7 +467,6 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
        raise_softirq_irqoff(HI_SOFTIRQ);
        local_irq_restore(flags);
 }
-
 EXPORT_SYMBOL(__tasklet_hi_schedule);
 
 void __tasklet_hi_schedule_first(struct tasklet_struct *t)
@@ -481,7 +477,6 @@ void __tasklet_hi_schedule_first(struct tasklet_struct *t)
        __this_cpu_write(tasklet_hi_vec.head, t);
        __raise_softirq_irqoff(HI_SOFTIRQ);
 }
-
 EXPORT_SYMBOL(__tasklet_hi_schedule_first);
 
 static void tasklet_action(struct softirq_action *a)
@@ -501,7 +496,8 @@ static void tasklet_action(struct softirq_action *a)
 
                if (tasklet_trylock(t)) {
                        if (!atomic_read(&t->count)) {
-                               if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
+                               if (!test_and_clear_bit(TASKLET_STATE_SCHED,
+                                                       &t->state))
                                        BUG();
                                t->func(t->data);
                                tasklet_unlock(t);
@@ -536,7 +532,8 @@ static void tasklet_hi_action(struct softirq_action *a)
 
                if (tasklet_trylock(t)) {
                        if (!atomic_read(&t->count)) {
-                               if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
+                               if (!test_and_clear_bit(TASKLET_STATE_SCHED,
+                                                       &t->state))
                                        BUG();
                                t->func(t->data);
                                tasklet_unlock(t);
@@ -554,7 +551,6 @@ static void tasklet_hi_action(struct softirq_action *a)
        }
 }
 
-
 void tasklet_init(struct tasklet_struct *t,
                  void (*func)(unsigned long), unsigned long data)
 {
@@ -564,7 +560,6 @@ void tasklet_init(struct tasklet_struct *t,
        t->func = func;
        t->data = data;
 }
-
 EXPORT_SYMBOL(tasklet_init);
 
 void tasklet_kill(struct tasklet_struct *t)
@@ -580,7 +575,6 @@ void tasklet_kill(struct tasklet_struct *t)
        tasklet_unlock_wait(t);
        clear_bit(TASKLET_STATE_SCHED, &t->state);
 }
-
 EXPORT_SYMBOL(tasklet_kill);
 
 /*
@@ -730,9 +724,8 @@ static void takeover_tasklets(unsigned int cpu)
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
-static int cpu_callback(struct notifier_block *nfb,
-                                 unsigned long action,
-                                 void *hcpu)
+static int cpu_callback(struct notifier_block *nfb, unsigned long action,
+                       void *hcpu)
 {
        switch (action) {
 #ifdef CONFIG_HOTPLUG_CPU