proc: introduce proc_create_single{,_data}

Variants of proc_create{,_data} that directly take a seq_file show
callback and drastically reduces the boilerplate code in the callers.

All trivial callers converted over.

Signed-off-by: Christoph Hellwig <hch@lst.de>

kernel/irq/proc.c

@@ -185,11 +185,6 @@ static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
 	return single_open(file, irq_affinity_list_proc_show, PDE_DATA(inode));
 }
 
-static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, irq_affinity_hint_proc_show, PDE_DATA(inode));
-}
-
 static const struct file_operations irq_affinity_proc_fops = {
 	.open		= irq_affinity_proc_open,
 	.read		= seq_read,
@@ -198,13 +193,6 @@ static const struct file_operations irq_affinity_proc_fops = {
 	.write		= irq_affinity_proc_write,
 };
 
-static const struct file_operations irq_affinity_hint_proc_fops = {
-	.open		= irq_affinity_hint_proc_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
 static const struct file_operations irq_affinity_list_proc_fops = {
 	.open		= irq_affinity_list_proc_open,
 	.read		= seq_read,
@@ -223,32 +211,6 @@ static int irq_effective_aff_list_proc_show(struct seq_file *m, void *v)
 {
 	return show_irq_affinity(EFFECTIVE_LIST, m);
 }
-
-static int irq_effective_aff_proc_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, irq_effective_aff_proc_show, PDE_DATA(inode));
-}
-
-static int irq_effective_aff_list_proc_open(struct inode *inode,
-					    struct file *file)
-{
-	return single_open(file, irq_effective_aff_list_proc_show,
-			   PDE_DATA(inode));
-}
-
-static const struct file_operations irq_effective_aff_proc_fops = {
-	.open		= irq_effective_aff_proc_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
-static const struct file_operations irq_effective_aff_list_proc_fops = {
-	.open		= irq_effective_aff_list_proc_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
 #endif
 
 static int default_affinity_show(struct seq_file *m, void *v)
@@ -313,18 +275,6 @@ static int irq_node_proc_show(struct seq_file *m, void *v)
 	seq_printf(m, "%d\n", irq_desc_get_node(desc));
 	return 0;
 }
-
-static int irq_node_proc_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, irq_node_proc_show, PDE_DATA(inode));
-}
-
-static const struct file_operations irq_node_proc_fops = {
-	.open		= irq_node_proc_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
 #endif
 
 static int irq_spurious_proc_show(struct seq_file *m, void *v)
@@ -337,18 +287,6 @@ static int irq_spurious_proc_show(struct seq_file *m, void *v)
 	return 0;
 }
 
-static int irq_spurious_proc_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, irq_spurious_proc_show, PDE_DATA(inode));
-}
-
-static const struct file_operations irq_spurious_proc_fops = {
-	.open		= irq_spurious_proc_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
 #define MAX_NAMELEN 128
 
 static int name_unique(unsigned int irq, struct irqaction *new_action)
@@ -421,24 +359,24 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
 			 &irq_affinity_proc_fops, irqp);
 
 	/* create /proc/irq/<irq>/affinity_hint */
-	proc_create_data("affinity_hint", 0444, desc->dir,
-			 &irq_affinity_hint_proc_fops, irqp);
+	proc_create_single_data("affinity_hint", 0444, desc->dir,
+			irq_affinity_hint_proc_show, irqp);
 
 	/* create /proc/irq/<irq>/smp_affinity_list */
 	proc_create_data("smp_affinity_list", 0644, desc->dir,
 			 &irq_affinity_list_proc_fops, irqp);
 
-	proc_create_data("node", 0444, desc->dir,
-			 &irq_node_proc_fops, irqp);
+	proc_create_single_data("node", 0444, desc->dir, irq_node_proc_show,
+			irqp);
 # ifdef CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK
-	proc_create_data("effective_affinity", 0444, desc->dir,
-			 &irq_effective_aff_proc_fops, irqp);
-	proc_create_data("effective_affinity_list", 0444, desc->dir,
-			 &irq_effective_aff_list_proc_fops, irqp);
+	proc_create_single_data("effective_affinity", 0444, desc->dir,
+			irq_effective_aff_proc_show, irqp);
+	proc_create_single_data("effective_affinity_list", 0444, desc->dir,
+			irq_effective_aff_list_proc_show, irqp);
 # endif
 #endif
-	proc_create_data("spurious", 0444, desc->dir,
-			 &irq_spurious_proc_fops, (void *)(long)irq);
+	proc_create_single_data("spurious", 0444, desc->dir,
+			irq_spurious_proc_show, (void *)(long)irq);
 
 out_unlock:
 	mutex_unlock(&register_lock);