1 files changed, 75 insertions, 129 deletions

diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 1d24fead51a6..5c10ea157425 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -249,144 +249,60 @@ static int cpuinfo_open(struct inode *inode, struct file *file)
 	return seq_open(file, &cpuinfo_op);
 }
 
-enum devinfo_states {
-	CHR_HDR,
-	CHR_LIST,
-	BLK_HDR,
-	BLK_LIST,
-	DEVINFO_DONE
-};
-
-struct devinfo_state {
-	void *chrdev;
-	void *blkdev;
-	unsigned int num_records;
-	unsigned int cur_record;
-	enum devinfo_states state;
+static struct file_operations proc_cpuinfo_operations = {
+	.open		= cpuinfo_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
 };
 
-static void *devinfo_start(struct seq_file *f, loff_t *pos)
+static int devinfo_show(struct seq_file *f, void *v)
 {
-	struct devinfo_state *info = f->private;
+	int i = *(loff_t *) v;
 
-	if (*pos) {
-		if ((info) && (*pos <= info->num_records))
-			return info;
-		return NULL;
+	if (i < CHRDEV_MAJOR_HASH_SIZE) {
+		if (i == 0)
+			seq_printf(f, "Character devices:\n");
+		chrdev_show(f, i);
+	} else {
+		i -= CHRDEV_MAJOR_HASH_SIZE;
+		if (i == 0)
+			seq_printf(f, "\nBlock devices:\n");
+		blkdev_show(f, i);
 	}
-	info = kmalloc(sizeof(*info), GFP_KERNEL);
-	f->private = info;
-	info->chrdev = acquire_chrdev_list();
-	info->blkdev = acquire_blkdev_list();
-	info->state = CHR_HDR;
-	info->num_records = count_chrdev_list();
-	info->num_records += count_blkdev_list();
-	info->num_records += 2; /* Character and Block headers */
-	*pos = 1;
-	info->cur_record = *pos;
-	return info;
+	return 0;
 }
 
-static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
+static void *devinfo_start(struct seq_file *f, loff_t *pos)
 {
-	int idummy;
-	char *ndummy;
-	struct devinfo_state *info = f->private;
-
-	switch (info->state) {
-		case CHR_HDR:
-			info->state = CHR_LIST;
-			(*pos)++;
-			/*fallthrough*/
-		case CHR_LIST:
-			if (get_chrdev_info(info->chrdev,&idummy,&ndummy)) {
-				/*
-				 * The character dev list is complete
-				 */
-				info->state = BLK_HDR;
-			} else {
-				info->chrdev = get_next_chrdev(info->chrdev);
-			}
-			(*pos)++;
-			break;
-		case BLK_HDR:
-			info->state = BLK_LIST;
-			(*pos)++;
-			break;
-		case BLK_LIST:
-			if (get_blkdev_info(info->blkdev,&idummy,&ndummy)) {
-				/*
-				 * The block dev list is complete
-				 */
-				info->state = DEVINFO_DONE;
-			} else {
-				info->blkdev = get_next_blkdev(info->blkdev);
-			}
-			(*pos)++;
-			break;
-		case DEVINFO_DONE:
-			(*pos)++;
-			info->cur_record = *pos;
-			info = NULL;
-			break;
-		default:
-			break;
-	}
-	if (info)
-		info->cur_record = *pos;
-	return info;
+	if (*pos < (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
+		return pos;
+	return NULL;
 }
 
-static void devinfo_stop(struct seq_file *f, void *v)
+static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos)
 {
-	struct devinfo_state *info = f->private;
-
-	if (info) {
-		release_chrdev_list(info->chrdev);
-		release_blkdev_list(info->blkdev);
-		f->private = NULL;
-		kfree(info);
-	}
+	(*pos)++;
+	if (*pos >= (BLKDEV_MAJOR_HASH_SIZE + CHRDEV_MAJOR_HASH_SIZE))
+		return NULL;
+	return pos;
 }
 
-static int devinfo_show(struct seq_file *f, void *arg)
-{
-	int major;
-	char *name;
-	struct devinfo_state *info = f->private;
-
-	switch(info->state) {
-		case CHR_HDR:
-			seq_printf(f,"Character devices:\n");
-			/* fallthrough */
-		case CHR_LIST:
-			if (!get_chrdev_info(info->chrdev,&major,&name))
-				seq_printf(f,"%3d %s\n",major,name);
-			break;
-		case BLK_HDR:
-			seq_printf(f,"\nBlock devices:\n");
-			/* fallthrough */
-		case BLK_LIST:
-			if (!get_blkdev_info(info->blkdev,&major,&name))
-				seq_printf(f,"%3d %s\n",major,name);
-			break;
-		default:
-			break;
-	}
-
-	return 0;
+static void devinfo_stop(struct seq_file *f, void *v)
+{
+	/* Nothing to do */
 }
 
-static  struct seq_operations devinfo_op = {
-	.start  = devinfo_start,
-	.next   = devinfo_next,
-	.stop   = devinfo_stop,
-	.show   = devinfo_show,
+static struct seq_operations devinfo_ops = {
+	.start = devinfo_start,
+	.next  = devinfo_next,
+	.stop  = devinfo_stop,
+	.show  = devinfo_show
 };
 
-static int devinfo_open(struct inode *inode, struct file *file)
+static int devinfo_open(struct inode *inode, struct file *filp)
 {
-	return seq_open(file, &devinfo_op);
+	return seq_open(filp, &devinfo_ops);
 }
 
 static struct file_operations proc_devinfo_operations = {
@@ -396,13 +312,6 @@ static struct file_operations proc_devinfo_operations = {
 	.release	= seq_release,
 };
 
-static struct file_operations proc_cpuinfo_operations = {
-	.open		= cpuinfo_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release,
-};
-
 extern struct seq_operations vmstat_op;
 static int vmstat_open(struct inode *inode, struct file *file)
 {
@@ -485,6 +394,40 @@ static struct file_operations proc_slabinfo_operations = {
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };
+
+#ifdef CONFIG_DEBUG_SLAB_LEAK
+extern struct seq_operations slabstats_op;
+static int slabstats_open(struct inode *inode, struct file *file)
+{
+	unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL);
+	int ret = -ENOMEM;
+	if (n) {
+		ret = seq_open(file, &slabstats_op);
+		if (!ret) {
+			struct seq_file *m = file->private_data;
+			*n = PAGE_SIZE / (2 * sizeof(unsigned long));
+			m->private = n;
+			n = NULL;
+		}
+		kfree(n);
+	}
+	return ret;
+}
+
+static int slabstats_release(struct inode *inode, struct file *file)
+{
+	struct seq_file *m = file->private_data;
+	kfree(m->private);
+	return seq_release(inode, file);
+}
+
+static struct file_operations proc_slabstats_operations = {
+	.open		= slabstats_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= slabstats_release,
+};
+#endif
 #endif
 
 static int show_stat(struct seq_file *p, void *v)
@@ -500,7 +443,7 @@ static int show_stat(struct seq_file *p, void *v)
 	if (wall_to_monotonic.tv_nsec)
 		--jif;
 
-	for_each_cpu(i) {
+	for_each_possible_cpu(i) {
 		int j;
 
 		user = cputime64_add(user, kstat_cpu(i).cpustat.user);
@@ -697,7 +640,7 @@ static struct file_operations proc_sysrq_trigger_operations = {
 
 struct proc_dir_entry *proc_root_kcore;
 
-void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
+void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 {
 	struct proc_dir_entry *entry;
 	entry = create_proc_entry(name, mode, NULL);
@@ -744,6 +687,9 @@ void __init proc_misc_init(void)
 	create_seq_entry("interrupts", 0, &proc_interrupts_operations);
 #ifdef CONFIG_SLAB
 	create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
+#ifdef CONFIG_DEBUG_SLAB_LEAK
+	create_seq_entry("slab_allocators", 0 ,&proc_slabstats_operations);
+#endif
 #endif
 	create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
 	create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);