proc: move /proc/vmallocinfo to mm/vmalloc.c

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Christoph Lameter <cl@linux-foundation.org>

1 files changed, 32 insertions, 1 deletions

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 65ae576030da..036536945dd9 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -15,6 +15,7 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
+#include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/debugobjects.h>
 #include <linux/kallsyms.h>
@@ -1718,11 +1719,41 @@ static int s_show(struct seq_file *m, void *p)
         return 0;
 }
 
-const struct seq_operations vmalloc_op = {
+static const struct seq_operations vmalloc_op = {
         .start = s_start,
         .next = s_next,
         .stop = s_stop,
         .show = s_show,
 };
+
+static int vmalloc_open(struct inode *inode, struct file *file)
+{
+        unsigned int *ptr = NULL;
+        int ret;
+
+        if (NUMA_BUILD)
+                ptr = kmalloc(nr_node_ids * sizeof(unsigned int), GFP_KERNEL);
+        ret = seq_open(file, &vmalloc_op);
+        if (!ret) {
+                struct seq_file *m = file->private_data;
+                m->private = ptr;
+        } else
+                kfree(ptr);
+        return ret;
+}
+
+static const struct file_operations proc_vmalloc_operations = {
+        .open           = vmalloc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release_private,
+};
+
+static int __init proc_vmalloc_init(void)
+{
+        proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
+        return 0;
+}
+module_init(proc_vmalloc_init);
 #endif