1 files changed, 12 insertions, 7 deletions

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 3e636d864d56..dad0809db551 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -688,6 +688,13 @@ const struct file_operations proc_tid_smaps_operations = {
         .release        = seq_release_private,
 };
 
+enum clear_refs_types {
+        CLEAR_REFS_ALL = 1,
+        CLEAR_REFS_ANON,
+        CLEAR_REFS_MAPPED,
+        CLEAR_REFS_LAST,
+};
+
 static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
                                 unsigned long end, struct mm_walk *walk)
 {
@@ -719,10 +726,6 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
         return 0;
 }
 
-#define CLEAR_REFS_ALL 1
-#define CLEAR_REFS_ANON 2
-#define CLEAR_REFS_MAPPED 3
-
 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
                                 size_t count, loff_t *ppos)
 {
@@ -730,7 +733,8 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
         char buffer[PROC_NUMBUF];
         struct mm_struct *mm;
         struct vm_area_struct *vma;
-        int type;
+        enum clear_refs_types type;
+        int itype;
         int rv;
 
         memset(buffer, 0, sizeof(buffer));
@@ -738,10 +742,11 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
                 count = sizeof(buffer) - 1;
         if (copy_from_user(buffer, buf, count))
                 return -EFAULT;
-        rv = kstrtoint(strstrip(buffer), 10, &type);
+        rv = kstrtoint(strstrip(buffer), 10, &itype);
         if (rv < 0)
                 return rv;
-        if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED)
+        type = (enum clear_refs_types)itype;
+        if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
                 return -EINVAL;
         task = get_proc_task(file_inode(file));
         if (!task)