1 files changed, 13 insertions, 0 deletions

diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 3469f96bc8b2..28e3664fdf1b 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -7,6 +7,8 @@
 #include <linux/magic.h>
 #include <asm/atomic.h>
 
+struct completion;
+
 /*
  * The proc filesystem constants/structures
  */
@@ -56,6 +58,14 @@ struct proc_dir_entry {
         gid_t gid;
         loff_t size;
         const struct inode_operations *proc_iops;
+        /*
+         * NULL ->proc_fops means "PDE is going away RSN" or
+         * "PDE is just created". In either case, e.g. ->read_proc won't be
+         * called because it's too late or too early, respectively.
+         *
+         * If you're allocating ->proc_fops dynamically, save a pointer
+         * somewhere.
+         */
         const struct file_operations *proc_fops;
         get_info_t *get_info;
         struct module *owner;
@@ -66,6 +76,9 @@ struct proc_dir_entry {
         atomic_t count;         /* use count */
         int deleted;            /* delete flag */
         void *set;
+        int pde_users;  /* number of callers into module in progress */
+        spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
+        struct completion *pde_unload_completion;
 };
 
 struct kcore_list {