[PATCH] export symbol mount_lock

[Jay Lan <jay.j.lan@xxxxxxxx>]

Hi all,

I was writing a livepatch patch, but compilation failed in creating the 
.ko because mount_lock is "undefined."

The mount_lock is defined globally in fs/namespace.c
__cacheline_aligned_in_smp DEFINE_SEQLOCK(mount_lock);

and extern in fs/mount.h.
extern seqlock_t mount_lock;

If there is a reason that mount_lock should not be EXPORT_SYMBOL_GPL, 
please advise; otherwise, I propose the patch to export this symbol.

Signed-off-by: Jay Lan <jay.j.lan@xxxxxxxx>
---
 fs/namespace.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/namespace.c b/fs/namespace.c
index 5a4438445bf7..3bbb619391ce 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -83,6 +83,7 @@ EXPORT_SYMBOL_GPL(fs_kobj);
  * tree or hash is modified or when a vfsmount structure is modified.
  */
 __cacheline_aligned_in_smp DEFINE_SEQLOCK(mount_lock);
+EXPORT_SYMBOL_GPL(mount_lock);

 static inline struct hlist_head *m_hash(struct vfsmount *mnt, struct 
dentry *dentry)
 {