From 0394c463a6b5b3ba15aa7061356398347677f60a Mon Sep 17 00:00:00 2001
From: Don Brady <don.brady@delphix.com>
Date: Wed, 7 Dec 2022 14:08:36 -0700
Subject: [PATCH] DLPX-83701 Make function mnt_add_count() traceable (#24)

---
 fs/namespace.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index 80303001bcd9c..000a92c95ab09 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -163,7 +163,7 @@ void mnt_release_group_id(struct mount *mnt)
 /*
  * vfsmount lock must be held for read
  */
-static inline void mnt_add_count(struct mount *mnt, int n)
+static noinline __noclone void mnt_add_count(struct mount *mnt, int n)
 {
 #ifdef CONFIG_SMP
 	this_cpu_add(mnt->mnt_pcp->mnt_count, n);
@@ -1590,7 +1590,8 @@ static int do_umount_root(struct super_block *sb)
 	return ret;
 }
 
-static int do_umount(struct mount *mnt, int flags)
+/* force a bpftrace dynamic function probe here */
+static noinline __noclone int do_umount(struct mount *mnt, int flags)
 {
 	struct super_block *sb = mnt->mnt.mnt_sb;
 	int retval;