[PATCH v3 3/3] backports: fix compilation error against v4.4 kernel

[AceLan Kao <acelan.kao@canonical.com>]

Add the smp_acquire__after_ctrl_dep macro to compat/lib-refcount.c to
fix the compilation error

/tmp/tmp.Z85sMNyuzD/backports-5.1-rc1-test1/backports-5.1-rc1/compat/lib-refcount.c:
In function 'backport_refcount_sub_and_test_checked':
/tmp/tmp.Z85sMNyuzD/backports-5.1-rc1-test1/backports-5.1-rc1/compat/lib-refcount.c:198:3:
error: implicit declaration of function 'smp_acquire__after_ctrl_dep'
[-Werror=implicit-function-declaration]
   smp_acquire__after_ctrl_dep();
   ^

Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
---
 patches/lib-refcount.patch | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/patches/lib-refcount.patch b/patches/lib-refcount.patch
index 28106342..ae568f8d 100644
--- a/patches/lib-refcount.patch
+++ b/patches/lib-refcount.patch
@@ -2,11 +2,15 @@ diff --git a/compat/lib-refcount.c b/compat/lib-refcount.c
 index 5d0582a..8d108f9 100644
 --- a/compat/lib-refcount.c
 +++ b/compat/lib-refcount.c
-@@ -39,6 +39,7 @@
+@@ -42,6 +42,11 @@
  #include <linux/refcount.h>
  #include <linux/spinlock.h>
  #include <linux/bug.h>
 +#include <linux/export.h>
++
++#ifndef smp_acquire__after_ctrl_dep
++#define smp_acquire__after_ctrl_dep()           smp_rmb()
++#endif
  
  /**
   * refcount_add_not_zero_checked - add a value to a refcount unless it is 0
-- 
2.17.1

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