| #ifndef __BACKPORT_KREF_H |
| #define __BACKPORT_KREF_H |
| #include_next <linux/kref.h> |
| #include <linux/version.h> |
| |
| #if LINUX_VERSION_CODE < KERNEL_VERSION(3,8,0) |
| #include <linux/atomic.h> |
| |
| /* This was backported to some kernels (e.g. 3.2.44 and 3.4.41), mask it */ |
| #define kref_get_unless_zero LINUX_BACKPORT(kref_get_unless_zero) |
| |
| /* This backports: |
| * |
| * commit 4b20db3de8dab005b07c74161cb041db8c5ff3a7 |
| * Author: Thomas Hellstrom <thellstrom@vmware.com> |
| * Date: Tue Nov 6 11:31:49 2012 +0000 |
| * |
| * kref: Implement kref_get_unless_zero v3 |
| */ |
| static inline int __must_check kref_get_unless_zero(struct kref *kref) |
| { |
| return atomic_add_unless(&kref->refcount, 1, 0); |
| } |
| #endif |
| |
| #endif /* __BACKPORT_KREF_H */ |
