| 1 | Mathieu Desnoyers |
| 2 | May 13th, 2009 |
| 3 | |
| 4 | IBM Corporation allowed LGPLv2.1+ licensing of their contribution to the |
| 5 | userspace RCU library in a patch submitted on May 8, 2009 from Paul E. |
| 6 | McKenney and reviewed by Steven L. Bennett: |
| 7 | |
| 8 | https://lists.lttng.org/pipermail/lttng-dev/2009-May/012835.html |
| 9 | |
| 10 | I (Mathieu Desnoyers) re-implemented ACCESS_ONCE(), likely(), unlikely() and |
| 11 | barrier() from scratch without reference to the original code. |
| 12 | |
| 13 | commit id : 2dc5fa0f7cfbfb0a64a7a67b39626650e863f16a |
| 14 | |
| 15 | Bert Wesarg <bert.wesarg@googlemail.com> approved LGPL relicensing of his |
| 16 | patch in an email dated May 13, 2009 : |
| 17 | |
| 18 | http://lkml.org/lkml/2009/5/13/16 |
| 19 | |
| 20 | xchg() primitives has been rewritten from a MIT-licensed cmpxchg for Intel |
| 21 | and powerpc. They are MIT-licensed and therefore usable in LGPL code. |
| 22 | This cmpxchg code was obtained from the atomic_ops project: |
| 23 | |
| 24 | http://www.hpl.hp.com/research/linux/atomic_ops/ |
| 25 | |
| 26 | I (Mathieu Desnoyers) wrote the remainder of the code. |
| 27 | |
| 28 | The license for the library files in this project was therefore changed to |
| 29 | LGPLv2.1 on May 13, 2009, as detailed in LICENSE. |