[PATCH v3 0/1] ring: correct ordering issue in head/tail update

[Konstantin Ananyev <konstantin.ananyev@huawei.com>]

This patch fixes a subtle ordering issue in the ring code that can lead
to incorrect behavior under certain conditions. The change adopts a
solution that balances performance with compatibility for dependent
libraries.

For background, motivation, and validation (including Herd7 litmus
tests), see the accompanying write-up:
https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/when-a-barrier-does-not-block-the-pitfalls-of-partial-order

V1->V2:
  * Switched from squashing unsafe partial orders (solution #3) to
  * establishing a pairwise happens-before relationship between the
  * producer and consumer heads (solution #2).

V2->V3 (Konstantin):
  * Added Fixes and CC to stable
  * Extend patch to cover HTS and RTS mode

Wathsala Vithanage (1):
  ring: fix unsafe ordering for head/tail update

 lib/ring/rte_ring_c11_pvt.h      | 9 +++------
 lib/ring/rte_ring_hts_elem_pvt.h | 6 ++++--
 lib/ring/rte_ring_rts_elem_pvt.h | 6 ++++--
 3 files changed, 11 insertions(+), 10 deletions(-)

-- 
2.51.0