[v3,0/4] eal: update public API to use stdatomic atomics

  Update EAL public API to use standard C11 atomics. In accordance with
technical board discussion February 2023.
http://mails.dpdk.org/archives/dev/2023-February/263516.html

This initial series makes no attempt to adapt every use of builtin atomics
from GCC it intends only to adapt the public API of the EAL presented as
a compatibility surface to applications.

Further series will be submitted to adapt the rest of DPDK to use standard
atomics that are 'internal' and not do not straddle the EAL API.

The choice has been made to break these two changes apart to allow more
precise analysis of any potential performance impact this change or
subsequent changes may introduce.

Additionally, it is not possible to break the commits up per driver/lib as
both the provider and consumer of the APIs need to be changed in the same
commit to maintain non-broken build and function.

Finally, the first patch in this series is a duplication of Bruce Richardson
series https://patchwork.dpdk.org/project/dpdk/list/?series=29048 and is
only being provided to enable the CI run on this series. It is expected that
Bruce's series when committed will allow the build: require minimum c11 compiler
here to be dropped from this series.

v3:
  * restore incorrectly dropped architecture specific #include "rte_paused.h"
    for loongarch, ppc, riscv
  * convert parameters to stdatomic in RTE_WAIT_UNTIL_MASKED macro usage
    (missed previously)
  * lib/ring missed some conversion to stdatomic on struct rte_ring _Atomic
    fields (picked up by clang which is more strict than gcc)
  * drivers/mlx5 use stdatomic operations on struct rte_ring _Atomic fields
    (picked up by clang which is more strict than gcc)

v2:
  * remove volatile qualification from variables, structure fields and
    parameters that have been qualified _Atomic
  * restore removal of #include <rte_atomic.h> in rte_ring_core.h the ring
    library still uses other rte_atomic APIs and types that are not replaced
    by the standard or compiler intrinsics
  * add missing adaption to stdatomic in ring/rte_ring_c11_pvt.h

Tyler Retzlaff (4):
  build: require minimum c11 compiler
  devtools: forbid use of GCC atomic builtins
  eal: adapt rte pause APIs to use C11 atomics
  eal: adapt rte spinlock and rwlock APIs to use C11 atomics

 app/test-bbdev/test_bbdev_perf.c         | 123 ++++++++++++++++++++-----------
 app/test/test_func_reentrancy.c          |   8 +-
 app/test/test_mcslock.c                  |  12 +--
 app/test/test_mempool_perf.c             |   8 +-
 app/test/test_pflock.c                   |  12 +--
 app/test/test_pmd_perf.c                 |  10 +--
 app/test/test_ring_perf.c                |   8 +-
 app/test/test_rwlock.c                   |   8 +-
 app/test/test_spinlock.c                 |   8 +-
 app/test/test_stack_perf.c               |  12 +--
 app/test/test_ticketlock.c               |   8 +-
 app/test/test_timer.c                    |  16 ++--
 devtools/checkpatches.sh                 |   8 ++
 drivers/event/opdl/opdl_ring.c           |  47 ++++++------
 drivers/net/failsafe/meson.build         |   1 -
 drivers/net/mlx5/mlx5_hws_cnt.h          |   4 +-
 drivers/net/thunderx/nicvf_rxtx.c        |   5 +-
 drivers/net/thunderx/nicvf_struct.h      |   2 +-
 lib/bpf/bpf_pkt.c                        |   6 +-
 lib/distributor/distributor_private.h    |   2 +-
 lib/distributor/rte_distributor_single.c |  44 +++++------
 lib/eal/arm/include/rte_pause_64.h       |  28 +++----
 lib/eal/common/eal_common_errno.c        |   1 +
 lib/eal/common/eal_memcfg.h              |   2 +-
 lib/eal/include/generic/rte_pause.h      |  51 ++++++-------
 lib/eal/include/generic/rte_rwlock.h     |  46 ++++++------
 lib/eal/include/generic/rte_spinlock.h   |  21 +++---
 lib/eal/include/rte_mcslock.h            |  14 ++--
 lib/eal/include/rte_pflock.h             |  22 +++---
 lib/eal/include/rte_ticketlock.h         |   8 +-
 lib/eal/loongarch/include/rte_pause.h    |   2 +-
 lib/eal/ppc/include/rte_pause.h          |   2 +-
 lib/eal/riscv/include/rte_pause.h        |   2 +-
 lib/eal/x86/include/rte_spinlock.h       |   2 +-
 lib/ring/rte_ring_c11_pvt.h              |  42 ++++++-----
 lib/ring/rte_ring_core.h                 |   4 +-
 lib/ring/rte_ring_generic_pvt.h          |  19 +++--
 lib/ring/rte_ring_peek_elem_pvt.h        |   2 +-
 meson.build                              |   1 +
 39 files changed, 340 insertions(+), 281 deletions(-)