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doc: announce adoption of C11 atomic operations semantics

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As agreed in the DPDK tech board [1], after 20.05 release, patches must
use C11 atomic operations semantics with the help of wrappers.

[1] http://mails.dpdk.org/archives/dev/2020-April/165143.html

Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Phil Yang <phil.yang@arm.com>
Reviewed-by: Ruifeng Wang <ruifeng.wang@arm.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
Acked-by: David Christensen <drc@linux.vnet.ibm.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
This commit is contained in:
Honnappa Nagarahalli 2020-05-21 23:30:13 -05:00 committed by Thomas Monjalon
parent b706e25667
commit 7518c5c4ae
1 changed files with 13 additions and 0 deletions
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doc/guides/rel_notes/deprecation.rst
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@ -38,6 +38,19 @@ Deprecation Notices
remove it from the externally visible ABI and allow it to be updated in the remove it from the externally visible ABI and allow it to be updated in the
future. future.
* rte_atomicNN_xxx: These APIs do not take memory order parameter. This does
not allow for writing optimized code for all the CPU architectures supported
in DPDK. DPDK will adopt C11 atomic operations semantics and provide wrappers
using C11 atomic built-ins. These wrappers must be used for patches that
need to be merged in 20.08 onwards. This change will not introduce any
performance degradation.
* rte_smp_*mb: These APIs provide full barrier functionality. However, many
use cases do not require full barriers. To support such use cases, DPDK will
adopt C11 barrier semantics and provide wrappers using C11 atomic built-ins.
These wrappers must be used for patches that need to be merged in 20.08
onwards. This change will not introduce any performance degradation.
* igb_uio: In the view of reducing the kernel dependency from the main tree, * igb_uio: In the view of reducing the kernel dependency from the main tree,
as a first step, the Technical Board decided to move ``igb_uio`` as a first step, the Technical Board decided to move ``igb_uio``
kernel module to the dpdk-kmods repository in the /linux/igb_uio/ directory kernel module to the dpdk-kmods repository in the /linux/igb_uio/ directory