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* [dpdk-dev] [PATCH] doc: announce adoption of C11 atomic operations semantics
@ 2020-05-07  7:06 Phil Yang
  2020-05-07 21:00 ` Stephen Hemminger
                   ` (4 more replies)
  0 siblings, 5 replies; 11+ messages in thread
From: Phil Yang @ 2020-05-07  7:06 UTC (permalink / raw)
  To: dev
  Cc: bruce.richardson, ferruh.yigit, hemant.agrawal,
	honnappa.nagarahalli, jerinj, ktraynor, konstantin.ananyev,
	maxime.coquelin, olivier.matz, stephen, thomas, phil.yang,
	ruifeng.wang, nd

From: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

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>
---
 doc/guides/rel_notes/deprecation.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 20aa745..208708d 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -113,3 +113,15 @@ Deprecation Notices
   Python 2 support will be completely removed in 20.11.
   In 20.08, explicit deprecation warnings will be displayed when running
   scripts with Python 2.
+
+* 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.
+
+* 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.
-- 
2.7.4


^ permalink raw reply	[flat|nested] 11+ messages in thread

end of thread, other threads:[~2020-05-24 23:54 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-05-07  7:06 [dpdk-dev] [PATCH] doc: announce adoption of C11 atomic operations semantics Phil Yang
2020-05-07 21:00 ` Stephen Hemminger
2020-05-08  3:46   ` Honnappa Nagarahalli
2020-05-21  4:31 ` Honnappa Nagarahalli
2020-05-21  5:04   ` Hemant Agrawal
2020-05-21  4:56 ` Jerin Jacob
2020-05-21 10:33   ` Ananyev, Konstantin
2020-05-21 19:34 ` David Christensen
2020-05-22  4:30 ` [dpdk-dev] [PATCH v2] " Honnappa Nagarahalli
2020-05-22  8:37   ` Ananyev, Konstantin
2020-05-24 23:54     ` Thomas Monjalon

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