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docs: RCU: Don't duplicate chapter names in rculist_nulls.rst

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Since changeset 58ad30cf91 ("docs: fix reference to core-api/namespaces.rst"),
auto-references for chapters are generated. This is a nice feature, but
has a drawback: no chapters can have the same sumber.

So, we need to add two higher hierarchy chapters on this document,
in order to avoid such duplication.

Fixes: 58ad30cf91 ("docs: fix reference to core-api/namespaces.rst")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2020-04-21 19:04:11 +02:00 committed by Paul E. McKenney
parent f2286ab995
commit 2d9c318bfd
1 changed files with 6 additions and 0 deletions
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Documentation/RCU/rculist_nulls.rst
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@ -10,6 +10,9 @@ objects using SLAB_TYPESAFE_BY_RCU allocations.
Please read the basics in Documentation/RCU/listRCU.rst
Using 'nulls'
=============
Using special makers (called 'nulls') is a convenient way
to solve following problem :
@ -126,6 +129,9 @@ very very fast (before the end of RCU grace period)
--------------------------------------------------------------------------
Avoiding extra smp_rmb()
========================
With hlist_nulls we can avoid extra smp_rmb() in lockless_lookup()
and extra smp_wmb() in insert function.