linux-kernel - Re: [PATCH v3 1/3] Docs/RCU/rculist_nulls: Specify type of the object in examples

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Date:   Fri, 16 Jun 2023 18:54:11 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Alan Huang <mmpgouride@...il.com>
Cc:     SeongJae Park <sj@...nel.org>, paulmck@...nel.org,
        Joel Fernandes <joel@...lfernandes.org>, corbet@....net,
        rcu@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] Docs/RCU/rculist_nulls: Specify type of the object in examples

On Sat, 17 Jun 2023 01:46:16 +0800 Alan Huang <mmpgouride@...il.com> wrote:

> 
> > 2023年6月16日 02:10，SeongJae Park <sj@...nel.org> 写道：
> > 
> > The type of 'obj' in example code of rculist_nulls.rst is implicit.
> > Provide the specific type of it before the example code.
> > 
> > Suggested-by: aul E. McKenney <paulmck@...nel.org>
> 
> Paul E. McKenney

Oops, thank you for finding, and sorry, Paul :)

> 
> > Link: https://lore.kernel.org/rcu/43943609-f80c-4b6a-9844-994eef800757@paulmck-laptop/
> > Signed-off-by: SeongJae Park <sj@...nel.org>
> > ---
> > Documentation/RCU/rculist_nulls.rst | 14 +++++++++++++-
> > 1 file changed, 13 insertions(+), 1 deletion(-)
> > 
> > diff --git a/Documentation/RCU/rculist_nulls.rst b/Documentation/RCU/rculist_nulls.rst
> > index 94a8bfe9f560..4b66e2fd2fb5 100644
> > --- a/Documentation/RCU/rculist_nulls.rst
> > +++ b/Documentation/RCU/rculist_nulls.rst
> > @@ -18,7 +18,16 @@ to solve following problem.
> > 
> > Without 'nulls', a typical RCU linked list managing objects which are
> > allocated with SLAB_TYPESAFE_BY_RCU kmem_cache can use the following
> > -algorithms:
> > +algorithms.  Following examples assume 'obj' is a pointer to such
> > +objects, which is having below type.
> > +
> > +::
> > +
> > +  struct object {
> > +    struct hlist_node obj_node;
> > +    refcount_t refcnt;
> 
> atomic_t

I just recalled the example code uses atomic_set_release() for this field.

Thank you, Alan!

I will fix these in the next spin.


Thanks,
SJ

> 
> > +    unsigned int key;
> > +  };
> > 
> > 1) Lookup algorithm
> > -------------------
> > @@ -142,6 +151,9 @@ the beginning. If the object was moved to the same chain,
> > then the reader doesn't care: It might occasionally
> > scan the list again without harm.
> > 
> > +Note that using hlist_nulls means the type of 'obj_node' field of
> > +'struct object' becomes 'struct hlist_nulls_node'.
> > +
> > 
> > 1) lookup algorithm
> > -------------------
> > -- 
> > 2.25.1
> > 
> 
>