linux-kernel - Re: [PATCH tip/core/rcu 0/52] Remove rcu

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Message-ID: <20180829220026.3579e9a1@vmware.local.home>
Date:   Wed, 29 Aug 2018 22:00:26 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org
Subject: Re: [PATCH tip/core/rcu 0/52] Remove rcu_state pointers for
 v4.20/v5.0

On Wed, 29 Aug 2018 15:38:30 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> Hello!
> 
> This commit does RCU-consolidation cleanups that get rid of pointers to
> the sole remaining rcu_state structure:
> 
> 1-40:	Remove the "rsp" parameter from numerous functions, given that
> 	the corresponding argument will always be &rcu_state.

Hmm, couldn't 1-40 have been made into a single patch?

-- Steve

> 
> 41.	Remove rcu_data structure's ->rsp field, now that it always
> 	contains a pointer to rcu_state.
> 
> 42.	Remove non-flavor-traversal rsp local variable from tree_plugin.h.
> 
> 43.	Remove the for_each_rcu_flavor() flavor-traversal macro, given
> 	that there is now only ever one flavor to traverse.
> 
> 44.	Simplify rcutorture_get_gp_data() based on there now being only
> 	one rcu_state structure.
> 
> 45.	Restructure rcu_check_gp_kthread_starvation() based on there
> 	now being only one rcu_state structure.
> 
> 46.	Restructure RCU CPU stall warnings based on there now being only
> 	one rcu_state structure.
> 
> 47.	Restructure grace-period management code based on there now being
> 	only one rcu_state structure.
> 
> 48.	Restructure callback registration/invocation code based on there
> 	now being only one rcu_state structure.
> 
> 49.	Restructure quiescent-state and grace-period-nonstart code based
> 	on there now being only one rcu_state structure.
> 
> 50.	Restructure rcu_barrier() based on there now being only one
> 	rcu_state structure.
> 
> 51.	Restructure initialization code based on there now being only
> 	one rcu_state structure.
> 
> 52.	Fix typo in force_qs_rnp()'s parameter's parameter, which was
> 	located by searching for "rsp".
> 
> 							Thanx, Paul
> 
> ------------------------------------------------------------------------
> 
>  Documentation/RCU/Design/Data-Structures/Data-Structures.html |   23 
>  kernel/rcu/rcu.h                                              |   28 
>  kernel/rcu/srcutree.c                                         |    4 
>  kernel/rcu/tree.c                                             | 1261 ++++------
>  kernel/rcu/tree.h                                             |   29 
>  kernel/rcu/tree_exp.h                                         |  209 -
>  kernel/rcu/tree_plugin.h                                      |  203 -
>  7 files changed, 784 insertions(+), 973 deletions(-)