Hello!

This series removes redundant memory barriers from the grace-period
code paths:

1.	Remove full ordering on second EQS snapshot, courtesy of Frederic
	Weisbecker.

2.	Remove superfluous full memory barrier upon first EQS snapshot,
	courtesy of Frederic Weisbecker.

3.	rcu/exp: Remove superfluous full memory barrier upon first EQS
	snapshot, courtesy of Frederic Weisbecker.

4.	Remove full memory barrier on boot time eqs sanity check,
	courtesy of Frederic Weisbecker.

5.	Remove full memory barrier on RCU stall printout, courtesy of
	Frederic Weisbecker.

6.	rcu/exp: Remove redundant full memory barrier at the end of GP,
	courtesy of Frederic Weisbecker.

						Thanx, Paul

------------------------------------------------------------------------

 b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst |    6 +--
 b/kernel/rcu/tree.c                                                     |    2 -
 b/kernel/rcu/tree_exp.h                                                 |    8 +++-
 b/kernel/rcu/tree_stall.h                                               |    4 +-
 kernel/rcu/tree.c                                                       |   19 +++-------
 kernel/rcu/tree_exp.h                                                   |    8 +++-
 6 files changed, 26 insertions(+), 21 deletions(-)

On Tue, Jun 04, 2024 at 03:26:46PM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This series removes redundant memory barriers from the grace-period
> code paths:
> 
> 1.	Remove full ordering on second EQS snapshot, courtesy of Frederic
> 	Weisbecker.
> 
> 2.	Remove superfluous full memory barrier upon first EQS snapshot,
> 	courtesy of Frederic Weisbecker.
> 
> 3.	rcu/exp: Remove superfluous full memory barrier upon first EQS
> 	snapshot, courtesy of Frederic Weisbecker.
> 
> 4.	Remove full memory barrier on boot time eqs sanity check,
> 	courtesy of Frederic Weisbecker.
> 
> 5.	Remove full memory barrier on RCU stall printout, courtesy of
> 	Frederic Weisbecker.
> 
> 6.	rcu/exp: Remove redundant full memory barrier at the end of GP,
> 	courtesy of Frederic Weisbecker.
> 

Reviewed-by: Boqun Feng <boqun.feng@gmail.com>

Regards,
Boqun

> 						Thanx, Paul
> 
> ------------------------------------------------------------------------
> 
>  b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst |    6 +--
>  b/kernel/rcu/tree.c                                                     |    2 -
>  b/kernel/rcu/tree_exp.h                                                 |    8 +++-
>  b/kernel/rcu/tree_stall.h                                               |    4 +-
>  kernel/rcu/tree.c                                                       |   19 +++-------
>  kernel/rcu/tree_exp.h                                                   |    8 +++-
>  6 files changed, 26 insertions(+), 21 deletions(-)
>

On Tue, Jun 04, 2024 at 03:26:46PM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This series removes redundant memory barriers from the grace-period
> code paths:
> 
> 1.	Remove full ordering on second EQS snapshot, courtesy of Frederic
> 	Weisbecker.
> 
> 2.	Remove superfluous full memory barrier upon first EQS snapshot,
> 	courtesy of Frederic Weisbecker.
> 
> 3.	rcu/exp: Remove superfluous full memory barrier upon first EQS
> 	snapshot, courtesy of Frederic Weisbecker.
> 
> 4.	Remove full memory barrier on boot time eqs sanity check,
> 	courtesy of Frederic Weisbecker.
> 
> 5.	Remove full memory barrier on RCU stall printout, courtesy of
> 	Frederic Weisbecker.
> 
> 6.	rcu/exp: Remove redundant full memory barrier at the end of GP,
> 	courtesy of Frederic Weisbecker.
> 

Reviewed-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>

> 						Thanx, Paul
> 
> ------------------------------------------------------------------------
> 
>  b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst |    6 +--
>  b/kernel/rcu/tree.c                                                     |    2 -
>  b/kernel/rcu/tree_exp.h                                                 |    8 +++-
>  b/kernel/rcu/tree_stall.h                                               |    4 +-
>  kernel/rcu/tree.c                                                       |   19 +++-------
>  kernel/rcu/tree_exp.h                                                   |    8 +++-
>  6 files changed, 26 insertions(+), 21 deletions(-)

On Wed, Jun 12, 2024 at 03:12:07PM +0530, Neeraj Upadhyay wrote:
> On Tue, Jun 04, 2024 at 03:26:46PM -0700, Paul E. McKenney wrote:
> > Hello!
> > 
> > This series removes redundant memory barriers from the grace-period
> > code paths:
> > 
> > 1.	Remove full ordering on second EQS snapshot, courtesy of Frederic
> > 	Weisbecker.
> > 
> > 2.	Remove superfluous full memory barrier upon first EQS snapshot,
> > 	courtesy of Frederic Weisbecker.
> > 
> > 3.	rcu/exp: Remove superfluous full memory barrier upon first EQS
> > 	snapshot, courtesy of Frederic Weisbecker.
> > 
> > 4.	Remove full memory barrier on boot time eqs sanity check,
> > 	courtesy of Frederic Weisbecker.
> > 
> > 5.	Remove full memory barrier on RCU stall printout, courtesy of
> > 	Frederic Weisbecker.
> > 
> > 6.	rcu/exp: Remove redundant full memory barrier at the end of GP,
> > 	courtesy of Frederic Weisbecker.
> > 
> 
> Reviewed-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>

I will apply yours and Boqun's tag on the next rebase, thank you both!

						Thanx, Paul

> > ------------------------------------------------------------------------
> > 
> >  b/Documentation/RCU/Design/Memory-Ordering/Tree-RCU-Memory-Ordering.rst |    6 +--
> >  b/kernel/rcu/tree.c                                                     |    2 -
> >  b/kernel/rcu/tree_exp.h                                                 |    8 +++-
> >  b/kernel/rcu/tree_stall.h                                               |    4 +-
> >  kernel/rcu/tree.c                                                       |   19 +++-------
> >  kernel/rcu/tree_exp.h                                                   |    8 +++-
> >  6 files changed, 26 insertions(+), 21 deletions(-)