On 15/05/24 14:53, Frederic Weisbecker wrote: > Reviewing Valentin's patchset made me stare at some memory barriers > on the way. Sorry not sorry? :-) > Here is some removal proposal. Some may be beneficial on > runtime (fqs snapshot with potentially as many smp_mb() as the number > of online CPUs for each GP). Some happen on more rare path. In any > case they clarify code reviews so we don't stumble upon mysterious > barriers. > > Thanks. > > Frederic Weisbecker (6): > rcu: Remove full ordering on second EQS snapshot > rcu: Remove superfluous full memory barrier upon first EQS snapshot > rcu/exp: Remove superfluous full memory barrier upon first EQS > snapshot > rcu: Remove full memory barrier on boot time eqs sanity check > rcu: Remove full memory barrier on RCU stall printout > rcu/exp: Remove redundant full memory barrier at the end of GP > > .../Tree-RCU-Memory-Ordering.rst | 6 +++--- > kernel/rcu/tree.c | 21 +++++++------------ > kernel/rcu/tree_exp.h | 16 +++++++++++--- > kernel/rcu/tree_stall.h | 4 ++-- > 4 files changed, 26 insertions(+), 21 deletions(-) > > -- > 2.44.0
