On Wed, Mar 27, 2019 at 12:21:12PM +0900, Masami Hiramatsu wrote: > On Tue, 26 Mar 2019 16:00:49 -0700 > "Paul E. McKenney" <paulmck@xxxxxxxxxxxxx> wrote: > > > The RCU flavors have been consolidated, so this commit replaces mentions > > of the now-obsolete synchronize_sched() function with synchronize_rcu(). > > Thank you for updating! > > Acked-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx> Applied, thank you! Thanx, Paul > > Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxx> > > Cc: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxx> > > Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@xxxxxxxxx> > > Cc: "David S. Miller" <davem@xxxxxxxxxxxxx> > > Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx> > > Cc: Jonathan Corbet <corbet@xxxxxxx> > > Cc: <linux-doc@xxxxxxxxxxxxxxx> > > --- > > Documentation/kprobes.txt | 6 +++--- > > 1 file changed, 3 insertions(+), 3 deletions(-) > > > > diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt > > index 10f4499e677c..ee60e519438a 100644 > > --- a/Documentation/kprobes.txt > > +++ b/Documentation/kprobes.txt > > @@ -243,10 +243,10 @@ Optimization > > ^^^^^^^^^^^^ > > > > The Kprobe-optimizer doesn't insert the jump instruction immediately; > > -rather, it calls synchronize_sched() for safety first, because it's > > +rather, it calls synchronize_rcu() for safety first, because it's > > possible for a CPU to be interrupted in the middle of executing the > > -optimized region [3]_. As you know, synchronize_sched() can ensure > > -that all interruptions that were active when synchronize_sched() > > +optimized region [3]_. As you know, synchronize_rcu() can ensure > > +that all interruptions that were active when synchronize_rcu() > > was called are done, but only if CONFIG_PREEMPT=n. So, this version > > of kprobe optimization supports only kernels with CONFIG_PREEMPT=n [4]_. > > > > -- > > 2.17.1 > > > > > -- > Masami Hiramatsu <mhiramat@xxxxxxxxxx> >
