From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: David Howells <dhowells@redhat.com>,
Will Deacon <will.deacon@arm.com>,
linux-kernel@vger.kernel.org, mingo@kernel.org,
torvalds@linux-foundation.org, mark.rutland@arm.com,
linux-arch@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
Alexander Kuleshov <kuleshovmail@gmail.com>,
dvyukov@google.com
Subject: Re: [PATCH RFC tip/core/rcu 12/15] lib/assoc_array: Remove smp_read_barrier_depends()
Date: Wed, 11 Oct 2017 10:14:37 -0700 [thread overview]
Message-ID: <20171011171437.GA17681@linux.vnet.ibm.com> (raw)
In-Reply-To: <20171011170631.GN3521@linux.vnet.ibm.com>
On Wed, Oct 11, 2017 at 10:06:31AM -0700, Paul E. McKenney wrote:
> On Wed, Oct 11, 2017 at 06:54:05PM +0200, Peter Zijlstra wrote:
> > On Wed, Oct 11, 2017 at 09:47:48AM -0700, Paul E. McKenney wrote:
> > > Interesting. Do we currently have any dependencies headed by
> > > this_cpu_read()?
> >
> > Nope, but almost, look for: cpufreq_update_util_data.
>
> This, you mean?
>
> data = rcu_dereference_sched(*this_cpu_ptr(&cpufreq_update_util_data));
>
> True, a non-RCU dependency use case would want to use ACCESS_ONCE()
> in the new regime.
Right... s/ACCESS_ONCE()/READ_ONCE()/
Thanx, Paul
next prev parent reply other threads:[~2017-10-11 17:14 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-10 0:19 [PATCH RFC tip/core/rcu 0/15] Remove to-be-unneeded smp_read_barrier_depends() Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 01/15] doc: READ_ONCE() now implies smp_barrier_depends() Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 02/15] mn10300: READ_ONCE() now implies smp_read_barrier_depends() Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 03/15] drivers/net/ethernet/qlogic/qed: Fix __qed_spq_block() ordering Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 04/15] fs/dcache: Use release-acquire for name/length update Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 05/15] percpu: READ_ONCE() now implies smp_read_barrier_depends() Paul E. McKenney
2017-10-10 14:08 ` Tejun Heo
2017-10-10 15:30 ` Paul E. McKenney
2017-10-10 15:49 ` Tejun Heo
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 06/15] rcu: Adjust read-side accessor comments for READ_ONCE() Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 07/15] rtnetlink: Update now-misleading smp_read_barrier_depends() comment Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 08/15] seqlock: Remove now-redundant smp_read_barrier_depends() Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 09/15] uprobes: " Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 10/15] locking: Remove smp_read_barrier_depends() from queued_spin_lock_slowpath() Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 11/15] tracepoint: Remove smp_read_barrier_depends() from comment Paul E. McKenney
2017-10-10 0:31 ` Steven Rostedt
2017-10-10 1:12 ` Mathieu Desnoyers
2017-10-10 15:32 ` Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 12/15] lib/assoc_array: Remove smp_read_barrier_depends() Paul E. McKenney
2017-10-10 8:39 ` Peter Zijlstra
2017-10-10 9:36 ` David Howells
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 13/15] mm/ksm: Remove now-redundant smp_read_barrier_depends() Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 14/15] netfilter: " Paul E. McKenney
2017-10-10 8:43 ` Peter Zijlstra
2017-10-10 15:56 ` Paul E. McKenney
2017-10-10 0:22 ` [PATCH RFC tip/core/rcu 15/15] keyring: " Paul E. McKenney
2017-10-10 9:35 ` [PATCH RFC tip/core/rcu 12/15] lib/assoc_array: Remove smp_read_barrier_depends() David Howells
2017-10-10 15:50 ` Paul E. McKenney
2017-10-10 15:54 ` Peter Zijlstra
2017-10-10 16:05 ` Paul E. McKenney
2017-10-11 12:19 ` David Howells
2017-10-11 12:22 ` Will Deacon
2017-10-11 12:54 ` Paul E. McKenney
2017-10-11 14:18 ` Will Deacon
2017-10-11 14:50 ` Paul E. McKenney
2017-10-11 12:58 ` Paul E. McKenney
2017-10-11 15:17 ` David Howells
2017-10-11 15:59 ` Paul E. McKenney
2017-10-11 16:12 ` Peter Zijlstra
2017-10-11 16:24 ` Peter Zijlstra
2017-10-11 16:47 ` Paul E. McKenney
2017-10-11 16:54 ` Peter Zijlstra
2017-10-11 17:06 ` Paul E. McKenney
2017-10-11 17:11 ` Peter Zijlstra
2017-10-11 17:34 ` Paul E. McKenney
2017-10-11 18:43 ` Dmitry Vyukov
2017-10-11 18:56 ` Linus Torvalds
2017-10-11 19:28 ` Paul E. McKenney
2017-10-11 19:59 ` Dmitry Vyukov
2017-10-11 17:14 ` Paul E. McKenney [this message]
2017-10-11 17:19 ` Mark Rutland
2017-10-11 16:50 ` Paul E. McKenney
2017-10-11 16:07 ` David Howells
2017-10-11 16:17 ` Peter Zijlstra
2017-10-11 16:19 ` Paul E. McKenney
2017-10-11 15:28 ` David Howells
2017-10-11 16:02 ` Paul E. McKenney
2017-10-10 9:59 ` David Howells
2017-10-10 15:52 ` Paul E. McKenney
2017-10-11 12:21 ` [PATCH RFC tip/core/rcu 0/15] Remove to-be-unneeded smp_read_barrier_depends() David Howells
2017-10-11 12:56 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171011171437.GA17681@linux.vnet.ibm.com \
--to=paulmck@linux.vnet.ibm.com \
--cc=corbet@lwn.net \
--cc=dhowells@redhat.com \
--cc=dvyukov@google.com \
--cc=kuleshovmail@gmail.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=torvalds@linux-foundation.org \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).