linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Peter Zijlstra <peterz@infradead.org>
To: Frederic Weisbecker <frederic@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>, Phil Auld <pauld@redhat.com>,
	Alex Belits <abelits@marvell.com>,
	Nicolas Saenz Julienne <nsaenz@kernel.org>,
	Xiongfeng Wang <wangxiongfeng2@huawei.com>,
	Neeraj Upadhyay <quic_neeraju@quicinc.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Yu Liao <liaoyu15@huawei.com>, Boqun Feng <boqun.feng@gmail.com>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Paul Gortmaker <paul.gortmaker@windriver.com>,
	Uladzislau Rezki <uladzislau.rezki@sony.com>,
	Joel Fernandes <joel@joelfernandes.org>
Subject: Re: [PATCH 03/21] rcu: Add a note about noinstr VS unsafe eqs functions
Date: Thu, 19 May 2022 23:43:03 +0200	[thread overview]
Message-ID: <20220519214303.GC6479@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20220519150026.GK2578@worktop.programming.kicks-ass.net>

On Thu, May 19, 2022 at 05:00:26PM +0200, Peter Zijlstra wrote:
> On Tue, May 03, 2022 at 12:00:33PM +0200, Frederic Weisbecker wrote:
> > @@ -895,6 +899,10 @@ static void noinstr rcu_eqs_exit(bool user)
> >   *
> >   * If you add or remove a call to rcu_idle_exit(), be sure to test with
> >   * CONFIG_RCU_EQS_DEBUG=y.
> > + *
> > + * FIXME: This function should be noinstr but the below local_irq_save() is
> > + * unsafe because it involves illegal RCU uses through tracing and lockdep.
> > + * This must be fixed first.
> >   */
> >  void rcu_idle_exit(void)
> >  {
> 
> Urgh, except this one... I'm sure I fixed that at some point. Clearly
> that never made it in :/

I found my patches and brushed them off, see here:

  https://lkml.kernel.org/r/20220519212750.656413111@infradead.org

  parent reply	other threads:[~2022-05-19 21:43 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-03 10:00 [PATCH 00/21] rcu/context-tracking: Merge RCU eqs-dynticks counter to context tracking v2 Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 01/21] context_tracking: Remove unused context_tracking_in_user() Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 02/21] rcu: Set rcu_idle_enter() as noinstr Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 03/21] rcu: Add a note about noinstr VS unsafe eqs functions Frederic Weisbecker
2022-05-19 14:48   ` Peter Zijlstra
2022-05-19 15:01     ` Frederic Weisbecker
2022-05-19 14:54   ` Peter Zijlstra
2022-05-19 15:26     ` Paul E. McKenney
2022-05-19 15:35       ` Frederic Weisbecker
2022-05-19 16:10         ` Paul E. McKenney
2022-05-19 15:00   ` Peter Zijlstra
2022-05-19 15:04     ` Frederic Weisbecker
2022-05-19 21:43     ` Peter Zijlstra [this message]
2022-05-03 10:00 ` [PATCH 04/21] context_tracking: Add a note about noinstr VS unsafe context tracking functions Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 05/21] context_tracking: Rename __context_tracking_enter/exit() to __ct_user_enter/exit() Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 06/21] context_tracking: Rename context_tracking_user_enter/exit() to user_enter/exit_callable() Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 07/21] context_tracking: Rename context_tracking_enter/exit() to ct_user_enter/exit() Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 08/21] context_tracking: Rename context_tracking_cpu_set() to ct_cpu_track_user() Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 09/21] context_tracking: Split user tracking Kconfig Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 10/21] context_tracking: Take idle eqs entrypoints over RCU Frederic Weisbecker
2022-05-03 11:02   ` Mark Rutland
2022-05-03 11:42     ` Frederic Weisbecker
2022-05-03 13:33       ` Mark Rutland
2022-05-03 10:00 ` [PATCH 11/21] context_tracking: Take IRQ " Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 12/21] context_tracking: Take NMI " Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 13/21] rcu/context-tracking: Remove rcu_irq_enter/exit() Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 14/21] rcu/context_tracking: Move dynticks counter to context tracking Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 15/21] rcu/context_tracking: Move dynticks_nesting " Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 16/21] rcu/context_tracking: Move dynticks_nmi_nesting " Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 17/21] rcu/context-tracking: Move deferred nocb resched " Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 18/21] rcu/context-tracking: Move RCU-dynticks internal functions to context_tracking Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 19/21] rcu/context-tracking: Remove unused and/or unecessary middle functions Frederic Weisbecker
2022-05-03 10:00 ` [PATCH 20/21] context_tracking: Convert state to atomic_t Frederic Weisbecker
2022-05-18 15:09   ` nicolas saenz julienne
2022-05-19 14:37     ` Frederic Weisbecker
2022-05-23 11:59       ` nicolas saenz julienne
2022-05-03 10:00 ` [PATCH 21/21] rcu/context_tracking: Merge dynticks counter and context tracking states Frederic Weisbecker
2022-05-18 15:31   ` nicolas saenz julienne
2022-05-19 15:06     ` Frederic Weisbecker
2022-05-18 15:33 ` [PATCH 00/21] rcu/context-tracking: Merge RCU eqs-dynticks counter to context tracking v2 Nicolas Saenz Julienne
2022-05-19 15:07   ` Frederic Weisbecker

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=20220519214303.GC6479@worktop.programming.kicks-ass.net \
    --to=peterz@infradead.org \
    --cc=abelits@marvell.com \
    --cc=boqun.feng@gmail.com \
    --cc=frederic@kernel.org \
    --cc=joel@joelfernandes.org \
    --cc=liaoyu15@huawei.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mtosatti@redhat.com \
    --cc=nsaenz@kernel.org \
    --cc=paul.gortmaker@windriver.com \
    --cc=pauld@redhat.com \
    --cc=paulmck@kernel.org \
    --cc=quic_neeraju@quicinc.com \
    --cc=tglx@linutronix.de \
    --cc=uladzislau.rezki@sony.com \
    --cc=wangxiongfeng2@huawei.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).