From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Andrew Morton <akpm@linux-foundation.org>,
maple-tree@lists.infradead.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
linux-renesas-soc@vger.kernel.org,
Shanker Donthineni <sdonthineni@nvidia.com>
Subject: Re: [PATCH v2 1/2] maple_tree: Disable mas_wr_append() when other readers are possible
Date: Tue, 12 Sep 2023 10:17:32 -0400 [thread overview]
Message-ID: <20230912141732.k5l37d4xeiwssaln@revolver> (raw)
In-Reply-To: <ZQBxPmVmBJ7J+b4B@casper.infradead.org>
* Matthew Wilcox <willy@infradead.org> [230912 10:10]:
> On Mon, Sep 11, 2023 at 07:54:52PM -0400, Liam R. Howlett wrote:
> > Taking the mutex lock in kernel/irq/manage.c __setup_irq() is calling a
> > cond_resched().
> >
> > >From what Michael said [1] in this thread, since something has already
> > set TIF_NEED_RESCHED, it will eventually enable interrupts on us.
> >
> > I've traced this to running call_rcu() in kernel/rcu/tiny.c and
> > is_idle_task(current) is true, which means rcu runs:
> > /* force scheduling for rcu_qs() */
> > resched_cpu(0);
> >
> > the task is set idle in sched_init() -> init_idle() and never changed,
> > afaict.
>
> Should calling init_idle() be deferred until after interrupts are
> all set up?
At this point it is not platform specific code so I don't know what kind
of fallout I'll produce with a change like that, but I was wondering if
the thread running the boot process is really 'idle'?
next prev parent reply other threads:[~2023-09-12 14:17 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-19 0:43 [PATCH v2 0/2] maple_tree: mas_wr_append() fix ups Liam R. Howlett
2023-08-19 0:43 ` [PATCH v2 1/2] maple_tree: Disable mas_wr_append() when other readers are possible Liam R. Howlett
2023-08-29 16:42 ` Geert Uytterhoeven
2023-08-31 5:39 ` Michael Ellerman
2023-08-31 8:25 ` Geert Uytterhoeven
2023-08-31 8:45 ` Peng Zhang
2023-08-31 9:43 ` Geert Uytterhoeven
2023-09-06 15:23 ` Liam R. Howlett
2023-09-06 17:23 ` Paul E. McKenney
2023-09-06 17:29 ` Liam R. Howlett
2023-09-06 18:02 ` Paul E. McKenney
2023-09-11 23:54 ` Liam R. Howlett
2023-09-12 8:14 ` Paul E. McKenney
2023-09-12 8:23 ` Geert Uytterhoeven
2023-09-12 8:30 ` Paul E. McKenney
2023-09-12 8:34 ` Geert Uytterhoeven
2023-09-12 10:00 ` Paul E. McKenney
2023-09-12 13:56 ` Liam R. Howlett
2023-09-12 14:29 ` Liam R. Howlett
2023-09-12 15:08 ` Paul E. McKenney
2023-09-12 15:27 ` Christophe Leroy
2023-09-12 15:49 ` Liam R. Howlett
2023-09-12 15:07 ` Paul E. McKenney
2023-09-12 15:44 ` Liam R. Howlett
2023-09-12 16:49 ` Paul E. McKenney
2023-09-12 17:02 ` Christophe Leroy
2023-09-12 17:09 ` Christophe Leroy
2023-09-12 17:38 ` Liam R. Howlett
2023-09-13 13:14 ` Geert Uytterhoeven
2023-09-13 13:24 ` Liam R. Howlett
2023-09-13 13:26 ` Geert Uytterhoeven
2023-09-12 14:37 ` Christophe Leroy
2023-09-12 14:10 ` Matthew Wilcox
2023-09-12 14:17 ` Liam R. Howlett [this message]
2023-09-06 19:06 ` Geert Uytterhoeven
2023-09-11 12:27 ` Linux regression tracking #adding (Thorsten Leemhuis)
2023-10-16 8:29 ` Linux regression tracking #update (Thorsten Leemhuis)
2023-08-30 19:49 ` Andreas Schwab
2023-08-31 5:37 ` Michael Ellerman
2023-08-31 19:01 ` Andreas Schwab
2023-09-12 18:15 ` Andreas Schwab
2023-09-12 19:09 ` Liam R. Howlett
2023-09-12 20:01 ` Andreas Schwab
2023-08-19 0:43 ` [PATCH v2 2/2] maple_tree: Clean up mas_wr_append() Liam R. Howlett
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