From: Sebastian Andrzej Siewior <bigeasy@linutronix•de>
To: Vlastimil Babka <vbabka@suse•cz>
Cc: "Paul E. McKenney" <paulmck@kernel•org>,
Marco Elver <elver@google•com>,
linux-next@vger•kernel.org, linux-kernel@vger•kernel.org,
kasan-dev@googlegroups•com, linux-mm@kvack•org,
sfr@canb•auug.org.au, longman@redhat•com, boqun.feng@gmail•com,
cl@linux•com, penberg@kernel•org, rientjes@google•com,
iamjoonsoo.kim@lge•com, akpm@linux-foundation•org
Subject: Re: [BUG] -next lockdep invalid wait context
Date: Thu, 31 Oct 2024 08:55:09 +0100 [thread overview]
Message-ID: <20241031075509.hCS9Amov@linutronix.de> (raw)
In-Reply-To: <cca52eaa-28c2-4ed5-9870-b2531ec8b2bc@suse.cz>
On 2024-10-31 08:35:45 [+0100], Vlastimil Babka wrote:
> On 10/31/24 08:21, Sebastian Andrzej Siewior wrote:
> > On 2024-10-30 16:10:58 [-0700], Paul E. McKenney wrote:
> >>
> >> So I need to avoid calling kfree() within an smp_call_function() handler?
> >
> > Yes. No kmalloc()/ kfree() in IRQ context.
>
> However, isn't this the case that the rule is actually about hardirq context
> on RT, and most of these operations that are in IRQ context on !RT become
> the threaded interrupt context on RT, so they are actually fine? Or is smp
> call callback a hardirq context on RT and thus it really can't do those
> operations?
interrupt handlers as of request_irq() are forced-threaded on RT so you
can do kmalloc()/ kfree() there. smp_call_function.*() on the other hand
are not threaded and invoked directly within the IRQ context.
> Vlastimil
>
Sebastian
next prev parent reply other threads:[~2024-10-31 7:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-30 21:05 [BUG] -next lockdep invalid wait context Paul E. McKenney
2024-10-30 21:48 ` Vlastimil Babka
2024-10-30 22:34 ` Marco Elver
2024-10-30 23:04 ` Boqun Feng
2024-10-30 23:10 ` Paul E. McKenney
2024-10-31 7:21 ` Sebastian Andrzej Siewior
2024-10-31 7:35 ` Vlastimil Babka
2024-10-31 7:55 ` Sebastian Andrzej Siewior [this message]
2024-10-31 8:18 ` Vlastimil Babka
2024-11-01 17:14 ` Paul E. McKenney
2024-10-31 17:50 ` Paul E. McKenney
2024-11-01 19:50 ` Boqun Feng
2024-11-01 19:54 ` [PATCH] scftorture: Use workqueue to free scf_check Boqun Feng
2024-11-01 23:35 ` Paul E. McKenney
2024-11-03 3:35 ` Boqun Feng
2024-11-03 15:03 ` Paul E. McKenney
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