From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
x86@kernel.org, Marc Zyngier <marc.zyngier@arm.com>,
Robert Hodaszi <Robert.Hodaszi@digi.com>
Subject: Re: [patch V2 3/6] genirq: Add optional hardware synchronization for shutdown
Date: Mon, 1 Jul 2019 16:56:28 +0200 [thread overview]
Message-ID: <20190701145628.GC3402@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190628111440.279463375@linutronix.de>
On Fri, Jun 28, 2019 at 01:11:51PM +0200, Thomas Gleixner wrote:
> But that does not catch the case where the interrupt is on flight at the
> hardware level but not yet serviced by the target CPU. That creates an
> interesing race condition:
> + * It does not check whether there is an interrupt on flight at the
> + * hardware level, but not serviced yet, as this might deadlock when
> + * called with interrupts disabled and the target CPU of the interrupt
> + * is the current CPU.
> + /*
> + * Make sure it's not being used on another CPU and if the chip
> + * supports it also make sure that there is no (not yet serviced)
> + * interrupt on flight at the hardware level.
> + */
> + __synchronize_hardirq(desc, true);
s/on flight/in flight/ ?
next prev parent reply other threads:[~2019-07-01 14:56 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-28 11:11 [patch V2 0/6] x86/irq: Cure various interrupt issues Thomas Gleixner
2019-06-28 11:11 ` [patch V2 1/6] genirq: Delay deactivation in free_irq() Thomas Gleixner
2019-07-03 8:16 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 2/6] genirq: Fix misleading synchronize_irq() documentation Thomas Gleixner
2019-07-01 14:53 ` Peter Zijlstra
2019-07-01 18:01 ` Thomas Gleixner
2019-07-01 18:23 ` Peter Zijlstra
2019-07-03 8:16 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 3/6] genirq: Add optional hardware synchronization for shutdown Thomas Gleixner
2019-07-01 8:48 ` Marc Zyngier
2019-07-01 14:56 ` Peter Zijlstra [this message]
2019-07-01 18:02 ` Thomas Gleixner
2019-07-03 8:17 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 4/6] x86/ioapic: Implement irq_get_irqchip_state() callback Thomas Gleixner
2019-07-03 8:18 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 5/6] x86/irq: Handle spurious interrupt after shutdown gracefully Thomas Gleixner
2019-07-03 8:18 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
2019-06-28 11:11 ` [patch V2 6/6] x86/irq: Seperate unused system vectors from spurious entry again Thomas Gleixner
2019-07-03 8:19 ` [tip:x86/apic] " tip-bot for Thomas Gleixner
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=20190701145628.GC3402@hirez.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=Robert.Hodaszi@digi.com \
--cc=linux-kernel@vger.kernel.org \
--cc=marc.zyngier@arm.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.