linux-kernel - Re: [PATCH] xen/evtchn: Change irq_info lock to raw_spinlock

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Message-ID: <20210407130025.tfe6aszjyjzz6ar2@liuwe-devbox-debian-v2>
Date:   Wed, 7 Apr 2021 13:00:25 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Luca Fancellu <luca.fancellu@....com>
Cc:     sstabellini@...nel.org, jgross@...e.com, jgrall@...zon.com,
        boris.ostrovsky@...cle.com, tglx@...utronix.de, wei.liu@...nel.org,
        jbeulich@...e.com, yyankovskyi@...il.com,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, bertrand.marquis@....com
Subject: Re: [PATCH] xen/evtchn: Change irq_info lock to raw_spinlock_t

On Tue, Apr 06, 2021 at 11:51:04AM +0100, Luca Fancellu wrote:
> Unmask operation must be called with interrupt disabled,
> on preempt_rt spin_lock_irqsave/spin_unlock_irqrestore
> don't disable/enable interrupts, so use raw_* implementation
> and change lock variable in struct irq_info from spinlock_t
> to raw_spinlock_t
> 
> Cc: stable@...r.kernel.org
> Fixes: 25da4618af24 ("xen/events: don't unmask an event channel
> when an eoi is pending")
> 
> Signed-off-by: Luca Fancellu <luca.fancellu@....com>

Reviewed-by: Wei Liu <wei.liu@...nel.org>