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

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Message-ID: <c31042a2-fb32-fcf0-7b81-13c53473e9ea@oracle.com>
Date:   Wed, 7 Apr 2021 17:43:55 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Luca Fancellu <luca.fancellu@....com>, sstabellini@...nel.org,
        jgross@...e.com, jgrall@...zon.com
Cc:     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 4/6/21 6:51 AM, 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>



Applied to for-linus-5.12b


-boris