linux-kernel - Re: [PATCH] thermal: rcar: replace spin_lock_irqsave by spin

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Message-ID: <72412b5a-fd9a-a23e-aaf8-1a7b6eaa16c5@linaro.org>
Date:   Tue, 27 Oct 2020 10:45:56 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Tian Tao <tiantao6@...ilicon.com>, niklas.soderlund@...natech.se,
        rui.zhang@...el.com, amitk@...nel.org,
        linux-renesas-soc@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] thermal: rcar: replace spin_lock_irqsave by spin_lock in
 hard IRQ

On 27/10/2020 02:06, Tian Tao wrote:
> On RT or even on mainline with 'threadirqs' on the command line all
> interrupts which are not explicitly requested with IRQF_NO_THREAD
> run their handlers in thread context. The same applies to soft interrupts.
> That means they are subject to the normal scheduler rules and no other
> code is going to acquire that lock from hard interrupt context either,
> so the irqsave() here is pointless in all cases.
> 
> Signed-off-by: Tian Tao <tiantao6@...ilicon.com>

Applied, thanks


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