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Date:   Thu, 19 Nov 2020 13:18:01 +0100
From:   Frederic Weisbecker <frederic@kernel.org>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Paul McKenney <paulmck@kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Arnd Bergmann <arnd@arndb.de>,
        "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
        Helge Deller <deller@gmx.de>, linux-parisc@vger.kernel.org,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>, linux-sh@vger.kernel.org,
        Jeff Dike <jdike@addtoit.com>,
        Richard Weinberger <richard@nod.at>,
        Anton Ivanov <anton.ivanov@cambridgegreys.com>,
        linux-um@lists.infradead.org, Russell King <linux@armlinux.org.uk>,
        Marc Zyngier <maz@kernel.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        linux-arm-kernel@lists.infradead.org,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>
Subject: Re: [patch 12/19] softirq: Add RT specific softirq accounting
Message-ID: <20201119121801.GA20115@lothringen>
References: <20201113140207.499353218@linutronix.de>
 <20201113141734.096224353@linutronix.de>
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On Fri, Nov 13, 2020 at 03:02:19PM +0100, Thomas Gleixner wrote:
> RT requires the softirq to be preemptible and uses a per CPU local lock to
> protect BH disabled sections and softirq processing. Therefore RT cannot
> use the preempt counter to keep track of BH disabled/serving.
> 
> Add a RT only counter to task struct and adjust the relevant macros in
> preempt.h.

You may want to describe a bit the reason for this per task counter.
It's not intuitive at this stage.

Thanks.