netdev - Re: [EXT] Re: [PATCH v5 5/9] task_isolation: Add driver-specific hooks

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Date:   Fri, 4 Dec 2020 00:43:49 +0000
From:   Alex Belits <abelits@...vell.com>
To:     "mark.rutland@....com" <mark.rutland@....com>
CC:     Prasun Kapoor <pkapoor@...vell.com>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "trix@...hat.com" <trix@...hat.com>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "nitesh@...hat.com" <nitesh@...hat.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "mtosatti@...hat.com" <mtosatti@...hat.com>,
        "will@...nel.org" <will@...nel.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "frederic@...nel.org" <frederic@...nel.org>,
        "leon@...ebranch.com" <leon@...ebranch.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "pauld@...hat.com" <pauld@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [EXT] Re: [PATCH v5 5/9] task_isolation: Add driver-specific
 hooks


On Wed, 2020-12-02 at 14:18 +0000, Mark Rutland wrote:
> External Email
> 
> -------------------------------------------------------------------
> ---
> On Mon, Nov 23, 2020 at 05:57:42PM +0000, Alex Belits wrote:
> > Some drivers don't call functions that call
> > task_isolation_kernel_enter() in interrupt handlers. Call it
> > directly.
> 
> I don't think putting this in drivers is the right approach. IIUC we
> only need to track user<->kernel transitions, and we can do that
> within
> the architectural entry code before we ever reach irqchip code. I
> suspect the current approacch is an artifact of that being difficult
> in
> the old structure of the arch code; recent rework should address
> that,
> and we can restruecture things further in future.

I agree completely. This patch only covers irqchip drivers with unusual
entry procedures.

-- 
Alex