linux-kernel - Re: [PATCH] softirq: Reserve a bit in tasklet.state for the user

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Message-ID: <20170123161023.GI6500@twins.programming.kicks-ass.net>
Date:   Mon, 23 Jan 2017 17:10:23 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Hannes Reinecke <hare@...e.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Chen Fan <chen.fan.fnst@...fujitsu.com>,
        Alexander Potapenko <glider@...gle.com>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] softirq: Reserve a bit in tasklet.state for the user

On Mon, Jan 23, 2017 at 04:59:32PM +0100, Thomas Gleixner wrote:
> On Mon, 23 Jan 2017, Jens Axboe wrote:
> 
> > On 01/23/2017 08:33 AM, Chris Wilson wrote:
> > > Allow the user to communicate with the tasklet through the atomic state
> > > field by assigning a bit for their use. This can be used, for example,
> > > to differentiate between a tasklet called following an irq or from
> > > process context, where some hardware state may only be valid after the
> > > irq.

Egads, this sounds like a horrible hack. What does 'after and irq' even
mean?