From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751416AbdAWQLK (ORCPT <rfc822;w@1wt.eu>);
        Mon, 23 Jan 2017 11:11:10 -0500
Received: from bombadil.infradead.org ([65.50.211.133]:53880 "EHLO
        bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1750761AbdAWQLI (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Mon, 23 Jan 2017 11:11:08 -0500
Date: Mon, 23 Jan 2017 17:10:23 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>, Chris Wilson <chris@chris-wilson.co.uk>,
        LKML <linux-kernel@vger.kernel.org>, Hannes Reinecke <hare@suse.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Chen Fan <chen.fan.fnst@cn.fujitsu.com>,
        Alexander Potapenko <glider@google.com>,
        Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH] softirq: Reserve a bit in tasklet.state for the user
Message-ID: <20170123161023.GI6500@twins.programming.kicks-ass.net>
References: <20170123153321.4245-1-chris@chris-wilson.co.uk>
 <bda87fec-55ce-4fbc-2ad4-0f67b99baa34@kernel.dk>
 <alpine.DEB.2.20.1701231657380.3836@nanos>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <alpine.DEB.2.20.1701231657380.3836@nanos>
User-Agent: Mutt/1.5.23.1 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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?