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

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Message-Id: <20170123153321.4245-1-chris@chris-wilson.co.uk>
Date:   Mon, 23 Jan 2017 15:33:21 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     linux-kernel@...r.kernel.org
Cc:     Chris Wilson <chris@...is-wilson.co.uk>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jens Axboe <axboe@...nel.dk>, Hannes Reinecke <hare@...e.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Chen Fan <chen.fan.fnst@...fujitsu.com>,
        Alexander Potapenko <glider@...gle.com>
Subject: [PATCH] softirq: Reserve a bit in tasklet.state for the user

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.

Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Hannes Reinecke <hare@...e.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Chen Fan <chen.fan.fnst@...fujitsu.com>
Cc: Alexander Potapenko <glider@...gle.com>
---
 include/linux/interrupt.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 53144e78a369..ab321552089b 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -542,7 +542,8 @@ struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
 enum
 {
 	TASKLET_STATE_SCHED,	/* Tasklet is scheduled for execution */
-	TASKLET_STATE_RUN	/* Tasklet is running (SMP only) */
+	TASKLET_STATE_RUN,	/* Tasklet is running (SMP only) */
+	TASKLET_STATE_USER	/* Reserved for use by the owner */
 };
 
 #ifdef CONFIG_SMP
-- 
2.11.0