linux-kernel - Re: [PATCH] softirq: remove parameter from action callback

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Message-ID: <0f19dd9a-e2fd-4221-aaf5-bafc516f9c32@kernel.dk>
Date: Wed, 14 Aug 2024 08:00:19 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Caleb Sander Mateos <csander@...estorage.com>,
 "Paul E. McKenney" <paulmck@...nel.org>,
 Frederic Weisbecker <frederic@...nel.org>,
 Neeraj Upadhyay <neeraj.upadhyay@...nel.org>,
 Joel Fernandes <joel@...lfernandes.org>,
 Josh Triplett <josh@...htriplett.org>, Boqun Feng <boqun.feng@...il.com>,
 Uladzislau Rezki <urezki@...il.com>, Steven Rostedt <rostedt@...dmis.org>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Lai Jiangshan <jiangshanlai@...il.com>, Zqiang <qiang.zhang1211@...il.com>,
 Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>, Ben Segall
 <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
 Valentin Schneider <vschneid@...hat.com>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Thomas Gleixner <tglx@...utronix.de>,
 Andrew Morton <akpm@...ux-foundation.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
 rcu@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] softirq: remove parameter from action callback

On 8/13/24 5:31 PM, Caleb Sander Mateos wrote:
> When softirq actions are called, they are passed a pointer to the
> entry in the softirq_vec table containing the action's function pointer.
> This pointer isn't very useful, as the action callback already knows
> what function it is. And since each callback handles a specific softirq,
> the callback also knows which softirq number is running.
> 
> No softirq action callbacks actually use this parameter,
> so remove it from the function pointer signature.
> This clarifies that softirq actions are global routines
> and makes it slightly cheaper to call them.

Commit message should use ~72 char line lengths, but outside of that:

Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe