linux-kernel - Re: [PATCH] tasklets: simplify code in tasklet_action

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Date:   Tue, 10 Aug 2021 15:12:11 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Mingzhe Yang <cainiao666999@...il.com>, peterz@...radead.org
Cc:     linux-kernel@...r.kernel.org, yuxin.wooo@...il.com,
        becausehan@...il.com, huan.xie@...e.com,
        Mingzhe Yang <cainiao666999@...il.com>
Subject: Re: [PATCH] tasklets: simplify code in tasklet_action_common()

On Fri, Apr 30 2021 at 20:25, Mingzhe Yang wrote:

> Use tasklet_is_disabled() to simplify the code in
> tasklet_action_common.

This changelog is not really helpful. Use a new function does not tell
anything. Neither does it explain why there need to be two new functions
and worse

> +static inline bool tasklet_is_enabled(struct tasklet_struct *t)
> +{
> +	smp_rmb();

why there is suddenly a new undocumented SMP barrier in the code.

> +	return !atomic_read(&t->count);
> +}
> +
> +static inline bool tasklet_is_disabled(struct tasklet_struct *t)
> +{
> +	return !tasklet_is_enabled(t);
> +}
> +

Aside of that there is no point in exposing these functions in a global
header.

Thanks,

        tglx