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Message-ID: <20200716153704.GM12769@casper.infradead.org>
Date: Thu, 16 Jul 2020 16:37:04 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Kees Cook <keescook@...omium.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
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Subject: Re: [PATCH 3/3] tasklet: Introduce new initialization API
On Wed, Jul 15, 2020 at 08:08:47PM -0700, Kees Cook wrote:
> +#define DECLARE_TASKLET(name, _callback) \
> +struct tasklet_struct name = { \
> + .count = ATOMIC_INIT(0), \
> + .callback = _callback, \
> + .use_callback = true, \
> +}
> +
> +#define DECLARE_TASKLET_DISABLED(name, _callback) \
> +struct tasklet_struct name = { \
> + .count = ATOMIC_INIT(1), \
> + .callback = _callback, \
> +}
You forgot to set use_callback here.
> @@ -547,7 +547,10 @@ static void tasklet_action_common(struct softirq_action *a,
> if (!test_and_clear_bit(TASKLET_STATE_SCHED,
> &t->state))
> BUG();
> - t->func(t->data);
> + if (t->use_callback)
> + t->callback(t);
> + else
> + t->func(t->data);
I think this is the wrong way to do the conversion. Start out by setting
t->data to (unsigned long)t in the new initialisers. Then convert the
drivers (all 350 of them) to the new API. Then you can get rid of 'data'
from the tasklet_struct.
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