linux-kernel - Re: + softirq-fix-tasklet_kill-and-its-users.patch added to -mm tree

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Date:   Wed, 21 Sep 2016 17:09:43 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     ssantosh@...nel.org
Cc:     akpm@...ux-foundation.org, davem@...emloft.net,
        giovanni.cabiddu@...el.com, gregkh@...uxfoundation.org,
        herbert@...dor.apana.org.au, isdn@...ux-pingi.de, mingo@...e.hu,
        pebolle@...cali.nl, peterz@...radead.org,
        salvatore.benedetto@...el.com, tadeusz.struk@...el.com,
        tglx@...utronix.de, mm-commits@...r.kernel.org,
        linux-kernel@...r.kernel.org, sfr@...b.auug.org.au,
        linux-next@...r.kernel.org, sergey.senozhatsky@...il.com,
        sergey.senozhatsky.work@...il.com
Subject: Re: + softirq-fix-tasklet_kill-and-its-users.patch added to -mm tree

didn't look into the issue, but this thing

> > tasklet_init() == Init and Enable scheduling
[..]
> > @@ -559,7 +559,7 @@ void tasklet_init(struct tasklet_struct
> >  {
> >  	t->next = NULL;
> >  	t->state = 0;
> > -	atomic_set(&t->count, 0);
> > +	atomic_set(&t->count, 1);
			^^^^^^^^
> >  	t->func = func;
> >  	t->data = data;
> >  }

seems to be in conflict with

 #define DECLARE_TASKLET(name, func, data) \
 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(0), func, data }
						^^^^^^^

 #define DECLARE_TASKLET_DISABLED(name, func, data) \
 struct tasklet_struct name = { NULL, 0, ATOMIC_INIT(1), func, data }
						^^^^^^^


as well as with the tasklet_{disable, enable} helpers

static inline void tasklet_disable_nosync(struct tasklet_struct *t)
{
	atomic_inc(&t->count);
	smp_mb__after_atomic();
}

static inline void tasklet_disable(struct tasklet_struct *t)
{
	tasklet_disable_nosync(t);
	tasklet_unlock_wait(t);
	smp_mb();
}

static inline void tasklet_enable(struct tasklet_struct *t)
{
	smp_mb__before_atomic();
	atomic_dec(&t->count);
}

	-ss