linux-kernel - Re: [PATCH 08/11] module: Fix nested sleep

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Message-ID: <20140929221823.GC12112@redhat.com>
Date:	Tue, 30 Sep 2014 00:18:23 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...nel.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, ilya.dryomov@...tank.com,
	umgwanakikbuti@...il.com, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [PATCH 08/11] module: Fix nested sleep

On 09/24, Peter Zijlstra wrote:
>
> A genuine bug, we cannot use blocking primitives inside a wait loop.
>
> So rewrite the wait_event_interruptible() usage to use the fresh
> wait_woken() stuff.

OK, but ...

> +static int wait_finished_loading(struct module *mod)
> +{
> +	DEFINE_WAIT_FUNC(wait, woken_wake_function);
> +	int ret = 0;
> +
> +	add_wait_queue(&module_wq, &wait);
> +	for (;;) {
> +		if (finished_loading(mod->name))
> +			break;
> +
> +		if (signal_pending_state(TASK_INTERRUPTIBLE, current)) {

I am puzzled by this line, why not

		if (signal_pending(current)) {

?

this should be 100% equivalent.

Oleg.

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