linux-kernel - Re: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning

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Message-ID: <CA+icZUXW7_AMXc1x_9XjApXPMk1AL2hpech4Tr6rU3MmH516Vw@mail.gmail.com>
Date:	Wed, 2 Mar 2016 10:11:46 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Jiri Kosina <jikos@...nel.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Andy Lutomirski <luto@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning

On 3/2/16, Jiri Kosina <jikos@...nel.org> wrote:
> On Wed, 2 Mar 2016, Sedat Dilek wrote:
>>
>> static bool start_flush_work(struct work_struct *work, struct wq_barrier
>> *barr)
>> {
>>         struct worker *worker = NULL;
>>         struct worker_pool *pool;
>>         struct pool_workqueue *pwq;
>>
>>         might_sleep();
>>
>>         local_irq_disable();
>>         pool = get_work_pool(work);
>>         if (!pool) {
>>                 local_irq_enable();
>>                 return false;
>>         }
>>
>>         spin_lock(&pool->lock); <--- XXX: spin_lock_irq() ???
>
> No, this is fine. IRQs are unconditionally disabled a few lines above.
>

You are right, I tried with a substitution and that does not matter.

What about passing flags to local_irq_XXX?
And how do I do that?

- Sedat -

> --
> Jiri Kosina
> SUSE Labs
>
>