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

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Date:	Mon, 7 Mar 2016 10:04:21 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Jiri Kosina <jikos@...nel.org>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	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>,
	USB list <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 Mon, Mar 7, 2016 at 9:30 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
> On Mon, 7 Mar 2016 18:24:12 +0100 (CET)
> Jiri Kosina <jikos@...nel.org> wrote:
>
>> > So, if Clang is producing wrong X86 code here, is it possible to turn
>> > interrupts on/off manually? But, hmm that affects other places as well
>> > in the Linux sources, so.
>>
>> This issue needs to be handled in the compiler.
>>
>
> Exactly. The compiler may get away with this in userspace (maybe), but
> for the kernel, it is definitely a show stopper. Especially if it knows
> that an asm() may be called.

It's broken for user code that fiddles with AC, too.

--Andy