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

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Message-ID: <CA+icZUUQJkQGv6CdPMqwnmcrGk7nKqyYCps89g+MAkPt7Qa3nQ@mail.gmail.com>
Date:	Wed, 2 Mar 2016 16:34:28 +0100
From:	Sedat Dilek <sedat.dilek@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Jiri Kosina <jikos@...nel.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>,
	Alan Stern <stern@...land.harvard.edu>,
	Felipe Balbi <balbi@...com>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] usbhid: Fix lockdep unannotated irqs-off warning

On 3/2/16, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, Mar 02, 2016 at 04:00:49PM +0100, Sedat Dilek wrote:
>> >
>> > Right, most odd. Sedat, could you provide objdump -D of the relevant
>> > sections of vmlinux ?
>> >
>>
>> Can you give some clear instructions - for what shall I look for in
>> special?
>
> objdump -D vmlinux | awk '/<[^>]*>:$/ { p=0; } /<del_timer_sync>:/ { p=1; }
> { if (p) print $0; }'
>
> might be a good start, esp. if the output differs between the LLVM and
> GCC cases (+- address muck).
>

Done as you instructed (small-sized attachment)

Plus some oldschool-grep-ing in the 2nd attached file...

$ grep '>:' objdump-D_vmlinux_peterz.txt
180585-ffffffff8109a320 <mod_delayed_work_on>:
180643:ffffffff8109a3d0 <try_to_grab_pending>:
180873-ffffffff8109a760 <flush_workqueue>:
181267-ffffffff8109ae80 <flush_workqueue_prep_pwqs>:
181423-ffffffff8109b0e0 <drain_workqueue>:
181554-ffffffff8109b2c0 <flush_work>:
181593-ffffffff8109b340 <start_flush_work>:
181756-ffffffff8109b5d0 <cancel_work_sync>:
181772-ffffffff8109b5f0 <__cancel_work_timer>:
181932-ffffffff8109b870 <flush_delayed_work>:
181963-ffffffff8109b8d0 <cancel_delayed_work>:
182027-ffffffff8109b9a0 <set_work_pool_and_clear_pending>:
182062-ffffffff8109ba10 <cancel_delayed_work_sync>:
310375:ffffffff8110f3f0 <del_timer>:
310433-ffffffff8110f4b0 <try_to_del_timer_sync>:
310490-ffffffff8110f570 <del_timer_sync>:

Hope this helps.

- Sedat -

View attachment "objdump-D_vmlinux_peterz-instructions.txt" of type "text/plain" (4898 bytes)

View attachment "objdump-D_vmlinux_peterz.txt" of type "text/plain" (119911 bytes)