linux-kernel - Re: [PATCH v3 00/10] BKL conversion in tty layer

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Message-ID: <AANLkTimO08zZV4DenxT0wi3eWp1BngGu14x0GWRyfgO5@mail.gmail.com>
Date:	Thu, 17 Jun 2010 12:13:52 -0700
From:	Tony Luck <tony.luck@...el.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	Greg KH <gregkh@...e.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Kacur <jkacur@...hat.com>,
	Al Viro <viro@...iv.linux.org.uk>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH v3 00/10] BKL conversion in tty layer

On Mon, May 17, 2010 at 6:41 AM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> At this point I think the only way to make further progress is to
> actually push this stuff into the kernel on top of the BKL removal
> patches for the drivers and see what happens. Something will no doubt
> break but we can try and nail them in time or if not revert the series
> and try again next kernel.

These changes showed up in linux-next (tag: next-20100617) ... and I'm seeing
a few WARN_ON messages on ia64 while booting:

WARNING: at include/linux/tty.h:589 tty_open+0x160/0xc60()
WARNING: at include/linux/tty.h:589 tty_open+0x9d0/0xc60()
WARNING: at include/linux/tty.h:589 tty_release+0x90/0xbc0()
WARNING: at include/linux/tty.h:589 tty_release+0x630/0xbc0()
WARNING: at include/linux/tty.h:589 tty_release+0x90/0xbc0()
WARNING: at include/linux/tty.h:589 tty_release+0x630/0xbc0()
WARNING: at include/linux/tty.h:589 tty_release+0x90/0xbc0()
WARNING: at include/linux/tty.h:589 tty_release+0x630/0xbc0()

Stack trace for the first of these looks like:
Call Trace:
 [<a0000001000159d0>] show_stack+0x50/0xa0
 [<a00000010090f250>] dump_stack+0x30/0x50
 [<a00000010008e2c0>] warn_slowpath_common+0xc0/0x120
 [<a00000010008e360>] warn_slowpath_null+0x40/0x60
 [<a00000010053ebe0>] tty_open+0x160/0xc60
 [<a0000001001af9b0>] chrdev_open+0x310/0x360
 [<a0000001001a58b0>] __dentry_open+0x350/0x680
 [<a0000001001a5d80>] nameidata_to_filp+0x80/0xc0
 [<a0000001001bfee0>] finish_open+0x160/0x380
 [<a0000001001c0cc0>] do_last+0xbc0/0xce0
 [<a0000001001c5270>] do_filp_open+0x2f0/0xb40
 [<a0000001001a5290>] do_sys_open+0x90/0x200
 [<a0000001001a54d0>] sys_open+0x50/0x80
 [<a000000100b907e0>] kernel_init+0x340/0x420
 [<a000000100013c10>] kernel_thread_helper+0x30/0x60
 [<a00000010000a0c0>] start_kernel_thread+0x20/0x40

Does anyone see anything similar on other architectures?  Or is ia64 doing
something "special" here?

-Tony
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