linux-kernel - Re: [PATCH -next 11/27] tty: Don't release tty locks for wait queue sanity check

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Message-ID: <20141023123036.659e8478@alan.etchedpixels.co.uk>
Date:	Thu, 23 Oct 2014 12:30:36 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
	linux-serial@...r.kernel.org
Subject: Re: [PATCH -next 11/27] tty: Don't release tty locks for wait queue
 sanity check

> (and -- don't laugh -- explore why printk disables interrupts and prevents
> cpu migration while calling the console drivers. Seems ok to me...)

It disables interrupts so that the chance of the oops getting out is
maximised, it locks down some of the other bits to try and stop
interleaved oopses producing garbage when say a 16 way server goes pop and
all the cpus oops at once.

Not sure about the migration 8)

Alan
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