linux-kernel - Regression: patch " hvc_console: display printk messages on console." causing infinite loop with 3.2-rc0 + Xen.

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Date:	Thu, 27 Oct 2011 01:30:08 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	miche@...gle.com, gregkh@...e.de, linux-kernel@...r.kernel.org
Cc:	xen-devel@...ts.xensource.com
Subject: Regression: patch " hvc_console: display printk messages on
 console." causing infinite loop with 3.2-rc0 + Xen.

Hey Miche.

The git commit 361162459f62dc0826b82c9690a741a940f457f0:

    hvc_console: display printk messages on console.

is causing an infinite loop when booting Linux under Xen, as so:

[    2.382984] console [hvc0] enabled
[    2.382984] console [hvc0] enabled
[    2.382984] console [hvc0] enabled
[    2.382984] console [hvc0] enabled
[    2.382984] console [hvc0] enabled
[    2.382984] console [hvc0] enabled
.. 

(see attached file titled bad.log)

If I use Linus's latest git tree and revert your patch I get the kernel
to bootup (see good.log file),

View attachment "bad.log" of type "text/plain" (41152 bytes)

View attachment "good.log" of type "text/plain" (92200 bytes)