linux-kernel - Re: [stable] [PATCH] x86, setup (2.6.30-stable) fix 80x34 and 80x60 console modes

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Date:	Mon, 29 Jun 2009 23:33:42 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Greg KH <greg@...ah.com>
CC:	Marc Aurele La France <root@...berta.ca>,
	"H. Peter Anvin" <hpa@...ux.intel.com>, x86@...nel.org,
	stable@...nel.org, Research.Support@...berta.ca,
	linux-kernel@...r.kernel.org
Subject: Re: [stable] [PATCH] x86, setup (2.6.30-stable) fix 80x34 and	80x60
 console modes

Greg KH wrote:
> On Mon, Jun 29, 2009 at 06:27:40PM -0700, H. Peter Anvin wrote:
>> Marc Aurele La France wrote:
>>> As coded, most INT10 calls in video-vga.c allow the compiler to assume EAX 
>>> remains unchanged across them, which is not always the case.  This 
>>> triggers an optimisation issue that causes vga_set_vertical_end() to be 
>>> called with an incorrect number of scanlines.  Fix this by beefing up the 
>>> asm constraints on these calls.
>>>
>>> Reported-by: Marc Aurele La France <tsi@...ee86.org>
>>> Signed-off-by: Marc Aurele La France <tsi@...ee86.org>
>>> Acked-by: H. Peter Anvin <hpa@...or.com>
>> Note: this is not in upstream since upstream is not affected due to the
>> new "BIOS glovebox" subsystem.
> 
> So it is a ".30 only" type patch?  Any older kernel versions affected?
> 

Yes, all the way back to .23 or something like that.

	-hpa
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