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

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Message-ID: <4A496A0C.809@kernel.org>
Date:	Mon, 29 Jun 2009 18:27:40 -0700
From:	"H. Peter Anvin" <hpa@...nel.org>
To:	Marc Aurele La France <root@...berta.ca>
CC:	stable@...nel.org, x86@...nel.org, linux-kernel@...r.kernel.org,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Research.Support@...berta.ca
Subject: Re: [PATCH] x86, setup (2.6.30-stable) fix 80x34 and 80x60 console
 modes

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.

	-hpa
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