linux-kernel - Re: Compiled tridentfb hangs but distribution kernel works fine

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Message-Id: <201412120007.45242.linux@rainbow-software.org>
Date:	Fri, 12 Dec 2014 00:07:44 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	linux-fbdev@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Compiled tridentfb hangs but distribution kernel works fine

On Wednesday 10 December 2014 08:15:04 Mike Galbraith wrote:
> On Tue, 2014-12-09 at 22:33 +0100, Ondrej Zary wrote:
> > Hello,
> > I'm doing some work on tridentfb driver but encountered a weird problem.
> >
> > When I compile custom kernel with tridentfb, it hangs with Blade3D card
> > (ID 0x9880) in blade_image_blit(). The screen is blank with some
> > artifacts and machine does not respond to ping or keyboard. However, it
> > can be rebooted by Alt+SysRq+B. It works fine with other cards (3DImage
> > 9750 and CyberBlade XP) with no blit implementation. Commenting out
> > contents of blade_image_blit() function makes the hang go away (nothing
> > useful on the screen, of course).
> >
> > The weird thing is that the Blade3D card works fine when I load Debian
> > kernels! Debian 3.16-0.bpo.3-686-pae works fine but when I compile 3.16
> > kernel, it hangs.
> >
> > Any ideas?
>
> I'd start by looking for what Debian changed in source and/or config.

Seems that the problem appears only of CONFIG_CC_OPTIMIZE_FOR_SIZE is enabled. 
Really weird.

-- 
Ondrej Zary
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