linux-kernel - Re: [REGRESSION] 2eca40a8 breaks StrongARM compilation

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Date:	Wed, 11 Nov 2009 19:32:57 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Dmitry Artamonow <mad_soft@...ox.ru>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] 2eca40a8 breaks StrongARM compilation

On Wed, Nov 11, 2009 at 10:23:15PM +0300, Dmitry Artamonow wrote:
> Commit 2eca40a8 which went into 2.6.32-rc6 breaks compilation
> for ipaq h3600 and probably other SA1100 machines when CONFIG_CPU_FREQ
> is unset:

I'm aware, I have a very large patch which fixes SA1100, but there's
other ARM machine classes which are similarly broken.

We've been around this loop before, where a change like this was
introduced and reverted.  The kernel community seems set to constantly
repeat the same old mistakes time and time again.

> +#ifdef CONFIG_CPU_FREQ
>  	pcd = get_pcd(var->pixclock, cpufreq_get(0));
> +#else
> +	pcd = get_pcd(var->pixclock, 206400);
> +#endif

This is just not acceptable, and could lead to LCD panel damage due
to wrong timings - not all platforms boot at 206.4MHz.  Given that
it's far better that the kernel be obviously broken than silently
wrong while causing hardware damage.

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