linux-kernel - Re: [PATCH 2/3] msm: add minimal board file for HTC Dream device

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Date:	Mon, 16 Nov 2009 16:36:59 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Pavel Machek <pavel@....cz>
Cc:	Arve Hj?nnev?g <arve@...roid.com>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Brian Swetland <swetland@...gle.com>
Subject: Re: [PATCH 2/3] msm: add minimal board file for HTC Dream device

On Mon, Nov 02, 2009 at 11:49:49AM +0100, Pavel Machek wrote:
> +MACHINE_START(TROUT, "HTC Dream")
> +#ifdef CONFIG_MSM_DEBUG_UART
> +	.phys_io	= MSM_DEBUG_UART_PHYS,
> +	.io_pg_offst	= ((MSM_DEBUG_UART_BASE) >> 18) & 0xfffc,
> +#endif

Why is this ifdef'd?  Two reasons why not to do this:

1. MSM_DEBUG_UART is always defined, so the conditional is pointless

2. the low level page table building code does not expect these to be
   unset (or even set to an invalid value).  Leaving them unset and
   having DEBUG_LL enabled is a recipe to prevent booting.

To put it another way, these two fields aren't optional.
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