linux-kernel - Re: [RFC] arm: Remove sa1111 special case from mm setup code

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Message-ID: <20130616091005.GP18614@n2100.arm.linux.org.uk>
Date:	Sun, 16 Jun 2013 10:10:05 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	Nicolas Pitre <nico@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [RFC] arm: Remove sa1111 special case from mm setup code

On Sun, Jun 16, 2013 at 12:15:08AM +0100, Grant Likely wrote:
> I don't think this special case is needed anymore. From what I can tell,
> setup_dma_zone() takes care of marking the region to be reserved for
> DMA, and that happens before arm_memblock_init() which calls
> arm_mm_memblock_reserve(). Therefore the mm setup should already know
> about the reserved region and it won't need to be explicitly reserved
> and then freed. That means the special case can be dropped from the
> common code.

No it doesn't.  setup_dma_zone is all about setting the high watermark
for GFP_DMA allocations.  It has nothing to do with _temoprarily_
reserving the low 1MB, ensuring that no other user can use any of that
precious SA1111 memory during the kernel boot.
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