linux-kernel - Re: [RFC] arm: Remove sa1111 special case from arm_mm_memblock

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Date:	Mon, 17 Jun 2013 23:19:53 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nicolas Pitre <nico@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC] arm: Remove sa1111 special case from arm_mm_memblock_reserve()

On Mon, Jun 17, 2013 at 9:40 AM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Mon, Jun 17, 2013 at 01:43:19AM +0100, Grant Likely wrote:
>> The machine desc structure has a hook for doing machine-specific
>> memblock code, but the SA1111 still has a platform-specific hook in the
>> generic code. This patch merely moves the needed memblock_reserve()
>> into a callback.
>
> And... the reason I left this in generic code was to avoid the problem
> which you've created by doing this change - there is at least one PXA
> platform which also can have SA1111 enabled, and by omitting this
> reservation, you will make that platform blow up at boot time because
> we will try and free the same region of RAM twice into the buddy
> allocator.
>
> It was left there because one of these currently has to stay in generic
> code, so they both need to in order to ensure that both are properly
> paired.
>
> What problem, other than a distaste for having such things in generic
> code, are you having with this?

Merely trying to clean up generic code. That's all. It was something I
noticed that would be nice to clean up. I could remove it I suppose by
adding a new machine_desc hook, but it's not worth adding another
callback for exactly one user. I'm not going to bother spending any
more time on this.

g.
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