linux-kernel - Re: [RFC 06/23] mm/memblock: Add memblock early memory allocation apis

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Message-ID: <20131013184212.GA18075@htj.dyndns.org>
Date:	Sun, 13 Oct 2013 14:42:12 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Santosh Shilimkar <santosh.shilimkar@...com>,
	grygorii.strashko@...com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	yinghai@...nel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC 06/23] mm/memblock: Add memblock early memory allocation
 apis

On Sun, Oct 13, 2013 at 07:00:59PM +0100, Russell King - ARM Linux wrote:
> On Sun, Oct 13, 2013 at 01:56:48PM -0400, Tejun Heo wrote:
> > Hello,
> > 
> > On Sat, Oct 12, 2013 at 05:58:49PM -0400, Santosh Shilimkar wrote:
> > > Introduce memblock early memory allocation APIs which allow to support
> > > LPAE extension on 32 bits archs. More over, this is the next step
> > 
> > LPAE isn't something people outside arm circle would understand.
> > Let's stick to highmem.
> 
> LPAE != highmem.  Two totally different things, unless you believe
> system memory always starts at physical address zero, which is very
> far from the case on the majority of ARM platforms.
> 
> So replacing LPAE with "highmem" is pure misrepresentation and is
> inaccurate.  PAE might be a better term, and is also the x86 term
> for this.

Ah, right, forgot about the base address.  Let's please spell out the
requirements then.  Briefly explaining both aspects (non-zero base
addr & highmem) and why the existing bootmem based interfaced can't
serve them would be helpful to later readers.

Thanks.

-- 
tejun
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