linux-kernel - Re: [PATCH] WIP: HACK: LPAE, BOOTMEM and NO

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Message-ID: <CAE9FiQUoVNvWmmTV2+ZkU_nMxFToTHw6QLwp_Z_EjwMzqdLwuA@mail.gmail.com>
Date:	Sat, 29 Jun 2013 13:08:13 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Tejun Heo <tj@...nel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	linux-arm-kernel@...ts.infradead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
	Sam Ravnborg <sam@...nborg.org>, linux-arch@...r.kernel.org
Subject: Re: [PATCH] WIP: HACK: LPAE, BOOTMEM and NO_BOOTMEM

On Sat, Jun 29, 2013 at 12:55 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Sat, Jun 29, 2013 at 12:29:55PM -0700, Yinghai Lu wrote:
>> >> On these SoCs which Santosh is working on, the main physical memory
>> >> mapping is above 4GB, with just a small alias below 4GB to allow the
>> >> system to boot without the MMU being on, as they may have more than
>> >> 4GB of RAM.  As I understand it, the small alias below 4GB is not
>> >> suitable for use as a "lowmem" mapping.
>>
>> is that 32bit ARM or 64bit ARM?
>
> Only 32-bit has LPAE.  Such things don't make sense on 64-bit CPUs.

32bit ARM does not support NO_BOOTMEM yet.

arch/arc/Kconfig:       select NO_BOOTMEM
arch/arm64/Kconfig:     select NO_BOOTMEM
arch/sparc/Kconfig:     select NO_BOOTMEM
arch/x86/Kconfig:config NO_BOOTMEM


so may need to
1. make 32bit ARM to use NO_BOOTMEM at first.

2 .we can add alloc_memblock as MACRO or inline for bootmem arches,

3. NO_BOOTMEM arches will have alloc_memblock in nobootmem.c

4. replace alloc_bootmem calling with alloc_memblock calling in core code.

Thanks

Yinghai
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