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

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Date:	Mon, 5 Aug 2013 11:47:52 -0400
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Tejun Heo <tj@...nel.org>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	<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 Monday 05 August 2013 11:38 AM, Tejun Heo wrote:
> Hello,
> 
> On Mon, Aug 05, 2013 at 11:29:46AM -0400, Santosh Shilimkar wrote:
>> So looks like I am bit confused here. The current memblock_alloc()
>> API just returns the physical address which not mapped memory.
> 
> The memory returned by memblock is mapped if the memory area being
> allocated can be mappable.  To access, the address just needs to be
> converted to va.
> 
>> Most of the bootmem users including core code expects the
>> mapped memory pointer which the code can directly operate on.
>> So the current memblock_alloc() isn't going to help. The nobootmem.c
>> has __alloc_memory_core_early() which is actually used by most of
>> the bootmem wrappers to achieve the same. So my assumption was
>> that we need an equivalent exported memblock API.
>>
>> What am I missing?
> 
> Oh, you weren't.  I was.  I thought we already had full interface
> implemented.  Yeah, it looks like we need to build something new
> around memblock / __alloc_memory_core_early().
> 
Exactly. This is what actually I referred as the new API.

Regards,
Santosh

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