linux-kernel - Re: [patch 01/28] cpu alloc: The allocator

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Message-ID: <Pine.LNX.4.64.0711151902130.322@schroedinger.engr.sgi.com>
Date:	Thu, 15 Nov 2007 19:10:15 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	David Miller <davem@...emloft.net>
cc:	corbet@....net, andi@...stfloor.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, dada1@...mosbay.com,
	schwidefsky@...ibm.com
Subject: Re: [patch 01/28] cpu alloc: The allocator

On Thu, 15 Nov 2007, David Miller wrote:

> > I have not looked at sparc32 sorry. If you simply set up a couple of 
> > configuration values in arch/sparc32/Kconfig then everything will be fine.
> 
> There is assembler code to write, which as I stated several
> times nobody is going to work on or test.

There is no assembly code required. I overdid it in the patch that I sent 
you trying to make sparc64 use large mappings like x86_64 NUMA. You really 
do not need that. Look at the IA64 and i386 configurations. There is no C 
code required. The x86_64 code only adds some special C code for the NUMA 
case.

> > All MMU platforms can use the virtual mappings. The main use of the static 
> > configuration is for embedded systems.
> 
> Someone has to implement and test VMEMMAP now on all of these
> architectures, it is becomming a requirement unlike in the sparsemem
> patches case where it was optional.
> 
> That's unreasonable.

VMEMMAP is something different from the cpu allocator. All MMU platforms 
have vmalloc support and you even suggested the use of vmalloc.
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