linux-kernel - Re: [PATCH 7/9] v3 Define memory_block_size

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Message-ID: <1286129461.9970.1.camel@nimitz>
Date:	Sun, 03 Oct 2010 11:11:01 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Robin Holt <holt@....com>
Cc:	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Nathan Fontenot <nfont@...tin.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...ts.ozlabs.org, Greg KH <greg@...ah.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	steiner@....com
Subject: Re: [PATCH 7/9] v3 Define memory_block_size_bytes for
 powerpc/pseries

On Sun, 2010-10-03 at 13:07 -0500, Robin Holt wrote:
> On Sun, Oct 03, 2010 at 11:25:00PM +0530, Balbir Singh wrote:
> > * Nathan Fontenot <nfont@...tin.ibm.com> [2010-10-01 13:35:54]:
> > 
> > > Define a version of memory_block_size_bytes() for powerpc/pseries such that
> > > a memory block spans an entire lmb.
> > 
> > I hope I am not missing anything obvious, but why not just call it
> > lmb_size, why do we need memblock_size?
> > 
> > Is lmb_size == memblock_size after your changes true for all
> > platforms?
> 
> What is an lmb?  I don't recall anything like lmb being referred to in
> the rest of the kernel.

Heh.  It's the OpenFirmware name for a Logical Memory Block.  Basically
what we use to determine the SECTION_SIZE on powerpc.  Probably not the
best terminology to use elsewhere in the kernel.

-- Dave

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