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

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Message-ID: <20101003182701.GI7896@balbir.in.ibm.com>
Date:	Sun, 3 Oct 2010 23:57:01 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	Robin Holt <holt@....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

* Dave Hansen <dave@...ux.vnet.ibm.com> [2010-10-03 11:11:01]:

> 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.

Agreed for the kernel, this patch was for powerpc/pseries, hence was
checking in this context.

-- 
	Three Cheers,
	Balbir
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