linux-kernel - Re: [PATCH] Double check memmap is actually valid with a memmap has unexpected holes

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Date:	Fri, 15 May 2009 02:02:11 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Mel Gorman <mel@....ul.ie>, akpm@...ux-foundation.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	hartleys@...ionengravers.com, mcrapet@...il.com,
	linux@....linux.org.uk, fred99@...olina.rr.com,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Badari Pulavarty <pbadari@...ibm.com>,
	Yasunori Goto <y-goto@...fujitsu.com>
Subject: Re: [PATCH] Double check memmap is actually valid with a memmap has unexpected holes

On Wed, May 06, 2009 at 05:50:43PM +0200, Johannes Weiner wrote:
> On Wed, May 06, 2009 at 03:31:00PM +0100, Mel Gorman wrote:
> > As it turns out, ARM has its own show_mem(). I don't see how, but ARM
> > must not be using lib/show_mem.c even though it compiles it.
> 
> It's some linker magic for lib/.  It compiles both but treats the
> library version as weak symbol (or something).
> 
This is true for lib-y handling in general, which lib/show_mem.o falls
under. Much of lib/ is obj-y though due to the fact that EXPORT_SYMBOL's
from lib-y are ineffective (people seem to get bitten by this at least
once a week), as a result, many things that start out as lib-y are
gradually moved over to obj-y, meaning that __weak annotations in obj-y
objects start to take precedent over lib-y magic anyways.. :-)
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