linux-kernel - Re: [PATCH] slob: fix linking for user mode linux

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Message-Id: <1202769569.12383.49.camel@cinder.waste.org>
Date:	Mon, 11 Feb 2008 16:39:29 -0600
From:	Matt Mackall <mpm@...enic.com>
To:	Pekka J Enberg <penberg@...helsinki.fi>
Cc:	jdike@...toit.com, blaisorblade@...oo.it, clameter@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] slob: fix linking for user mode linux


On Tue, 2008-02-12 at 00:32 +0200, Pekka J Enberg wrote:
> From: Pekka Enberg <penberg@...helsinki.fi>
> 
> UML has some header magic that expects a non-inline __kmalloc() function to be
> available. Fixes the following link time errors:
> 
> arch/um/drivers/built-in.o: In function `kmalloc':
> /home/penberg/linux-2.6/arch/um/include/um_malloc.h:14: undefined reference to `__kmalloc'
> /home/penberg/linux-2.6/arch/um/include/um_malloc.h:14: undefined reference to `__kmalloc'
> /home/penberg/linux-2.6/arch/um/include/um_malloc.h:14: undefined reference to `__kmalloc'
> /home/penberg/linux-2.6/arch/um/include/um_malloc.h:14: undefined reference to `__kmalloc'
> /home/penberg/linux-2.6/arch/um/include/um_malloc.h:14: undefined reference to `__kmalloc'
> arch/um/drivers/built-in.o:/home/penberg/linux-2.6/arch/um/include/um_malloc.h:14: more undefined references to `__kmalloc' follow

Can someone explain why the magic is needed (and preferably capture it
in a comment somewhere sensible)? I took a peek at this and have no idea
what's going on. 

-- 
Mathematics is the supreme nostalgia of our time.

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