linux-kernel - Re: ftrace breaks sparc64 build

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Message-Id: <20090106.103944.99651976.davem@davemloft.net>
Date:	Tue, 06 Jan 2009 10:39:44 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	sam@...nborg.org
Cc:	viro@...IV.linux.org.uk, jbeulich@...ell.com, mingo@...e.hu,
	rostedt@...dmis.org, srostedt@...hat.com,
	linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org
Subject: Re: ftrace breaks sparc64 build

From: Sam Ravnborg <sam@...nborg.org>
Date: Tue, 6 Jan 2009 14:34:42 +0100

> But I never managed to really understand what the btfixup thing is all
> about and has then been sidetracked by funnier stuff.

It's recording relocations that get fixed up at boot time.

The way it works is that each btfixup emits a reference to a symbol
that will be unresolved.

The btfixup tool under arch/sparc/boot/ scans the unlinked kernel
image, generates dummy symbol definitions into a foo.s file so that
the kernel can be linked, and builds the btfixup tables so the kernel
can patch up these relocations at boot time.
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