linux-kernel - Re: [Patch 1/4] Allow arch-specific cleanup before breakpoint unregistration

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Message-ID: <4250.1274867681@redhat.com>
Date:	Wed, 26 May 2010 10:54:41 +0100
From:	David Howells <dhowells@...hat.com>
To:	prasad@...ux.vnet.ibm.com
Cc:	dhowells@...hat.com, Millton Miller <miltonm@....com>,
	Michael Neuling <mikey@...ling.org>,
	Benjamin Herrenschmidt <benh@....ibm.com>,
	shaggy@...ux.vnet.ibm.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	David Gibson <dwg@....ibm.com>,
	"linuxppc-dev@...abs.org" <linuxppc-dev@...abs.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Paul Mackerras <paulus@...ba.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [Patch 1/4] Allow arch-specific cleanup before breakpoint unregistration

K.Prasad <prasad@...ux.vnet.ibm.com> wrote:

> > My understanding is weak function definitions must appear in a different C
> > file than their call sites to work on some toolchains.
> > 
> 
> Atleast, there are quite a few precedents inside the Linux kernel for
> __weak functions being invoked from the file in which they are defined
> (arch_hwblk_init, arch_enable_nonboot_cpus_begin and hw_perf_disable to
> name a few).
> Moreover the online GCC docs haven't any such constraints mentioned.

I've seen problems in this area.  gcc sometimes inlines a weak function that's
in the same file as the call point.

David
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