linux-kernel - Re: [Bugme-new] [Bug 8957] New: Exported functions and variables

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Message-ID: <20070830095622.28504717@laptopd505.fenrus.org>
Date:	Thu, 30 Aug 2007 09:56:22 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Matti Linnanvuori <mattilinnanvuori@...oo.com>
Cc:	linux-kernel@...r.kernel.org, bugme-daemon@...nel-bugs.osdl.org
Subject: Re: [Bugme-new] [Bug 8957] New: Exported functions and variables

On Thu, 30 Aug 2007 09:41:41 -0700 (PDT)
Matti Linnanvuori <mattilinnanvuori@...oo.com> wrote:

> I thought that the bug might happen when two kernel modules are being
> loaded. If module A is loaded and its code includes references to
> functions exported by module B, I thought module A could call those
> functions before the module_init function of module B has finished. I
> was not thinking about buggy calls to registering interface
> functions. I just thought that the kernel should not allow symbols
> exported by   EXPORT_SYMBOLto be visible to other modules before the
> module_init function is finished. One could code the exported
> functions so that they could be safely called by anyone while the
> module_init function is being called but that would be an unnecessary
> burden for coders. I think that a module should expose its functions
> and variables only by calling registering interface  functions before
> the module_init function is finished. So I think the design of the
> kernel modules is flawed if it allows anyone to call exported
> functions before the module_init function is finished.
> 

have you seen this?
module loading is pretty much serialized, so that no 2 modules are
being loaded in parallel...
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