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Subject: Re: [2.6 patch] make UNIX a bool
From: "James C. Georgas" <jgeorgas@rogers.com>
To: Adrian Bunk <bunk@stusta.de>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20060303151026.GQ9295@stusta.de>
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Content-Type: text/plain
Date: Fri, 03 Mar 2006 12:50:51 -0500
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On Fri, 2006-03-03 at 16:10 +0100, Adrian Bunk wrote:
> On Fri, Mar 03, 2006 at 09:48:46AM -0500, James C. Georgas wrote:
> > On Fri, 2006-03-03 at 12:46 +0100, Adrian Bunk wrote:
> > > On Thu, Mar 02, 2006 at 11:44:57PM -0500, James C. Georgas wrote:
> > > > On Thu, 2006-02-03 at 22:44 +0100, Adrian Bunk wrote:
> > > > 
> > > > > > > 
> > > > > > > We do not have to export symbols we don't want to export to modules but 
> > > > > > > needed by CONFIG_UNIX.
> > > > > > 
> > > > > > Sorry, I must just be dense, or something.
> > > > > > 
> > > > > > Is not the only difference between a modular driver and a built in
> > > > > > driver supposed to be the initialization and cleanup functions?
> > > > > > 
> > > > > > I don't see why you would have to expose any additional symbols, over
> > > > > > and above the existing required symbols, to load your module.
> > > > > 
> > > > > Every kernel symbol a module uses must be explicitely exported with 
> > > > > EXPORT_SYMBOL.
> > > > 
> > > > Yes, I understand that I need to export symbols to define the interface
> > > > to my driver. whether its a module or compiled in. This is how other
> > > > systems interact with my driver, right?
> > > 
> > > EXPORT_SYMBOL is only required for modules.
> > > 
> > > > > CONFIG_UNIX uses symbols that are neither used by any other in-kernel 
> > > > > modules nor should be exported.
> > > > 
> > > > Are you saying that AF_UNIX has to export symbols for its own private
> > > > functions in order to call them? I guess I don't understand this. Why
> > > > not just call them. They're in scope within the driver code, aren't
> > > > they?
> > > 
> > > No, this is about functions defined in other parts of the kernel.
> > > 
> > 
> > Ok, if I understand you correctly now, there is a function defined in
> > another part of the kernel, which is _called_ by AF_UNIX, and it is for
> > this function that the other part of the kernel must export a symbol?
> > 
> > But you only need to do this so that modules can use the function,
> > because if, instead, the driver is built in, then the function is
> > directly in scope, and can be called explicitly?
> 
> Correct.

Ok, I understand.

What are the exported symbols, and where are they defined?

I read the post you linked to earlier, but I got nothing when I grepped
for "get_max_files", which was mentioned.
-- 
James C. Georgas <jgeorgas@rogers.com>

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