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From: Blaisorblade <blaisorblade@yahoo.it>
To: Jeff Dike <jdike@addtoit.com>
Subject: Re: [uml-devel] [PATCH 8/8] uml: avoid "CONFIG_NR_CPUS undeclared" bogus error messages
Date: Fri, 20 Jan 2006 00:41:08 +0100
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Cc: linux-kernel@vger.kernel.org, user-mode-linux-devel@lists.sourceforge.net
References: <20060118235132.4626.74049.stgit@zion.home.lan> <200601191601.31805.blaisorblade@yahoo.it> <20060119194356.GA8670@ccure.user-mode-linux.org>
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On Thursday 19 January 2006 20:43, Jeff Dike wrote:
> On Thu, Jan 19, 2006 at 04:01:28PM +0100, Blaisorblade wrote:
> > Gerd Knorr in his tty patch, instead, used forward declarations, like:
> >
> > struct task_struct;
> >
> > what about that?

> I don't think so.  At least when you use void *, you are using a type
> that's not incorrect.  In userspace code, those task_structs start
> referring to host task_structs, which is definitely very wrong.

Possibly yes, but as long as we don't dereference the pointer (and in a 
prototype you're not going to do that) there's no problem.

Using a type makes the code clearer, and it doesn't hide any warning GCC may 
give (behaving well is left to us only).

In fact, btw (before I forget) we have currently the wrong errno used in 
sys-i386/ldt.c. Just wrote the fix (it's adding a silly os_ptrace_ldt). Going 
to compile and send.

> > Those functions probably should be moved anyway because they're
> > useless there

> Yeah.

> 				Jeff

-- 
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade

	

	
		
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