linux-kernel - Re: [uml-devel] User Mode Linux still doesn't build in 2.6.23-final.

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Message-ID: <471D31B2.6060009@goop.org>
Date:	Mon, 22 Oct 2007 16:26:42 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Al Viro <viro@....linux.org.uk>,
	WANG Cong <xiyou.wangcong@...il.com>,
	Sam Ravnborg <sam@...nborg.org>, Nix <nix@...eri.org.uk>,
	Jeff Dike <jdike@...toit.com>,
	Paolo Giarrusso <p.giarrusso@...il.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, Rob Landley <rob@...dley.net>
Subject: Re: [uml-devel] User Mode Linux still doesn't build in 2.6.23-final.

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>
>   
>> Ingo Molnar wrote:
>>     
>>> we should kill it there too.
>>>
>>> the only place where we should _please_ keep those annotations are for 
>>> functions that get called from assembly code. This makes life immensely 
>>> easier for -pg (CONFIG_FUNCTION_TRACING) kernels.
>>>       
>> Should we re-add them for the function pointers in asm-x86/paravirt.h?
>>     
>
> yes, yes, yes. :-) It was a nightmare to sort it out in -rt (and still 
> is). It's also good documentation - it pinpoints functions that are 
> called from assembly.
>
>   
>> Andi argued we should remove them since x86 is unconditionally regparm 
>> now anyway - and they're pretty ugly syntactically.
>>     
>
> Sure, it doesnt make things prettier, but i didnt see any particular 
> ugliness.

One thought I had is that "fastcall" doesn't really mean the right
thing.  The speed or otherwise of the call is a side-effect, but what we
really mean is something like "regparm".  Ie, document the actual
calling convention used, rather than an effect of the calling convention.

I guess "fastcall" has enough history now.

    J
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