linux-kernel - Re: kvmmmu tracing

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Message-ID: <4B0BEB00.5090703@redhat.com>
Date:	Tue, 24 Nov 2009 16:17:36 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Johannes Berg <johannes@...solutions.net>
CC:	kvm <kvm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: kvmmmu tracing

On 11/24/2009 04:08 PM, Johannes Berg wrote:
> On Tue, 2009-11-24 at 12:34 +0200, Avi Kivity wrote:
>
>    
>> Um, C can be easily parsed with a C compiler.  I don't think you can
>> expect it to be a plain format string and argument list.
>>      
> Actually, it turns out that it cannot be parsed even with a C compiler:
>
> ({ const char *ret = p->buffer + p->len; static const char *access_str[]
> = { "---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux" }; union
> kvm_mmu_page_role role;
>
> ...
>
> userspace cannot possibly know from this what "union kvm_mmu_page_role"
> is.
>    

We can expose kvm_mmu_page_role, but that's a new can of worms.  And 
it's certainly not meant to be stable across kernel versions.

-- 
error compiling committee.c: too many arguments to function

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