linux-kernel - Re: kvmmmu tracing

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Date:	Tue, 24 Nov 2009 15:08:33 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Avi Kivity <avi@...hat.com>
Cc:	kvm <kvm@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: kvmmmu tracing

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.

johannes

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