linux-kernel - Re: [PATCH 2.6.32] ftrace: fix event format export

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Date:	Fri, 13 Nov 2009 14:29:26 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Andreas Schwab <schwab@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2.6.32] ftrace: fix event format export

On Fri, 2009-11-13 at 14:22 +0100, Andreas Schwab wrote:
> Johannes Berg <johannes@...solutions.net> writes:
> 
> > --- wireless-testing.orig/include/trace/ftrace.h	2009-11-13 13:15:21.000000000 +0100
> > +++ wireless-testing/include/trace/ftrace.h	2009-11-13 13:34:03.000000000 +0100
> > @@ -159,7 +159,7 @@
> >  #undef __get_str
> >  
> >  #undef TP_printk
> > -#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
> > +#define TP_printk(fmt, args...) "\"%s\", %s\n", fmt, __stringify(args)
> 
> Would using __stringify(fmt) work?  If there are double quote characters
> in fmt your solution would produce output that is ambiguous.

No, for say

#define FOO_FMT		"foo:%d"

and using
	FOO_FMT ", %d"
that would give
	""%s", %d"
instead of
	"%s, %d"

However, isn't it already ambiguous that way? I fail to see why %s, #fmt
would preserve inside " properly.

johannes

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