linux-kernel - Re: [PATCH 2/4] tracing/filters: Fix MATCH_FULL filter matching for PTR

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Date:	Fri, 11 Dec 2009 13:07:55 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...e.hu>,
	Wenji Huang <wenji.huang@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] tracing/filters: Fix MATCH_FULL filter matching
	for PTR_STRING

On Fri, Dec 11, 2009 at 05:59:06PM +0800, Li Zefan wrote:
> MATCH_FULL matching for PTR_STRING is not working correctly:
> 
>   # echo 'func == vt' > events/bkl/lock_kernel/filter
>   # echo 1 > events/bkl/lock_kernel/enable
>   ...
>   # cat trace
>    Xorg-1484  [000]  1973.392586: lock_kernel: ... func=vt_ioctl()
>     gpm-1402  [001]  1974.027740: lock_kernel: ... func=vt_ioctl()
> 
> We should pass to regex.match(..., len) the length (including '\0')
> of the source string instead of the length of the pattern string.
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>


This patch is cool but it seems to also break middle and end
matching (at least what was working with end matching :)

I know you fix that in the subsequent patches, but please
avoid that. A fix should not bring another known bug,
event if it's fixed in the same batch.

Thanks.

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