Re: [PATCH v2 1/2] tracing/events: make __string() more general

[Christoph Hellwig]

On Tue, May 26, 2009 at 12:04:28PM +0800, Li Zefan wrote:
> This changes __string(..., src) to __string(..., len), thus makes it more
> general, and then block TRACE_EVENT() can use it.
> 
> Also introduce __fetch_str(), which is used in TP_assign() and returns
> the address of the string, while __get_str() is used in TP_print().

If you want to make it really generaly dealing with NULL string pointers
would be extremly helpful.  I ran into that limitation (and the length
one fixed here) when converting the XFS tracing over.

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