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Subject: Re: [RFC] [PATCH 2.6.37-rc5-tip 4/20]  4: uprobes: Adding and
 remove a uprobe in a rb tree.
From: Peter Zijlstra <peterz@infradead.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
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        Jim Keniston <jkenisto@linux.vnet.ibm.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
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        Andrew Morton <akpm@linux-foundation.org>,
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Date: Tue, 25 Jan 2011 14:56:13 +0100
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On Thu, 2010-12-16 at 15:28 +0530, Srikar Dronamraju wrote:
> +struct uprobe_consumer {
> +       int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs);
> +       /*
> +        * filter is optional; If a filter exists, handler is run
> +        * if and only if filter returns true.
> +        */
> +       bool (*filter)(struct uprobe_consumer *self, struct task_struct *task);
> +
> +       struct uprobe_consumer *next;
> +       void *fvalue;   /* filter value */
> +}; 

Since you pass in a pointer to this structure at register_uprobe() its
user allocated, hence you can remove the fvalue thing and let the user
embed this in a larger struct if needed, the filter functions can then
use container_of() to get at the larger data structure.